Shengyang Zhou, C. Cai, Ying Wang, Zhihua Liu, Ming Yang
Advanced low frequency vibration calibration is imperative required as the wide applications of low frequency accelerometers. Low frequency calibration is commonly realized by the Earth’s gravity method or the laser interferometry. However, affected by the limited stroke of the standard vibration shaker, the calibration precision of laser interferometry at very low frequency is usually not ideal. Although the Earth’s gravity method can avoid this low calibration precision at very low frequency, its calibration frequency usually <5 Hz due to the influence of rotator centripetal acceleration. In this paper, the Earth’s gravity method mentioned in ISO 16063-16 is improved by using an effective image feature detection method. This method detects the angel between Earth’s gravity field direction and acceleration sensitivity axis direction to improve the Earth’s gravity static calibration accuracy.
{"title":"A novel Earth’s gravity method for accelerometer calibration","authors":"Shengyang Zhou, C. Cai, Ying Wang, Zhihua Liu, Ming Yang","doi":"10.1117/12.2511921","DOIUrl":"https://doi.org/10.1117/12.2511921","url":null,"abstract":"Advanced low frequency vibration calibration is imperative required as the wide applications of low frequency accelerometers. Low frequency calibration is commonly realized by the Earth’s gravity method or the laser interferometry. However, affected by the limited stroke of the standard vibration shaker, the calibration precision of laser interferometry at very low frequency is usually not ideal. Although the Earth’s gravity method can avoid this low calibration precision at very low frequency, its calibration frequency usually <5 Hz due to the influence of rotator centripetal acceleration. In this paper, the Earth’s gravity method mentioned in ISO 16063-16 is improved by using an effective image feature detection method. This method detects the angel between Earth’s gravity field direction and acceleration sensitivity axis direction to improve the Earth’s gravity static calibration accuracy.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130949569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on the principle of orthogonal demodulation, a Pound-Drever-Hall laser frequency locking scheme is developed. In the orthogonal demodulation Pound-Drever-Hall system, three sine signals are generated simultaneously using a direct digital synthesizer. A 0° phase sine signal is used to drive an electro-optic modulator to produce the phase sidebands, and 180° and 270° phase sine signals are used as reference signals for phase demodulation. The phase-modulated laser beam is coupled with a reference Fabry–Pérot cavity, and the reflected beam is sent into a photo-detector, whose output is mixed with two orthogonal reference signals to obtain two orthogonal components of the error signal. Using an analogto- digital converter, the two orthogonal components are processed using orthogonal phase sensitive detection to obtain the error signal on a host computer. The Pound-Drever-Hall laser frequency discrimination and tracking system is established and investigated experimentally using the orthogonal demodulation method. A frequency discrimination curve is obtained, and it is observed that the resonant frequency of the Fabry–Pérot cavity can automatically track laser frequency variation.
{"title":"Laser frequency locking system using orthogonally demodulated Pound–Drever–Hall method","authors":"Juan Su, Mingxing Jiao, Fei Jiang, Junhong Xing","doi":"10.1117/12.2510863","DOIUrl":"https://doi.org/10.1117/12.2510863","url":null,"abstract":"Based on the principle of orthogonal demodulation, a Pound-Drever-Hall laser frequency locking scheme is developed. In the orthogonal demodulation Pound-Drever-Hall system, three sine signals are generated simultaneously using a direct digital synthesizer. A 0° phase sine signal is used to drive an electro-optic modulator to produce the phase sidebands, and 180° and 270° phase sine signals are used as reference signals for phase demodulation. The phase-modulated laser beam is coupled with a reference Fabry–Pérot cavity, and the reflected beam is sent into a photo-detector, whose output is mixed with two orthogonal reference signals to obtain two orthogonal components of the error signal. Using an analogto- digital converter, the two orthogonal components are processed using orthogonal phase sensitive detection to obtain the error signal on a host computer. The Pound-Drever-Hall laser frequency discrimination and tracking system is established and investigated experimentally using the orthogonal demodulation method. A frequency discrimination curve is obtained, and it is observed that the resonant frequency of the Fabry–Pérot cavity can automatically track laser frequency variation.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121166211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high rotational speed standard device based on brushless DC coreless micro motor and FPGA technology for highaccuracy rotational speed control was investigated and established, with resolution of 1 r/min in the measurement range of 40000 r/min to 100000 r/min. The expanded calibration uncertainty of this standard device is 1×10-5, k=3 The structure of the device and key technology involved were described．The dual closed-loop control solution was explained. The calibration results were provided．This high rotational speed standard device is used as an important working standard for the feasible traceability of high-precision optical tachometers and rotational speed measuring instruments at measurement range above 40000 r/min.
{"title":"Establishment of standard device for high rotational speed generation","authors":"Qiao Sun, J. Bai, L. Du, Z. Fan, Hong-Bo Hu","doi":"10.1117/12.2517180","DOIUrl":"https://doi.org/10.1117/12.2517180","url":null,"abstract":"The high rotational speed standard device based on brushless DC coreless micro motor and FPGA technology for highaccuracy rotational speed control was investigated and established, with resolution of 1 r/min in the measurement range of 40000 r/min to 100000 r/min. The expanded calibration uncertainty of this standard device is 1×10-5, k=3 The structure of the device and key technology involved were described．The dual closed-loop control solution was explained. The calibration results were provided．This high rotational speed standard device is used as an important working standard for the feasible traceability of high-precision optical tachometers and rotational speed measuring instruments at measurement range above 40000 r/min.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122637775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhigang Wang, Chi Xiao, Yinming Zhao, Yongqian Li, Zili Zhou
The strain transfer characteristics of resistance strain-type transducer were theoretically investigated. A resistance straintype transducer was modeled to be a four-layer and two-glue (FLTG) structure model, which comprises successively an elastomer, a ground adhesive, a substrate layer, an upper adhesive, a sensitive grids layer, and a polymer cover. The strain transfer progress in a resistance strain-type transducer was described by the FLTG structure model. The strain transitional zone (STZ) was defined and the strain transfer ratio (STR) of the FLTG structure was formulated. The dependence of the STR and STZ on both the structural sizes and material parameters were calculated. The results indicate that the ground adhesive (including its thickness, and shear modulus) have a greater influence on the strain transitional zone ratio and strain transitional zone. In order to ensure a higher sensitivity of the resistance strain-type transducer, the ground adhesive layer should be as thin as possible, while its shear modulus should be as large as possible. Selecting a ground adhesive with a large elasticity modulus can effectively reduce the influence of the thickness of the ground adhesive on the strain transfer ratio.
{"title":"Strain transfer characteristics of resistance strain-type transducer","authors":"Zhigang Wang, Chi Xiao, Yinming Zhao, Yongqian Li, Zili Zhou","doi":"10.1117/12.2511954","DOIUrl":"https://doi.org/10.1117/12.2511954","url":null,"abstract":"The strain transfer characteristics of resistance strain-type transducer were theoretically investigated. A resistance straintype transducer was modeled to be a four-layer and two-glue (FLTG) structure model, which comprises successively an elastomer, a ground adhesive, a substrate layer, an upper adhesive, a sensitive grids layer, and a polymer cover. The strain transfer progress in a resistance strain-type transducer was described by the FLTG structure model. The strain transitional zone (STZ) was defined and the strain transfer ratio (STR) of the FLTG structure was formulated. The dependence of the STR and STZ on both the structural sizes and material parameters were calculated. The results indicate that the ground adhesive (including its thickness, and shear modulus) have a greater influence on the strain transitional zone ratio and strain transitional zone. In order to ensure a higher sensitivity of the resistance strain-type transducer, the ground adhesive layer should be as thin as possible, while its shear modulus should be as large as possible. Selecting a ground adhesive with a large elasticity modulus can effectively reduce the influence of the thickness of the ground adhesive on the strain transfer ratio.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122882069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the establishment of measuring coordinate system for large gears measurement was studied and discussed. The solution based on gauge blocks was proposed and the scheme was devised. The mathematical model for the establishment of measuring coordinate system was deduced. The main factors that influence the establishment precision of measuring coordinate system were studied, such as the alignment error of the initial position of the blocks, the installation eccentricity error of the gauge blocks and the error caused by the tilt of the rotary table and the different working lengths of the gauge blocks. The experiments were carried out on C40 gear measurement center under the condition of constant temperature and humidity. The experimental results showed the establishment precision of R axis of the measuring coordinate system was higher than that of T axis of the measuring coordinate system. When the working lengths of the gauge blocks were within 300mm, the measuring coordinate precisions of R axis and T axis were less than 2.5 μ m and 4 μ m, respectively, which could meet the requirement of the medium precision large gears measurement.
{"title":"Establishment of measuring coordinate system for large gears measurement by using gauge blocks","authors":"S. Li, Zhongpeng Zheng, Linyan Wang","doi":"10.1117/12.2518100","DOIUrl":"https://doi.org/10.1117/12.2518100","url":null,"abstract":"In this paper, the establishment of measuring coordinate system for large gears measurement was studied and discussed. The solution based on gauge blocks was proposed and the scheme was devised. The mathematical model for the establishment of measuring coordinate system was deduced. The main factors that influence the establishment precision of measuring coordinate system were studied, such as the alignment error of the initial position of the blocks, the installation eccentricity error of the gauge blocks and the error caused by the tilt of the rotary table and the different working lengths of the gauge blocks. The experiments were carried out on C40 gear measurement center under the condition of constant temperature and humidity. The experimental results showed the establishment precision of R axis of the measuring coordinate system was higher than that of T axis of the measuring coordinate system. When the working lengths of the gauge blocks were within 300mm, the measuring coordinate precisions of R axis and T axis were less than 2.5 μ m and 4 μ m, respectively, which could meet the requirement of the medium precision large gears measurement.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128092474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hang Chen, Jian Wang, Yue Gao, Cheng-Chih Hsu, Peng Jin, Jie Lin
A novel two-dimensional reflective grating encoder is introduced. The optical encoder is developed by a binary amplitude reflective scale grating and a two-dimensional slit displacement sensor, which is fabricated by MEMS technology. Based on Talbot effort, the proposed method can achieve millimetric measurement with high accuracy, where the displacement difference within 0.1% and 0.2% for 1 mm and 20 mm measurement, respectively. By using the eight-segment data division program, the proposed method can easily distinguish 1 μm displacement measurement. Furthermore, in measurement speed tests, the proposed method can reach the movement speed about 5000 μm/s. The experimental results showed the proposed method can achieve high resolution, high speed and long-range measurement, which is potential in the industries and workshops application.
{"title":"Two-dimensional reflective optical encoder based on point source illuminated grating imaging","authors":"Hang Chen, Jian Wang, Yue Gao, Cheng-Chih Hsu, Peng Jin, Jie Lin","doi":"10.1117/12.2511441","DOIUrl":"https://doi.org/10.1117/12.2511441","url":null,"abstract":"A novel two-dimensional reflective grating encoder is introduced. The optical encoder is developed by a binary amplitude reflective scale grating and a two-dimensional slit displacement sensor, which is fabricated by MEMS technology. Based on Talbot effort, the proposed method can achieve millimetric measurement with high accuracy, where the displacement difference within 0.1% and 0.2% for 1 mm and 20 mm measurement, respectively. By using the eight-segment data division program, the proposed method can easily distinguish 1 μm displacement measurement. Furthermore, in measurement speed tests, the proposed method can reach the movement speed about 5000 μm/s. The experimental results showed the proposed method can achieve high resolution, high speed and long-range measurement, which is potential in the industries and workshops application.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133324671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carbon nanotube membrane (CNTM) has been employed as the counter electrode in a two-electrode voltammetric electronic tongue system. Owing to its large surface area, CNTM provides significant double layer capacitance at the solid/solution interface, and offer a constant potential during the electrochemical detection. In order to characterize the analytical possibilities of the electronic tongue system, hydrogen peroxide has been detected. Principal component analysis (PCA) is used for identification. From the PCA plots, the electronic tongue system by using CNTM counter electrode shows much better performance and more promising than the conventional voltammetric two-electrode electronic tongue system by using large surface stainless steel counter electrode.
{"title":"Using carbon nanotube membrane as counter electrode in voltammetric electronic tongue system","authors":"Yazhuo Li, Xiangdong Zhou","doi":"10.1117/12.2511144","DOIUrl":"https://doi.org/10.1117/12.2511144","url":null,"abstract":"Carbon nanotube membrane (CNTM) has been employed as the counter electrode in a two-electrode voltammetric electronic tongue system. Owing to its large surface area, CNTM provides significant double layer capacitance at the solid/solution interface, and offer a constant potential during the electrochemical detection. In order to characterize the analytical possibilities of the electronic tongue system, hydrogen peroxide has been detected. Principal component analysis (PCA) is used for identification. From the PCA plots, the electronic tongue system by using CNTM counter electrode shows much better performance and more promising than the conventional voltammetric two-electrode electronic tongue system by using large surface stainless steel counter electrode.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131786263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuxian Wang, D. Peng, Zhiyi Wu, Tianheng Zhang, Yangyang Wang
The magnetoresistance(MR) sensor has been successfully demonstrated in rotational speed and position detection, however, the uneven magnetic field or the installation eccentricity are all decrease the signal quality and influence the reliability of measurement. Therefore, this paper presents the theory of time grating in displacement calculation and proposes a reverse compensation method using multi-groups sensor to improve measurement performance. A pair of linear tunnel magnetorsistance (TMR) sensors are spatially displaced by 90° electrical and excited by sin or cos signals. Another pair of sensors is reversed and diametrically apart to the former. A compensated traveling wave is got whose phase is proportional to the displacement of rotation. The angle displacement is measured by counting the time pulses that serve as measurement standards. The effectiveness of the proposed scheme is verified through a prototype permanent magnet motor system. That shows the amplitude of the measurement error from 0.17° to 0.04°, which reduces 75% by the special arrangement of the multi-groups TMR sensor. Even though the magnetic sensor presented here uses TMR sensors, the proposed technique is suited without any modification for Hall and other MR sensors as well.
{"title":"Reverse compensation to the angle estimate error using multi-groups sensor","authors":"Shuxian Wang, D. Peng, Zhiyi Wu, Tianheng Zhang, Yangyang Wang","doi":"10.1117/12.2512411","DOIUrl":"https://doi.org/10.1117/12.2512411","url":null,"abstract":"The magnetoresistance(MR) sensor has been successfully demonstrated in rotational speed and position detection, however, the uneven magnetic field or the installation eccentricity are all decrease the signal quality and influence the reliability of measurement. Therefore, this paper presents the theory of time grating in displacement calculation and proposes a reverse compensation method using multi-groups sensor to improve measurement performance. A pair of linear tunnel magnetorsistance (TMR) sensors are spatially displaced by 90° electrical and excited by sin or cos signals. Another pair of sensors is reversed and diametrically apart to the former. A compensated traveling wave is got whose phase is proportional to the displacement of rotation. The angle displacement is measured by counting the time pulses that serve as measurement standards. The effectiveness of the proposed scheme is verified through a prototype permanent magnet motor system. That shows the amplitude of the measurement error from 0.17° to 0.04°, which reduces 75% by the special arrangement of the multi-groups TMR sensor. Even though the magnetic sensor presented here uses TMR sensors, the proposed technique is suited without any modification for Hall and other MR sensors as well.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133818534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to balance the high translation stiffness and low twist stiffness in an H-drive precision stage with a large span, a design method based on flexure hinges combination is proposed. Firstly, various stiffness requirements in different degrees of freedom (DOF) of an H-drive precision stage with a large span are analyzed. Secondly, half-cartwheel flexure hinges combination is applied to balance these stiffness requirements. Thirdly, based on the Timoshenko beam theory, stiffness matrices of a single flexure hinge and combined hinges are established. Then, various structural parameters of the flexure hinge are determined by analyzing their influence on two performance indicators, including stiffness and motion precision. After that, finite element method is applied to verify these theoretical results. Finally, a stiffness identification experiment and a modal analysis experiment are conducted to test the 2-DOF stiffness of a single half-cartwheel flexure hinge and the natural frequency of the H-drive precision stage. The maximum error of stiffness between theoretical, simulation and experimental results is 13.4%. The natural frequency is up to 176.563 Hz, which could satisfy the control bandwidth requirement of the H-drive precision stage.
{"title":"Design of flexure hinges in an H-drive precision stage with a large span","authors":"Shaokai Wang, Jinxin Hu, Changqi Li, Jiubin Tan","doi":"10.1117/12.2511968","DOIUrl":"https://doi.org/10.1117/12.2511968","url":null,"abstract":"In order to balance the high translation stiffness and low twist stiffness in an H-drive precision stage with a large span, a design method based on flexure hinges combination is proposed. Firstly, various stiffness requirements in different degrees of freedom (DOF) of an H-drive precision stage with a large span are analyzed. Secondly, half-cartwheel flexure hinges combination is applied to balance these stiffness requirements. Thirdly, based on the Timoshenko beam theory, stiffness matrices of a single flexure hinge and combined hinges are established. Then, various structural parameters of the flexure hinge are determined by analyzing their influence on two performance indicators, including stiffness and motion precision. After that, finite element method is applied to verify these theoretical results. Finally, a stiffness identification experiment and a modal analysis experiment are conducted to test the 2-DOF stiffness of a single half-cartwheel flexure hinge and the natural frequency of the H-drive precision stage. The maximum error of stiffness between theoretical, simulation and experimental results is 13.4%. The natural frequency is up to 176.563 Hz, which could satisfy the control bandwidth requirement of the H-drive precision stage.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"23 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133865160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A compact diffracting grating based laser wavemeter is constructed in this paper. Wavelength is the length unit of laser interferometers, it must be very accurate and stable during the length measurement. An air sensor, which is employed to correct the air refractive index through an empirical equation, is essential in laser interferometers. However, the empirical equation is suffered from indirect measurement, the correction accuracy is depended on the measurement accuracy of the air sensor. Slow response is other disadvantages of the empirical equation. Additional, the empirical equation is not applicable to correct the laser diode wavelength. Therefore, a direct measurement method of laser diode wavelength, based on the diffraction principle, is proposed and a compact, low-cost and simple wavemeter is constructed in this paper. Laser beam drift is recognized as one of critical error source in laser measurement. Therefore, a novel laser beam drift active compensation method is thus proposed in this study that integrates the functions of automatic type angle turning and PID controlled fine angle motion. After introducing the principles of wavelength measurement and laser beam drift compensation, the effectiveness of the wavemeter in real-time wavelength measurement is well verified by the experimental results.
{"title":"Construction of a compact laser wavemeter with compensation of laser beam drift","authors":"Yindi Cai, B. Feng, K. Fan","doi":"10.1117/12.2509514","DOIUrl":"https://doi.org/10.1117/12.2509514","url":null,"abstract":"A compact diffracting grating based laser wavemeter is constructed in this paper. Wavelength is the length unit of laser interferometers, it must be very accurate and stable during the length measurement. An air sensor, which is employed to correct the air refractive index through an empirical equation, is essential in laser interferometers. However, the empirical equation is suffered from indirect measurement, the correction accuracy is depended on the measurement accuracy of the air sensor. Slow response is other disadvantages of the empirical equation. Additional, the empirical equation is not applicable to correct the laser diode wavelength. Therefore, a direct measurement method of laser diode wavelength, based on the diffraction principle, is proposed and a compact, low-cost and simple wavemeter is constructed in this paper. Laser beam drift is recognized as one of critical error source in laser measurement. Therefore, a novel laser beam drift active compensation method is thus proposed in this study that integrates the functions of automatic type angle turning and PID controlled fine angle motion. After introducing the principles of wavelength measurement and laser beam drift compensation, the effectiveness of the wavemeter in real-time wavelength measurement is well verified by the experimental results.","PeriodicalId":115119,"journal":{"name":"International Symposium on Precision Engineering Measurement and Instrumentation","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115654095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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