WO2012027867A1 - Online spectrum analyzer for detecting diffuse reflection with ultraviolet (uv), visible and near infrared (nir) light - Google Patents
Online spectrum analyzer for detecting diffuse reflection with ultraviolet (uv), visible and near infrared (nir) light Download PDFInfo
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- WO2012027867A1 WO2012027867A1 PCT/CN2010/001602 CN2010001602W WO2012027867A1 WO 2012027867 A1 WO2012027867 A1 WO 2012027867A1 CN 2010001602 W CN2010001602 W CN 2010001602W WO 2012027867 A1 WO2012027867 A1 WO 2012027867A1
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- 238000001514 detection method Methods 0.000 claims abstract description 18
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- 238000004458 analytical method Methods 0.000 claims description 22
- 238000000985 reflectance spectrum Methods 0.000 claims description 11
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
Definitions
- the invention relates to an ultraviolet, visible and near infrared on-line detection diffuse reflectance spectrum analyzer for the analysis of liquid, solid and high light scattering liquids.
- Spectroscopic instruments are instruments for spectroscopy and material spectroscopy. They are widely used in various optical detection and biochemical analysis by measuring the spectrum of light, measuring the optical properties of materials and identifying the composition of materials. , industrial automation testing, astronomical research and other fields.
- UV Ultraviolet
- UV refers to electromagnetic waves with a wavelength in the range of 185 to 400 nm, which cannot be perceived by the human eye. Because the electronic spectrum of most molecules is in the ultraviolet region, and the electronic spectrum of the molecule can basically determine the chemical reaction of the molecule, the molecular spectroscopy can be used to perform molecular qualitative analysis, quantitative analysis, structural analysis, and molecular chemical reactions. Spectral technology work.
- Visible refers to electromagnetic waves with a wavelength in the range of 380 to 780 nm, which can be perceived by the human eye. Visible light is the most widely used band and is closely related to people's lives. With visible light, analysis of light components, measurement and calculation of color, measurement of material properties, and molecular spectral analysis can be achieved.
- NIR Near Infrared
- VIS visible light
- MIR mid-infrared light
- VIS visible light
- MIR mid-infrared light
- the frequency doubling and combined frequency absorption signals of the material in this spectral region are weak, the bands overlap, and the analysis is complicated.
- the near-infrared spectrum “sleeps" for nearly one and a half centuries. It was only in the 1950s that near-infrared spectroscopy was applied to the analysis of agricultural and sideline products. In the 1950s, the near-infrared (NIR) spectrometer used a lead sulfide photoresistor as a detector. The wavelength range was up to 3000 nm for quantification. Analysis, but due to the low resolution of near-infrared light (NIR) extinction coefficient and spectral bandwidth, this technique has not been widely used. In the 1960s, diffuse reflectance technology was used to study the moisture, protein and fat content of wheat, and found near-infrared.
- NIR near-infrared
- NIR near-infrared
- NIR near-infrared
- NIR spectroscopy Due to the good transmission characteristics of near-infrared light in conventional optical fibers, NIR spectroscopy has also been well applied in the field of online analysis, and has achieved good social and economic benefits. From then on, near-infrared spectroscopy technology has entered a rapidly developing In the new era, modern near-infrared spectroscopy (NIR) analysis technology is a high-tech analytical technology that has developed rapidly in the field of analytical chemistry in recent years. It has attracted more and more attention from domestic and foreign analytical experts. It is known as the analysis of "giant" in the field of analytical chemistry. There is a revolution that can be said to bring another analytical technique.
- NIR near-infrared spectroscopy
- the object of the present invention is to overcome the above deficiencies, and to provide an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer with wide application fields and accurate measurement.
- an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer comprising a housing, an illumination system, a probe, an optical spectroscopic system, a signal acquisition system, and a housing inside the housing
- the calibration system and the spectral processing system, the illumination system, the signal acquisition system, the calibration system, and the spectral processing system are connected together with a power supply system, and the illumination system is used to emit ultraviolet, visible, and near-infrared light, illuminate the object to be measured, and the probe is used. Collecting the diffused light of the measured object and transmitting the collected light to the optical splitting system.
- the optical splitting system uses the grating to split the light into different wavelengths of light, and the signal acquisition system converts the optical signal into a digital signal and collects the light. By correcting the corrected spectrum of the system, it is processed, analyzed and displayed by the spectral processing system to determine the detection result.
- a further improvement of the present invention is that the probe includes a scope and an optical fiber, and the scope of the probe is used to expand the lighting area to allow more light to enter the spectroscopic system, and the optical fiber is used to transmit the optical signal.
- a further improvement of the present invention resides in that: the main component of the optical splitting system is a grating, and the optical splitting system uses light splitting of the grating to disperse light into light of different wavelengths.
- the signal acquisition system comprises a receiving unit, an amplifying unit and an collecting unit
- the receiving unit is configured to transmit the weak electrical signal converted into the received optical signal to the amplifying unit
- the amplifying unit is configured to receive the receiving unit
- the transmitted weak electrical signal is amplified to the extent that it can be acquired, and the acquisition unit is used to convert an electrical signal that is not recognized by the computer, that is, an analog signal, into a digital signal that can be recognized by the computer.
- the correction system includes a distance sensor for measuring the distance between the object to be measured and the temperature sensor, and a temperature sensor for measuring the temperature of the object to be measured.
- the one-step improvement of the present invention is: the spectral processing system includes a processing module and an analysis module, and the processing module includes a pre-processing section for pre-processing the acquired spectral signal to reduce high-frequency noise in the spectrum and improve The digital low-pass filter with spectral signal-to-noise ratio, because the distance and temperature of the measured object will affect the reflected light intensity, the distance and temperature signals obtained by the correction system are substituted into the relationship between the distance and temperature obtained by the prior experiment on the light intensity.
- the analysis module includes a mathematical model of a function part obtained by a large number of preliminary tests for a certain substance, and the preprocessed spectral signal is passed. After the model is calculated, the content of a specific substance can be obtained.
- a further improvement of the present invention is that: the light source is irradiated onto the object to be measured, and after the light interacts with the object to be measured, the diffuse reflection light is generated, collected by the probe in the probe and transmitted through the optical fiber in the probe, by the optical After the spectroscopic system splits the light, it is collected by the signal acquisition system, and the spectrum corrected by the calibration system is sent to the spectral processing system for qualitative and quantitative analysis of the spectral processing, thereby determining the detection result.
- the invention has the following advantages: wide application field, accurate measurement, and can be used for measurement in various industries.
- Figure 1 is a schematic structural view of the present invention
- the present invention shows an embodiment of an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer, the spectrum analyzer comprising a housing, an illumination system, a probe, an optical spectroscopic system, and a signal acquisition system , calibration systems and spectral processing systems, lighting systems, signal acquisition systems
- the system, the calibration system and the spectral processing system are connected to a power supply system.
- the illumination system is used to emit ultraviolet, visible, and near-infrared light, illuminate the object to be measured, and the probe is used to collect the light after the object is diffusely reflected, and will collect The latter light is transmitted to the optical splitting system.
- the optical splitting system uses the grating to split the light into different wavelengths of light, converts the optical signal into a digital signal through a signal acquisition system, and performs acquisition, and corrects the corrected spectrum of the system and gives it to the spectral processing.
- the system processes, analyzes, and displays to determine the test results, and the measurement range is wide.
- the probe includes a probe and an optical fiber. The probe is used to expand the light-recovering area to allow more light to enter the spectroscopic system.
- the optical fiber is used to transmit optical signals.
- the main component of the spectroscopic system is a grating.
- the optical spectroscopic system uses the spectroscopic action of the grating to disperse the light into different wavelengths of light.
- the signal acquisition system comprises a receiving unit, an amplifying unit and an acquisition unit, and the receiving unit is configured to convert the received optical signal into Weak electrical signal is transmitted to the amplification list
- the amplifying unit is configured to amplify the weak electrical signal sent by the receiving unit to a degree that can be collected, and the collecting unit converts the electrical signal that the computer cannot recognize, that is, the analog signal into a digital signal that can be recognized by the computer
- the calibration system includes the distance sensor and the temperature.
- the sensor, the distance sensor is used to measure the distance between the measured object and the probe, the temperature sensor is used to measure the temperature of the measured object,
- the spectral processing system comprises a processing module and an analysis module, and the processing module comprises a pre-preparation of the acquired spectral signal.
- the pre-processing part of the processing the digital low-pass filter used to reduce the high-frequency noise in the spectrum and improve the spectral signal-to-noise ratio. Since the distance and temperature of the measured object affect the reflected light intensity, the distance obtained by the correction system is The temperature signal is substituted into the function part of the relationship between the distance and temperature obtained by the prior experiment on the light intensity, to reduce the influence of the distance and temperature change on the reflected light intensity, and the analysis module includes a large amount of The function part obtained in the previous experiment is the mathematical model, which will preprocess the light. After the spectrum signal is calculated by the model, the content of the specific substance can be obtained, and the content of the specific substance can be obtained.
- the near-infrared spectrum is an indirect analysis technique, and the mathematical model must be established to realize the identification of the unknown sample.
- quantitative analysis mainly through the following Steps: First select a representative sample and measure its near-infrared spectrum, use standard or approved reference methods to determine the component or property data of interest, and use the appropriate stoichiometry to establish a mathematical model using the measured spectra and basic data.
- the analyzer of the present invention is irradiated onto the object to be measured by the light source, and the light interacts with the object to be measured to generate diffuse light, which is reflected by the probe.
- Collecting and transmitting through the optical fiber in the probe after being split by the optical spectroscopic system, collecting by the signal acquisition system, correcting the corrected spectrum of the system, and handing it to the spectral processing system for qualitative and quantitative analysis of the spectral processing, thereby determining Test results
- the oil in the petrochemical field, the oil can be measured Value, family composition, hexadecimal value, flash point, freezing point, freezing point, distillation range, MTBE content, etc.
- the protein, sugar, fat, fiber, moisture content, etc. of the grain can be determined, and the medicine can be determined in the medicine field.
- the active ingredient, composition and content can also be used to identify the type of sample, such as the true and false identification of alcohol and perfume, the classification of environmental waste, etc., the analysis of this ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
An online spectrum analyzer for detecting diffuse reflection with UV, visible and NIR light includes a housing, inside which an illuminating system, a probe, an optical splitting system, a signal acquiring system, a calibrating system and a spectrum processing system are provided. The illuminating system, the signal acquiring system, the calibrating system and the spectrum processing system are all together connected to a power supply system. The illuminating system is used to emit the light rays of UV, visible and NIR waveband to illuminate the detected object. The probe is used to collect the light rays diffuse-reflected by the detected object, and transmit the collected light rays to the optical splitting system. The light rays are split by a grating to form light rays with different wavebands. The signal acquiring system converts the optical signal into digital signal and collects the digital signal. The spectrum calibrated by the calibrating system is sent to the spectrum processing system to be processed, analyzed and displayed so that the detection result is determined.
Description
紫外、 可见、 近红外在线检测漫反射光谱分析仪 技术领域: Ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectroscopy
本发明涉及一种紫外、 可见、 近红外在线检测漫反射光谱分析仪, 用于 液体、 固体和高光散射的液体的分析。 The invention relates to an ultraviolet, visible and near infrared on-line detection diffuse reflectance spectrum analyzer for the analysis of liquid, solid and high light scattering liquids.
背景技术: Background technique:
光谱仪器是进行光谱学研究和物质光谱分析的仪器, 通过对光谱的测量 来完成光成分的分析、材料光学属性的测量以及物质成分的鉴定, 被广泛的 应用于各种光学检测、 生物化学分析、 工业自动化检测、 天文研究等领域。 Spectroscopic instruments are instruments for spectroscopy and material spectroscopy. They are widely used in various optical detection and biochemical analysis by measuring the spectrum of light, measuring the optical properties of materials and identifying the composition of materials. , industrial automation testing, astronomical research and other fields.
紫外光 (Ultraviolet, UV) 是指波长在 185〜400nm范围内的电磁波, 不可被人眼感知。 因为大多数分子的电子光谱处于紫外区域, 而分子的电子 光谱基本上能决定物质的化学反应,所以利用分子的电子光谱可以进行分子 定性分析、定量分析、结构分析和分子化学反应等有关的分子光谱技术工作。 Ultraviolet (UV) refers to electromagnetic waves with a wavelength in the range of 185 to 400 nm, which cannot be perceived by the human eye. Because the electronic spectrum of most molecules is in the ultraviolet region, and the electronic spectrum of the molecule can basically determine the chemical reaction of the molecule, the molecular spectroscopy can be used to perform molecular qualitative analysis, quantitative analysis, structural analysis, and molecular chemical reactions. Spectral technology work.
可见光 (Visible, VIS) 是指波长在 380〜780nm范围内的电磁波, 可 以被人眼感知。 可见光是应用最为广泛的波段, 与人们的生活密切联系。 利 用可见光, 可以实现对光成分的分析、 颜色的测量和计算、 材料属性的测量 和分子光谱分析等。 Visible (VIS) refers to electromagnetic waves with a wavelength in the range of 380 to 780 nm, which can be perceived by the human eye. Visible light is the most widely used band and is closely related to people's lives. With visible light, analysis of light components, measurement and calculation of color, measurement of material properties, and molecular spectral analysis can be achieved.
近红外光(Near Infrared, NIR)是介于可见光(VIS)和中红外光(MIR) 之间的电磁波, 即: 波长在 780〜2500nm范围内的电磁波, 不可被人眼感 知。***限制, 近红外光谱 "沉睡" 了近一个半世纪, 直
到 20世纪 50年代, 才开始将近红外光谱技术应用在农副产品分析中, 50 年代的商品近红外光 (NIR)光谱仪使用硫化铅光敏电阻作检测器, .其波长 围可至 3000nm, 用于定量分析, 但由于近红外光 (NIR)消光系数低和谱带宽 而解析困难, 该技术并没有获得广泛应用, 60年代, 开始使用漫反射技术对 麦子水分、 蛋白和脂肪含量进行研究, 发现近红外光 (NIR)光谱用于常规分 析的实用价值。 随着计算机发展和化学计量学的诞生, 近红外光 (NIR)和化 学计量学结合产生了现代近红外光 (NIR)光谱学。近红外光 (NIR)最先应用于 农业领域。 到 60年代中后期, 随着各种新的分析技术的出现, 加之经典近 红外光谱分析技术暴露出的灵敏度低、抗干扰性差的弱点, 使人们淡漠了该 技术在分析测试中的应用, 从此, 近红外光谱进入了一个沉默的时期。 80 年代后期, 随着计算机技术的迅速发展, 带动了分析仪器的数字化和化学计 量学的发展,通过化学计量学方法在解决光谱信息提取和背景干扰方面取得 的良好效果, 加之近红外光谱在测样技术上所独有的特点, 使人们重新认识 了近红外光谱的价值,近红外光谱在各领域中的应用研究陆续展开。进入 90 年代, 近红外光谱在工业领域中的应用全面展开, 有关近红外光谱的研究及 应用文献几乎呈指数增长, 成为发展最快、最引人注目的一门独立的分析技 术。 由于近红外光在常规光纤中具有良好的传输特性, 使近红外光谱在在线 分析领域也得到了很好的应用, 并取得良好的社会效益和经济效益, 从此近 红外光谱技术进入一个快速发展的新时期, 现代近红外光谱 (NIR) 分析技 术是近年来分析化学领域迅猛发展的高新分析技术,越来越引起国内外分析 专家的注目, 在分析化学领域被誉为分析 "巨人", 它的出现可以说带来了 又一次分析技术的革命。 Near Infrared (NIR) is an electromagnetic wave between visible light (VIS) and mid-infrared light (MIR), that is, electromagnetic waves with a wavelength in the range of 780 to 2500 nm, which are not perceptible by the human eye. It is customary to divide the near-infrared region into near-infrared short-wave and near-infrared long-spectral regions; around 1900, near-infrared (NIR) spectroscopy instruments use glass prisms and film recorders, and their spectral range is limited to 700 nm-1600 nm. The frequency doubling and combined frequency absorption signals of the material in this spectral region are weak, the bands overlap, and the analysis is complicated. Due to the technical level at that time, the near-infrared spectrum "sleeps" for nearly one and a half centuries. It was only in the 1950s that near-infrared spectroscopy was applied to the analysis of agricultural and sideline products. In the 1950s, the near-infrared (NIR) spectrometer used a lead sulfide photoresistor as a detector. The wavelength range was up to 3000 nm for quantification. Analysis, but due to the low resolution of near-infrared light (NIR) extinction coefficient and spectral bandwidth, this technique has not been widely used. In the 1960s, diffuse reflectance technology was used to study the moisture, protein and fat content of wheat, and found near-infrared. The useful value of light (NIR) spectroscopy for routine analysis. With the development of computers and the birth of chemometrics, the combination of near-infrared light (NIR) and chemometrics has produced modern near-infrared (NIR) spectroscopy. Near-infrared light (NIR) was first used in agriculture. In the mid-to-late 60s, with the emergence of various new analytical techniques, coupled with the weak sensitivity and poor anti-interference weakness exposed by classical NIR spectroscopy, people have indifferent to the application of this technology in analytical testing. The near-infrared spectrum entered a period of silence. In the late 1980s, with the rapid development of computer technology, the development of digitization and chemometrics of analytical instruments, the good results achieved by chemometric methods in solving spectral information extraction and background interference, and the near-infrared spectroscopy were measured. The unique characteristics of the technology make people re-recognize the value of near-infrared spectroscopy, and the application research of near-infrared spectroscopy in various fields has been launched. In the 1990s, the application of near-infrared spectroscopy in the industrial field was fully developed. The research and application literature on near-infrared spectroscopy almost expanded exponentially, becoming the fastest growing and most compelling independent analysis technology. Due to the good transmission characteristics of near-infrared light in conventional optical fibers, NIR spectroscopy has also been well applied in the field of online analysis, and has achieved good social and economic benefits. From then on, near-infrared spectroscopy technology has entered a rapidly developing In the new era, modern near-infrared spectroscopy (NIR) analysis technology is a high-tech analytical technology that has developed rapidly in the field of analytical chemistry in recent years. It has attracted more and more attention from domestic and foreign analytical experts. It is known as the analysis of "giant" in the field of analytical chemistry. There is a revolution that can be said to bring another analytical technique.
发明内容:
本发明的目的是为了克服以上的不足, 提供一种应用领域广、 测量精确 的紫外、 可见、 近红外在线检测漫反射光谱分析仪。 Summary of the invention: The object of the present invention is to overcome the above deficiencies, and to provide an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer with wide application fields and accurate measurement.
本发明的目的通过以下技术方案来实现: 一种紫外、 可见、 近红外在线 检测漫反射光谱分析仪, 包括壳体, 在壳体内部设有照明***、 探头、 光学 分光***、 信号采集***、 校正***和光谱处理***, 照明***、 信号采集 ***、校正***和光谱处理***共同连接有供电***, 照明***用于发射紫 外、 可见、 近红外波段的光线, 照明被测物体, 所述探头用于收集被测物体 漫反射后的光线, 并将收集后的光线传送给光学分光***, 光学分光***利 用光栅将光线分光形成不同波长的光,信号采集***将光信号转换成数字信 号并进行采集, 通过校正***校正后的光谱, 交给光谱处理***处理、 分析 和显示, 从而确定检测结果。 The object of the present invention is achieved by the following technical solutions: an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer, comprising a housing, an illumination system, a probe, an optical spectroscopic system, a signal acquisition system, and a housing inside the housing, The calibration system and the spectral processing system, the illumination system, the signal acquisition system, the calibration system, and the spectral processing system are connected together with a power supply system, and the illumination system is used to emit ultraviolet, visible, and near-infrared light, illuminate the object to be measured, and the probe is used. Collecting the diffused light of the measured object and transmitting the collected light to the optical splitting system. The optical splitting system uses the grating to split the light into different wavelengths of light, and the signal acquisition system converts the optical signal into a digital signal and collects the light. By correcting the corrected spectrum of the system, it is processed, analyzed and displayed by the spectral processing system to determine the detection result.
本发明的进一步改进在于: 所述探头包括探镜和光纤, 探镜的作用是用 来扩大采光面积, 使更多的光线进入分光***, 光纤用来传输光信号。 A further improvement of the present invention is that the probe includes a scope and an optical fiber, and the scope of the probe is used to expand the lighting area to allow more light to enter the spectroscopic system, and the optical fiber is used to transmit the optical signal.
本发明的进一步改进在于: 所述光学分光***的主要部件是光栅, 光学 分光***利用光栅的分光作用将光线色散成不同波长的光线。 A further improvement of the present invention resides in that: the main component of the optical splitting system is a grating, and the optical splitting system uses light splitting of the grating to disperse light into light of different wavelengths.
本发明的进一步改进在于: 所述信号采集***包括接收单元、 放大单元 和采集单元,接收单元用来将接收到的光信号转换成的微弱电信号传送到放 大单元,放大单元用来将接收单元发送来的微弱电信号放大到能够采集的程 度,采集单元用来将计算机不能识别的电信号即模拟信号转换成计算机可以 识别的数字信号。 A further improvement of the present invention is: the signal acquisition system comprises a receiving unit, an amplifying unit and an collecting unit, the receiving unit is configured to transmit the weak electrical signal converted into the received optical signal to the amplifying unit, and the amplifying unit is configured to receive the receiving unit The transmitted weak electrical signal is amplified to the extent that it can be acquired, and the acquisition unit is used to convert an electrical signal that is not recognized by the computer, that is, an analog signal, into a digital signal that can be recognized by the computer.
本发明的进一步改进在于: 所述校正***包括距离传感器和温度传感 器, 所述距离传感器用来测量被测物体与探头之间的距离, 温度传感器用来 测量被测物体的温度。
本发明的¾一步改进在于: 所述光谱处理***包括处理模块和分析模 块, 处理模块包括用来将采集的光谱信号进行预处理的预处理部, 用来减小 光谱中的高频噪声, 提高光谱信噪比的数字低通滤波器, 由于被测物体的距 离和温度会影响反射光强,把校正***得到的距离和温度信号代入通过预先 实验得到的距离和温度对光强影响关系函数的函数部中,用以减小由于距离 和温度变化对反射光强带来的影响,分析模块包括针对某一物质通过大量的 前期试验得到的函数部即数学模型,将预处理过的光谱信号经过该模型计算 之后, 可以得到特定物质的含量。 A further improvement of the present invention is that the correction system includes a distance sensor for measuring the distance between the object to be measured and the temperature sensor, and a temperature sensor for measuring the temperature of the object to be measured. The one-step improvement of the present invention is: the spectral processing system includes a processing module and an analysis module, and the processing module includes a pre-processing section for pre-processing the acquired spectral signal to reduce high-frequency noise in the spectrum and improve The digital low-pass filter with spectral signal-to-noise ratio, because the distance and temperature of the measured object will affect the reflected light intensity, the distance and temperature signals obtained by the correction system are substituted into the relationship between the distance and temperature obtained by the prior experiment on the light intensity. In the function part, to reduce the influence of the distance and temperature changes on the reflected light intensity, the analysis module includes a mathematical model of a function part obtained by a large number of preliminary tests for a certain substance, and the preprocessed spectral signal is passed. After the model is calculated, the content of a specific substance can be obtained.
本发明的进一步改进在于: 所述光源照射到被测物体上, 光线与被测物 体相互作用后, 产生漫反射光线, 经探头中的探镜收集并通过探头中的光纤 传送, 由所述光学分光***分光后, 通过所述信号采集***采集, 并将通过 校正***校正后的光谱, 交给光谱处理***进行光谱处理的定性和定量分 析, 从而确定检测结果。 A further improvement of the present invention is that: the light source is irradiated onto the object to be measured, and after the light interacts with the object to be measured, the diffuse reflection light is generated, collected by the probe in the probe and transmitted through the optical fiber in the probe, by the optical After the spectroscopic system splits the light, it is collected by the signal acquisition system, and the spectrum corrected by the calibration system is sent to the spectral processing system for qualitative and quantitative analysis of the spectral processing, thereby determining the detection result.
本发明与现有技术相比具有以下优点: 应用领域广、 测量精确, 可用于 多种行业的测量。 Compared with the prior art, the invention has the following advantages: wide application field, accurate measurement, and can be used for measurement in various industries.
附图说明: BRIEF DESCRIPTION OF THE DRAWINGS:
图 1为本发明结构示意图; Figure 1 is a schematic structural view of the present invention;
具体实施方式: detailed description:
为了加深对本发明的理解, 下面将结合实施例对本发明作进一步详述, 该实施例仅用于解释本发明, 并不构成对本发明保护范围的限定。 The present invention will be further described in detail with reference to the embodiments of the present invention, which are intended to be illustrative only, and not to limit the scope of the invention.
本发明示出了一种紫外、 可见、 近红外在线检测漫反射光谱分析仪的实 施方式, 所述光谱分析仪包括壳体, 壳体内部设有照明***、 探头、 光学分 光***、 信号采集***、 校正***和光谱处理***, 照明***、 信号采集系
统、校正***和光谱处理***共同连接有供电***,照明***用于发射紫外、 可见、 近红外波段的光线, 照明被测物体, 探头用于收集被测物体漫反射后 的光线, 并将收集后的光线传送给光学分光***, 光学分光***利用光栅将 光线分光形成不同波长的光,通过信号采集***将光信号转换成数字信号并 进行采集, 通过校正***校正后的光谱, 交给光谱处理***处理、 分析和显 示, 从而确定检测结果, 且应用测量范围广, 探头包括探镜和光纤, 探镜用 来扩大采光面积, 使更多的光线进入分光***; 光纤用来传输光信号, 光学 分光***的主要部件是光栅,光学分光***利用光栅的分光作用将光线色散 成不同波长的光线, 信号采集***包括接收单元、 放大单元和采集单元, 接 收单元用来将接收到的光信号转换成的微弱电信号传送到放大单元,放大单 元用来将接收单元发送来的微弱电信号放大到能够采集的程度,采集单元是 将计算机不能识别的电信号即模拟信号转换成计算机可以识别的数字信号, 校正***包括距离传感器和温度传感器,距离传感器用来测量被测物体与探 头之间的距离, 温度传感器用来测量被测物体的温度, 光谱处理***包括处 理模块和分析模块,处理模块包括用来将采集的光谱信号进行预处理的预处 理部, 用来减小光谱中的高频噪声, 提高光谱信噪比的数字低通滤波器, 由 于被测物体的距离和温度会影响反射光强,把校正***得到的距离和温度信 号代入通过预先实验得到的距离和温度对光强影响关系函数的函数部中,用 以减小由于距离和温度变化对反射光强带来的影响,分析模块包括针对某一 物质通过大量的前期试验得到的函数部即数学模型,将预处理过的光谱信号 经过该模型计算之后,可以得到特定物质的含量,可以得到特定物质的含量, 与常规分析技术不同, 近红外光谱是一种间接分析技术, 必须通过建立数学 模型来实现对未知样品的定性或定量分析,在分析时主要通过包括以下几个
步骤: 先选择有代表性的样品并测量其近红外光谱, 采用标准或认可的参考 方法测定所关心的组分或性质数据, 将测量的光谱和基础数据, 用适当的化 学计量方法建立数学模型, 从而进行未知样品组分或性质的测定, 本发明所 述的分析仪即是通过光源照射到被测物体上, 光线与被测物体相互作用后, 产生漫反射光线, 经探头中的探镜收集并通过探头中的光纤传送, 由所述光 学分光***分光后, 通过所述信号采集***采集, 通过校正***校正后的光 谱,交给光谱处理***进行光谱处理的定性和定量分析,从而确定检测结果, 可用于石油及石油化工、基本有机化工、精细化工、冶金、生命科学、制药、 医学临床、 农业、 食品、 饮料、 烟草、 纺织、 造纸、 化妆品、 质量监督、 环 境保护、 高校及科研院所等, 在石化领域可测定油品的辛烷值、 族组成、 十 六垸值、 闪点、 冰点、 凝固点、 馏程、 MTBE含量等, 在农业领域可以测定 谷物的蛋白质、 糖、 脂肪、 纤维、 水分含量等, 在医药领域可以测定药品中 有效成分, 组成和含量, 亦可进行样品的种类鉴别, 如酒类和香水的真假辨 别, 环保废弃物的分检等, 这种紫外、 可见、 近红外在线检测漫反射光谱分 析仪的分析检测结果较为精确, 且对被测物体无损害, 无须进行预处理, 这 样测量时较为简便。
The present invention shows an embodiment of an ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer, the spectrum analyzer comprising a housing, an illumination system, a probe, an optical spectroscopic system, and a signal acquisition system , calibration systems and spectral processing systems, lighting systems, signal acquisition systems The system, the calibration system and the spectral processing system are connected to a power supply system. The illumination system is used to emit ultraviolet, visible, and near-infrared light, illuminate the object to be measured, and the probe is used to collect the light after the object is diffusely reflected, and will collect The latter light is transmitted to the optical splitting system. The optical splitting system uses the grating to split the light into different wavelengths of light, converts the optical signal into a digital signal through a signal acquisition system, and performs acquisition, and corrects the corrected spectrum of the system and gives it to the spectral processing. The system processes, analyzes, and displays to determine the test results, and the measurement range is wide. The probe includes a probe and an optical fiber. The probe is used to expand the light-recovering area to allow more light to enter the spectroscopic system. The optical fiber is used to transmit optical signals. The main component of the spectroscopic system is a grating. The optical spectroscopic system uses the spectroscopic action of the grating to disperse the light into different wavelengths of light. The signal acquisition system comprises a receiving unit, an amplifying unit and an acquisition unit, and the receiving unit is configured to convert the received optical signal into Weak electrical signal is transmitted to the amplification list The amplifying unit is configured to amplify the weak electrical signal sent by the receiving unit to a degree that can be collected, and the collecting unit converts the electrical signal that the computer cannot recognize, that is, the analog signal into a digital signal that can be recognized by the computer, and the calibration system includes the distance sensor and the temperature. The sensor, the distance sensor is used to measure the distance between the measured object and the probe, the temperature sensor is used to measure the temperature of the measured object, the spectral processing system comprises a processing module and an analysis module, and the processing module comprises a pre-preparation of the acquired spectral signal. The pre-processing part of the processing, the digital low-pass filter used to reduce the high-frequency noise in the spectrum and improve the spectral signal-to-noise ratio. Since the distance and temperature of the measured object affect the reflected light intensity, the distance obtained by the correction system is The temperature signal is substituted into the function part of the relationship between the distance and temperature obtained by the prior experiment on the light intensity, to reduce the influence of the distance and temperature change on the reflected light intensity, and the analysis module includes a large amount of The function part obtained in the previous experiment is the mathematical model, which will preprocess the light. After the spectrum signal is calculated by the model, the content of the specific substance can be obtained, and the content of the specific substance can be obtained. Unlike the conventional analysis technology, the near-infrared spectrum is an indirect analysis technique, and the mathematical model must be established to realize the identification of the unknown sample. Or quantitative analysis, mainly through the following Steps: First select a representative sample and measure its near-infrared spectrum, use standard or approved reference methods to determine the component or property data of interest, and use the appropriate stoichiometry to establish a mathematical model using the measured spectra and basic data. To determine the composition or properties of the unknown sample, the analyzer of the present invention is irradiated onto the object to be measured by the light source, and the light interacts with the object to be measured to generate diffuse light, which is reflected by the probe. Collecting and transmitting through the optical fiber in the probe, after being split by the optical spectroscopic system, collecting by the signal acquisition system, correcting the corrected spectrum of the system, and handing it to the spectral processing system for qualitative and quantitative analysis of the spectral processing, thereby determining Test results, can be used in petroleum and petrochemical, basic organic chemicals, fine chemicals, metallurgy, life sciences, pharmaceuticals, medical clinical, agriculture, food, beverage, tobacco, textile, paper, cosmetics, quality supervision, environmental protection, universities and research Institutes, etc., in the petrochemical field, the oil can be measured Value, family composition, hexadecimal value, flash point, freezing point, freezing point, distillation range, MTBE content, etc. In the agricultural field, the protein, sugar, fat, fiber, moisture content, etc. of the grain can be determined, and the medicine can be determined in the medicine field. The active ingredient, composition and content can also be used to identify the type of sample, such as the true and false identification of alcohol and perfume, the classification of environmental waste, etc., the analysis of this ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer The test results are more accurate, and there is no damage to the measured object, no need to pre-process, so the measurement is relatively simple.
Claims
1、 一种紫外、 可见、 近红外在线检测漫反射光谱分析仪, 其特征在于: 所述光谱分析仪包括壳体, 所述壳体内部设有照明***、 探头、 光学分光系 统、 信号采集***、 校正***和光谱处理***, 所述照明***、 信号采集系 统、校正***和光谱处理***共同连接有供电***, 所述照明***用于发射 紫外、 可见、 近红外波段的光线, 照明被测物体, 所述探头用于收集被测物 体漫反射后的光线, 并将收集后的光线传送给光学分光***, 光学分光*** 利用光栅将光线分光形成不同波长的光,信号采集***将光信号转换成数字 信号并进行采集, 通过校正***校正后的光谱, 交给光谱处理***处理、 分 析和显示, 从而确定检测结果。 1. An ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer, characterized in that: the spectrum analyzer comprises a casing, and the casing is internally provided with an illumination system, a probe, an optical spectroscopic system, and a signal acquisition system. And a calibration system and a spectral processing system, wherein the illumination system, the signal acquisition system, the calibration system, and the spectral processing system are connected to a power supply system, and the illumination system is configured to emit ultraviolet, visible, and near-infrared light, and illuminate the measured object. The probe is configured to collect the diffused light of the measured object, and transmit the collected light to the optical splitting system. The optical splitting system uses the grating to split the light into different wavelengths of light, and the signal acquisition system converts the optical signal into The digital signal is collected and corrected by the calibration system, and then processed, analyzed and displayed by the spectral processing system to determine the detection result.
2、 根据权利要求 1所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪, 其特征在于: 所述探头包括探镜和光纤, 所述探镜用来扩大采光面积, 使更多的光线进入分光***, 光纤用来传输光信号。 2. The ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer according to claim 1, wherein: the probe comprises a probe and an optical fiber, and the probe is used to expand the light-receiving area to make more light. Entering the splitting system, the fiber is used to transmit optical signals.
3、 根据权利要求 1所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪, 其特征在于: 所述光学分光***的主要部件是光栅, 所述光学分光*** 利用光栅的分光作用将光线色散成不同波长的光线。 3. The ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer according to claim 1, wherein: the main component of the optical spectroscopic system is a grating, and the optical spectroscopic system uses light splitting of the grating to disperse the light. Light into different wavelengths.
4、 根据权利要求 1所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪, 其特征在于: 所述信号采集***包括接收单元、 放大单元和采集单元, 所述接收单元用来将接收到的光信号转换成的微弱电信号传送到放大单元, 所述放大单元用来将接收单元发送来的微弱电信号放大到能够采集的程度; 所述采集单元用来将计算机不能识别的电信号即模拟信号转换成计算机可 以识别的数字信号。 4. The ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer according to claim 1, wherein: the signal acquisition system comprises a receiving unit, an amplifying unit and an acquiring unit, and the receiving unit is configured to receive the The weak electrical signal converted into the optical signal is transmitted to the amplifying unit, and the amplifying unit is configured to amplify the weak electrical signal sent by the receiving unit to a degree that can be collected; the collecting unit is configured to use an electrical signal that is not recognized by the computer. The analog signal is converted into a digital signal that the computer can recognize.
5、 根据权利要求 1 所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪, 其特征在于: 所述校正***包括距离传感器和温度传感器, 所述距离传 感器用来测量被测物体与探头之间的距离,温度传感器用来测量被测物体的 温度。 5. Ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectroscopy according to claim 1. The calibration system includes: a distance sensor for measuring a distance between the measured object and the probe, and a temperature sensor for measuring a temperature of the measured object.
6、 根据权利要求 1所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪, 其特征在于: 所述光谱处理***包括处理模块和分析模块, 所述处理模 块包括用来将采集的光谱信号进行预处理的预处理部,用来减小光谱中的高 频噪声, 提高光谱信噪比的数字低通滤波器, 由于被测物体的距离和温度会 影响反射光强,把校正***得到的距离和温度信号代入通过预先实验得到的 距离和温度对光强影响关系函数的函数部中,用以减小由于距离和温度变化 对反射光强带来的影响,所述分析模块包括针对某一物质通过大量的前期试 验得到的函数部即数学模型, 将预处理过的光谱信号经过该模型计算之后, 可以得到特定物质的含量,所述分析模块是针对某一物质通过大量的前期试 验得到的数学模型, 将预处理过的光谱信号经过该模型计算之后, 可以得到 特定物质的含量。 6. The ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer according to claim 1, wherein: said spectral processing system comprises a processing module and an analysis module, said processing module comprising spectral signals for collecting Pre-processing part for pre-processing, digital low-pass filter for reducing high-frequency noise in the spectrum and improving spectral signal-to-noise ratio. Since the distance and temperature of the measured object affect the reflected light intensity, the correction system is obtained. The distance and temperature signals are substituted into the function portion of the relationship between the distance and the temperature-affected relationship of the light intensity obtained by the prior experiment to reduce the influence of the distance and the temperature change on the reflected light intensity, and the analysis module includes The function is obtained by a large number of preliminary experiments, that is, the mathematical model. After the pre-processed spectral signal is calculated by the model, the content of the specific substance can be obtained. The analysis module is obtained by a large number of preliminary tests for a certain substance. Mathematical model, after the pre-processed spectral signal is calculated by the model, Content of specific substances.
7、 根据权利要求 1 所述紫外、 可见、 近红外在线检测漫反射光谱分析 仪,其特征在于:所述光源照射到被测物体上,光线与被测物体相互作用后, 产生漫反射光线, 经探头中的探镜收集并通过探头中的光纤传送, 由所述光 学分光***分光后, 通过所述信号采集***采集, 并将通过校正***校正后 的光谱, 交给光谱处理***进行光谱处理的定性和定量分析, 从而确定检测 结果。 7. The ultraviolet, visible, near-infrared on-line detection diffuse reflectance spectrum analyzer according to claim 1, wherein the light source is irradiated onto the object to be measured, and the light interacts with the object to be measured to generate diffuse reflection light. Collected by the probe in the probe and transmitted through the optical fiber in the probe, after being split by the optical splitting system, collected by the signal acquisition system, and the spectrum corrected by the calibration system is sent to the spectral processing system for spectral processing. Qualitative and quantitative analysis to determine the test results.
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