THz spectroscopy has recently been used to examine human disease because of its a higher sensitivity and signal-to-noise ratio. In this work, the interaction mode between THZ radiation and biological tissue in the THz frequency range is given. Clinical Intralipid-10% is diluted into different concentrations to use as tissue phantoms. And they are firstly tested based on the terahertz time domain spectroscopy in the condition of room temperature. Optical parameters of phantom solution including absorption coefficient and refractive index are gotten, and the frequency properties of these optical parameters are analyzed. The function relations can be firstly found. The conclusions is meaningful to make the further research of interaction between THZ radiation and human tissue, related cancers.
{"title":"Analysis on the characteristics of biological tissues based on the terahertz time domain spectroscopy system","authors":"C. Liu, Er-Liang Cui, Wei Liu, P. Sun, Jia Li","doi":"10.1117/12.901048","DOIUrl":"https://doi.org/10.1117/12.901048","url":null,"abstract":"THz spectroscopy has recently been used to examine human disease because of its a higher sensitivity and signal-to-noise ratio. In this work, the interaction mode between THZ radiation and biological tissue in the THz frequency range is given. Clinical Intralipid-10% is diluted into different concentrations to use as tissue phantoms. And they are firstly tested based on the terahertz time domain spectroscopy in the condition of room temperature. Optical parameters of phantom solution including absorption coefficient and refractive index are gotten, and the frequency properties of these optical parameters are analyzed. The function relations can be firstly found. The conclusions is meaningful to make the further research of interaction between THZ radiation and human tissue, related cancers.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132975214","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}
CCD (Charge Coupled Device) is the most popular detector for camera to detect low levels of light for wavelengths from 300nm to 1100nm. Contemporary CCD has read noise level equivalent to a few electrons, and Well capacity over 100,000 electrons .In order to take full advantage of these characteristics, it needs the dynamic of ADC must exceed the dynamic of the CCD. That is the number of bits provided by the ADC must exceed 16 bits. While the high reliability and inexpensive 16-20 bit A/D converter is few. In this paper, we firstly analyze CCD noise and then present the principle to extend the dynamic of the CCD in signal processing chain using two low resolution ADC with different sensitivity. At last we present a concrete example of improving the resolution of the ADC is by tow parallel low resolution ADCS with developing software to suitably process the converted analog-to-digital signal to achieve the same effect as a higher resolution ADC.
{"title":"A practical method to extending dynamic range of CCD camera","authors":"Zhi Chen, Baotan Jiang, Bo Gao","doi":"10.1117/12.900007","DOIUrl":"https://doi.org/10.1117/12.900007","url":null,"abstract":"CCD (Charge Coupled Device) is the most popular detector for camera to detect low levels of light for wavelengths from 300nm to 1100nm. Contemporary CCD has read noise level equivalent to a few electrons, and Well capacity over 100,000 electrons .In order to take full advantage of these characteristics, it needs the dynamic of ADC must exceed the dynamic of the CCD. That is the number of bits provided by the ADC must exceed 16 bits. While the high reliability and inexpensive 16-20 bit A/D converter is few. In this paper, we firstly analyze CCD noise and then present the principle to extend the dynamic of the CCD in signal processing chain using two low resolution ADC with different sensitivity. At last we present a concrete example of improving the resolution of the ADC is by tow parallel low resolution ADCS with developing software to suitably process the converted analog-to-digital signal to achieve the same effect as a higher resolution ADC.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127954817","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 system for short-range millimetre wave(MMW) active imaging was developed, including transceiver antenna, scanning system, transceiver front-end, signal processing. A target within a few meters or even a few centimeters can be imaged. The overall structure of the imaging system and imaging method were researched. The short-range scattering imaging formula was derived from the spectral distribution shift view, which can simplify the method. Phase compensation factor was introduced to improve the imaging resolution. The relationship between the sampling frequency and scanning speed was analyzed to optimize the system parameters, which can improve image quality and system efficiency.
{"title":"Analysis on short-range millimetre wave scattering imaging system","authors":"Li Zhu, Xing-guo Li, Guo-wei Lou, Chao Zhang","doi":"10.1117/12.897512","DOIUrl":"https://doi.org/10.1117/12.897512","url":null,"abstract":"A system for short-range millimetre wave(MMW) active imaging was developed, including transceiver antenna, scanning system, transceiver front-end, signal processing. A target within a few meters or even a few centimeters can be imaged. The overall structure of the imaging system and imaging method were researched. The short-range scattering imaging formula was derived from the spectral distribution shift view, which can simplify the method. Phase compensation factor was introduced to improve the imaging resolution. The relationship between the sampling frequency and scanning speed was analyzed to optimize the system parameters, which can improve image quality and system efficiency.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126741767","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}
Among kinds of ways to improve the early-warning of a country, identifying the space object material in a better and faster way is an important and effective method. The hyperspectral image, which is a 3-D data cube and contains the spatial and spectral information of the interest objects, will play a more important role in identifying the space object material. However, the low spatial resolution of the hyperspectral remote sensing instrument makes the single pixel spectrum often mixed up several different materials' spectra, which is called mixed pixel. So it is a considerable question to decompose the mixed pixels into spectra of pure materials (called endmembers) and get their corresponding fractions (called abundances). Since a hyperspectral image can be seen as a 3-D tensor, nonnegative tensor factorization (NTF) algorithm based on tensor analysis can be introduced into the field of hyperspectral unmixing. However, random initialization, a classical way to initialize the NTF algorithm, causes a slow rate of convergence, which can be improved through other methods to initialize this algorithm. This paper selects the vertex component analysis (VCA) algorithm to initialize the NTF algorithm. In this way, a faster and better result is obtained, and furthermore, four simulated hyperspectral images dataset of 3-D model of Hubble Space Telescope with different spatial resolutions are processed by the improved algorithm in this paper, and good results are obtained.
{"title":"Space object material identification of hyperspectral data using nonnegative tensor factorization","authors":"Chao Yang, Xiao-ming Cheng, Zhenwei Shi","doi":"10.1117/12.900482","DOIUrl":"https://doi.org/10.1117/12.900482","url":null,"abstract":"Among kinds of ways to improve the early-warning of a country, identifying the space object material in a better and faster way is an important and effective method. The hyperspectral image, which is a 3-D data cube and contains the spatial and spectral information of the interest objects, will play a more important role in identifying the space object material. However, the low spatial resolution of the hyperspectral remote sensing instrument makes the single pixel spectrum often mixed up several different materials' spectra, which is called mixed pixel. So it is a considerable question to decompose the mixed pixels into spectra of pure materials (called endmembers) and get their corresponding fractions (called abundances). Since a hyperspectral image can be seen as a 3-D tensor, nonnegative tensor factorization (NTF) algorithm based on tensor analysis can be introduced into the field of hyperspectral unmixing. However, random initialization, a classical way to initialize the NTF algorithm, causes a slow rate of convergence, which can be improved through other methods to initialize this algorithm. This paper selects the vertex component analysis (VCA) algorithm to initialize the NTF algorithm. In this way, a faster and better result is obtained, and furthermore, four simulated hyperspectral images dataset of 3-D model of Hubble Space Telescope with different spatial resolutions are processed by the improved algorithm in this paper, and good results are obtained.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123317596","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 novel measuring system, named Theodolite-camera Videometrics System (TVS) based on total station, has been introduced in this paper, and the concept of theodolite-camera which is the key component of TVS has been proposed, it consists of non-metric camera and rotation platform generally, and can rotate horizontally and vertically. TVS based on total station is free of field control points, and the fields of view of its theodolite-cameras are nonfixed, thus TVS is qualified for targets with wide moving range or big structure. Theodolite-camera model has been analyzed and presented in detail in this paper. The calibration strategy adopted has been demonstrated to be accurate and feasible by both simulated and real data, and TVS has also been proved to be a valid, reliable, precise measuring system, and living up to expectations.
{"title":"Theodolite-camera videometrics system based on total station","authors":"Zhaokun Zhu, Yun Yuan, Xiaohu Zhang","doi":"10.1117/12.900859","DOIUrl":"https://doi.org/10.1117/12.900859","url":null,"abstract":"A novel measuring system, named Theodolite-camera Videometrics System (TVS) based on total station, has been introduced in this paper, and the concept of theodolite-camera which is the key component of TVS has been proposed, it consists of non-metric camera and rotation platform generally, and can rotate horizontally and vertically. TVS based on total station is free of field control points, and the fields of view of its theodolite-cameras are nonfixed, thus TVS is qualified for targets with wide moving range or big structure. Theodolite-camera model has been analyzed and presented in detail in this paper. The calibration strategy adopted has been demonstrated to be accurate and feasible by both simulated and real data, and TVS has also been proved to be a valid, reliable, precise measuring system, and living up to expectations.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126230719","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 ringing effect often occurs in restored images, and its typical feature is that there are Gibbs-like oscillations in the neighboring areas of an image with sharp gray scale variations. The existence of the ringing effect causes it to be difficult for the restored images to be subsequently processed and some image quality evaluation methods to be invalid. In this paper, we studied several image restoration methods for diffraction-degraded remote sensing image: a Wiener filtering algorithm that is a simple and rapid image restoration algorithm, which is especially suitable for images without noise and with accurate PSF estimation and a small degree of blurring; an RL (Richardson-Lucy) algorithm that can gradually improve the image definition with an increase in iterations but the ringing effect becomes more and more significant; and a TV (total variation) algorithm that is a normalization algorithm based on noise and ringing suppression. We used multiple parameters to evaluate the restored images, including BDQ (block difference quality), GMG (gray mean grads), LS (Laplacian operator sum), and LE (large entropy), for which reference image are not required, as well as PSNR (peak signal noise ratio), SSIM (structural similarity), GRM(Gradient Ringing Metric) and HVSWGM (weighted gradient metric based on human visual system), for which reference image are required. The results show that the HVSWGM method is insensitive to the ringing effect occurring in image restoration and the evaluation result is completely consistent with a subjective evaluation result with a human visual system, and that many non-reference methods fail completely in assessing restored image with ringing effect, and only BDQ method is able to conform to subjective evaluation method to some extent.
{"title":"Analysis of image restoration and evaluation for diffraction-degraded remote sensing image","authors":"Qi Li, Zhi-hai Xu, H. Feng, X. Tao, Ju-feng Zhao","doi":"10.1117/12.897423","DOIUrl":"https://doi.org/10.1117/12.897423","url":null,"abstract":"A ringing effect often occurs in restored images, and its typical feature is that there are Gibbs-like oscillations in the neighboring areas of an image with sharp gray scale variations. The existence of the ringing effect causes it to be difficult for the restored images to be subsequently processed and some image quality evaluation methods to be invalid. In this paper, we studied several image restoration methods for diffraction-degraded remote sensing image: a Wiener filtering algorithm that is a simple and rapid image restoration algorithm, which is especially suitable for images without noise and with accurate PSF estimation and a small degree of blurring; an RL (Richardson-Lucy) algorithm that can gradually improve the image definition with an increase in iterations but the ringing effect becomes more and more significant; and a TV (total variation) algorithm that is a normalization algorithm based on noise and ringing suppression. We used multiple parameters to evaluate the restored images, including BDQ (block difference quality), GMG (gray mean grads), LS (Laplacian operator sum), and LE (large entropy), for which reference image are not required, as well as PSNR (peak signal noise ratio), SSIM (structural similarity), GRM(Gradient Ringing Metric) and HVSWGM (weighted gradient metric based on human visual system), for which reference image are required. The results show that the HVSWGM method is insensitive to the ringing effect occurring in image restoration and the evaluation result is completely consistent with a subjective evaluation result with a human visual system, and that many non-reference methods fail completely in assessing restored image with ringing effect, and only BDQ method is able to conform to subjective evaluation method to some extent.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126508275","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 blade is a key component of the aero-engine. As the blade must have a precise size, accurate shape, the three-dimensional profiling measurement of the blade is very important. Its complexity and diversity bring considerable difficulty to the measurement. The optical triangulation method is used in the profiling measurement of the blade in the paper. The coded technique based on gray-code combined with the phase-shift method is used. The three-dimensional point cloud of blade is obtained in this method. A high accuracy of three-dimensional profiling measurement of the blade is achieved, and the measurement accuracy reaches 0.05 mm.
{"title":"The three-dimensional measurement research of aero-engine blade based on structured light","authors":"Yanjun Fu, M. Wan","doi":"10.1117/12.899376","DOIUrl":"https://doi.org/10.1117/12.899376","url":null,"abstract":"The blade is a key component of the aero-engine. As the blade must have a precise size, accurate shape, the three-dimensional profiling measurement of the blade is very important. Its complexity and diversity bring considerable difficulty to the measurement. The optical triangulation method is used in the profiling measurement of the blade in the paper. The coded technique based on gray-code combined with the phase-shift method is used. The three-dimensional point cloud of blade is obtained in this method. A high accuracy of three-dimensional profiling measurement of the blade is achieved, and the measurement accuracy reaches 0.05 mm.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121506238","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}
Non-touch measurement is an important technology in many domains such as the monitoring of tool breakage and tool wear, et al. Based on the method of curve fitting and demanding inflection point, we present a high accuracy non-touch diameter measurement system. The measurement system comprise linear array CCD, CCD driving circuit, power supply, workseat, light source, data acquisition card and so on. The picture element of the linear array CCD is 2048, and the size of every pixel and the spacing of adjacent pixels have the same size of 14μmx14μm. The stabilized voltage supply has a constant voltage output of 3V. The light is generated by a halogen tungsten lamp, which does not represent any risk to the health of the whole system. The data acquisition card converts the analog signal to digital signal with the accuracy of 12 bit. The error of non-uniform of the CCD pixels in sensitivity and the electrical noise error are indicated in detail. The measurement system has a simple structure, high measuring precision, and can be carried out automatically. Experiment proves that the diameter measurement of the system is within the range of Φ0.5~Φ10mm, and the total measuring unstability of the system is within the range of ± 1.4μm.
{"title":"Research on high accuracy diameter measurement system with CCD","authors":"Bo Su, Guoteng Duan","doi":"10.1117/12.900961","DOIUrl":"https://doi.org/10.1117/12.900961","url":null,"abstract":"Non-touch measurement is an important technology in many domains such as the monitoring of tool breakage and tool wear, et al. Based on the method of curve fitting and demanding inflection point, we present a high accuracy non-touch diameter measurement system. The measurement system comprise linear array CCD, CCD driving circuit, power supply, workseat, light source, data acquisition card and so on. The picture element of the linear array CCD is 2048, and the size of every pixel and the spacing of adjacent pixels have the same size of 14μmx14μm. The stabilized voltage supply has a constant voltage output of 3V. The light is generated by a halogen tungsten lamp, which does not represent any risk to the health of the whole system. The data acquisition card converts the analog signal to digital signal with the accuracy of 12 bit. The error of non-uniform of the CCD pixels in sensitivity and the electrical noise error are indicated in detail. The measurement system has a simple structure, high measuring precision, and can be carried out automatically. Experiment proves that the diameter measurement of the system is within the range of Φ0.5~Φ10mm, and the total measuring unstability of the system is within the range of ± 1.4μm.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"63 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120943067","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}
J. Anthony, R. Leonhardt, A. Argyros, S. Leon-Saval
We report measurements for hollow core kagome microstructured Terahertz (THz) fiber characterized with the THz-time domain spectroscopy (THz-TDS). To achieve good mode overlap between the input beam and the fiber mode distribution, we incorporate specially designed THz lenses in our experimental setup. The experimental observations show that only the fundamental mode is guided in the fiber core. The time domain scans and their spectral information show air-guidance over a large frequency range from 0.6 to at least 1.1 THz. Within this frequency bandwidth, low transmission amplitudes at certain frequencies are identified as the frequency cut-offs for the kagome structure is observed. The measured transmission of the kagome fibers shows the characteristics of the inhibited coupling mechanism. We estimate high coupling efficiencies, as high as 60%, have been achieved in our experiments.
{"title":"Single mode propagation through a terahertz kagome microstructured fiber","authors":"J. Anthony, R. Leonhardt, A. Argyros, S. Leon-Saval","doi":"10.1117/12.900529","DOIUrl":"https://doi.org/10.1117/12.900529","url":null,"abstract":"We report measurements for hollow core kagome microstructured Terahertz (THz) fiber characterized with the THz-time domain spectroscopy (THz-TDS). To achieve good mode overlap between the input beam and the fiber mode distribution, we incorporate specially designed THz lenses in our experimental setup. The experimental observations show that only the fundamental mode is guided in the fiber core. The time domain scans and their spectral information show air-guidance over a large frequency range from 0.6 to at least 1.1 THz. Within this frequency bandwidth, low transmission amplitudes at certain frequencies are identified as the frequency cut-offs for the kagome structure is observed. The measured transmission of the kagome fibers shows the characteristics of the inhibited coupling mechanism. We estimate high coupling efficiencies, as high as 60%, have been achieved in our experiments.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123855282","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, we have determined water-ethanol mixtures and Chinese spirit with terahertz time-domain transmission spectroscopy (THz-TDS). Eleven samples of water-ethanol mixtures with varying alcohol degree from 0% to 100% (v/v), increased in 10%-steps, were used as the calibration set. Several Chinese spirit samples were used as the prediction set. We measured alcohol degree by alcohol meter, with measurement accuracy of 0.2% (v/v). Partial least square (PLS) model was employed for regression. The refractive index, absorption coefficient and mixed models by PLS regression together with alcohol degree were established, respectively. The predictive values of alcohol degree were very close to the reference values determined by alcohol meter. To assess the quality of the model, we calculated the correlation coefficient R-square, the root mean square errors of the calibration set (RMSEC) and the prediction set (RMSEP) of the three models. The results show that the absorption coefficient PLS regression model is the best method for determining alcohol degree of Chinese spirit with THz-TDS transmission measurement.
{"title":"Determination of alcohol degree in Chinese spirit with terahertz time-domain transmission spectroscopy","authors":"Changsheng Guo, Jianjun Liu, Zhi Hong","doi":"10.1117/12.900667","DOIUrl":"https://doi.org/10.1117/12.900667","url":null,"abstract":"In this paper, we have determined water-ethanol mixtures and Chinese spirit with terahertz time-domain transmission spectroscopy (THz-TDS). Eleven samples of water-ethanol mixtures with varying alcohol degree from 0% to 100% (v/v), increased in 10%-steps, were used as the calibration set. Several Chinese spirit samples were used as the prediction set. We measured alcohol degree by alcohol meter, with measurement accuracy of 0.2% (v/v). Partial least square (PLS) model was employed for regression. The refractive index, absorption coefficient and mixed models by PLS regression together with alcohol degree were established, respectively. The predictive values of alcohol degree were very close to the reference values determined by alcohol meter. To assess the quality of the model, we calculated the correlation coefficient R-square, the root mean square errors of the calibration set (RMSEC) and the prediction set (RMSEP) of the three models. The results show that the absorption coefficient PLS regression model is the best method for determining alcohol degree of Chinese spirit with THz-TDS transmission measurement.","PeriodicalId":355017,"journal":{"name":"Photoelectronic Detection and Imaging","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131219758","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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