CN110596013A - A high optical rotation rate material optical rotation rate detection device - Google Patents
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Abstract
一种高旋光率材料旋光率检测装置，包括顺序设置的光源、玻璃基底偏振分光膜、待测直角斜面型旋光材料、圆心固定的可旋转圆盘、偏振分束棱镜、光电探测器、差除和信号处理器、频谱仪；光源产生的光线通过待测旋光材料后，进入偏振分束棱镜被分为振动方向互相垂直的两束线偏振光，并分别被光电探测器探测光强，光电探测器检测到的信号输入差除和信号处理器进行运算处理，最后传输至频谱仪显示频谱。本发明将静态旋光角度转变为动态旋光角度，采用了频谱分析技术，实现了对大于的大旋光角进行检测，且角度检测范围理论上没有上限，解决了大旋光角检测的难题；根据旋光角与旋光率的关系，可以方便得到材料的旋光率。
A high optical rotation material optical rotation detection device, including sequentially arranged light source, glass substrate polarization beam splitting film, right angle inclined plane optical rotation material to be tested, rotatable disc with fixed center, polarization beam splitting prism, photodetector, difference divider And signal processor, spectrometer; the light generated by the light source passes through the optically active material to be tested, enters the polarization beam splitting prism and is divided into two beams of linearly polarized light whose vibration directions are perpendicular to each other, and is detected by the photodetector respectively. The input signal detected by the detector is divided and processed by the signal processor, and finally transmitted to the spectrum analyzer to display the spectrum. The invention transforms the static optical rotation angle into a dynamic optical rotation angle, adopts the spectrum analysis technology, and realizes the The large rotation angle is detected, and the angle detection range has no upper limit in theory, which solves the problem of large rotation angle detection; according to the relationship between the rotation angle and the rotation rate, the optical rotation rate of the material can be obtained conveniently.
Description
技术领域technical field
本发明涉及一种高旋光率材料旋光率检测装置，属于光电检测、光电传感和光信息处理的技术领域。The invention relates to a device for detecting the optical rotation of a high optical rotation material, belonging to the technical fields of photoelectric detection, photoelectric sensing and optical information processing.
背景技术Background technique
物质的旋光性自从19世纪被发现以来，其在光学检测及光电传感领域的应用越来越广泛；其中应用最多的是液体浓度检测、位移传感检测、光学滤波器、偏光干涉等涉及光检测、光传感、光通信等多个光学领域。Since the optical activity of substances was discovered in the 19th century, its applications in the field of optical detection and photoelectric sensing have become more and more extensive; the most widely used are liquid concentration detection, displacement sensing detection, optical filters, polarization interference, etc. Detection, optical sensing, optical communication and other optical fields.
目前，随着化学和材料科学的迅速发展，新的旋光材料、旋光药物等不断被加工合成使用，高旋光率材料屡见不鲜。对于具有旋光属性的材料的旋光率的测量一方面有助于了解材料的物理性质，另一方面有助于研究材料的分子组成结构。在对旋光率的测量过程中，低旋光率材料的旋光率测量比较容易，只要测量出线偏振光通过旋光材料的旋光角即可根据相关公式计算出旋光率；然而，有一些材料的旋光率很大，比如：在589nm的光波长下，石英晶体的旋光率为21.724°/mm，胆甾相液晶的旋光率为1800°/mm。因此一定厚度的高旋光率材料所产生的旋光角度往往为（为锐角，n=1,2,3……），而一般的测量方法却只能检测到值，导致测量结果忽略了的部分，因此测量出的旋光率不对。而对于大于的大旋光角的检测技术目前还未见报道。At present, with the rapid development of chemistry and material science, new optically active materials and optically active drugs are constantly being processed and synthesized, and high optically active materials are not uncommon. The measurement of the optical rotation of materials with optical rotation properties helps to understand the physical properties of materials on the one hand, and helps to study the molecular composition and structure of materials on the other hand. In the process of measuring the optical rotation, the measurement of the optical rotation of the low optical rotation material is relatively easy, as long as the optical rotation angle of the linearly polarized light passing through the optical rotation material is measured, the optical rotation can be calculated according to the relevant formula; however, some materials have very low optical rotation. Large, for example: at the light wavelength of 589nm, the optical rotation rate of quartz crystal is 21.724°/mm, and the optical rotation rate of cholesteric liquid crystal is 1800°/mm. Therefore, the optical rotation angle produced by a high optical rotation rate material with a certain thickness is often ( is an acute angle, n=1,2,3...), but the general measurement method can only detect value, causing measurements to ignore the part, so the measured optical rotation is wrong. and for greater than The detection technology of large optical rotation angle has not been reported yet.
发明内容Contents of the invention
本发明的目的在于提出一种高旋光率材料旋光率检测方案，解决高旋光率材料旋光率检测问题。本发明通过对待测样品的形状和检测装置的设计，将静态旋光角度转变为动态旋光角度，采用了频谱分析技术，实现了对大于360º的大旋光角进行检测，且角度检测范围理论上没有上限，解决了大旋光角检测的难题；根据旋光角与旋光率的关系，可以方便得到材料的旋光率。本发明可以很好的应用于高旋光率材料旋光率的检测，有效解决了高旋光率材料旋光率检测的问题。The purpose of the present invention is to propose a detection scheme for the optical rotation of high optical rotation materials to solve the problem of detection of optical rotation of high optical rotation materials. The invention converts the static optical rotation angle into a dynamic optical rotation angle through the design of the shape of the sample to be tested and the detection device, and adopts the spectrum analysis technology to realize the detection of a large optical rotation angle greater than 360º, and the angle detection range has no upper limit in theory , which solves the problem of large optical rotation angle detection; according to the relationship between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be obtained conveniently. The invention can be well applied to the detection of the optical rotation rate of the high optical rotation rate material, and effectively solves the problem of the optical rotation rate detection of the high optical rotation rate material.
一种高旋光率材料旋光率检测装置，其特征在于：A high optical rotation material optical rotation detection device, characterized in that:
所述检测装置包括顺序设置的光源、玻璃基底偏振分光膜、待测直角斜面型旋光材料、圆心固定的可旋转圆盘、偏振分束棱镜、光电探测器、差除和信号处理器、频谱仪；The detection device includes a sequentially arranged light source, a glass substrate polarizing beam splitting film, a right-angle inclined plane optically active material to be tested, a rotatable disc with a fixed center, a polarizing beam splitting prism, a photodetector, a subtraction and signal processor, and a spectrum analyzer. ;
所述玻璃基底偏振分光膜设置在待测旋光材料的斜面上；The glass substrate polarizing spectroscopic film is arranged on the slope of the optically active material to be measured;
所述待测直角斜面型旋光材料的侧面固定在可旋转圆盘的圆周上一点，跟随着圆盘的旋转移动，在移动时保持两直角边的水平和竖直状态不变；The side of the optically active material to be tested is fixed at a point on the circumference of the rotatable disk, and moves along with the rotation of the disk, keeping the horizontal and vertical states of the two right-angle sides unchanged during the movement;
所述光源产生的光线通过待测旋光材料后，进入偏振分束棱镜被分为振动方向互相垂直的两束线偏振光，并分别被光电探测器探测光强，光电探测器检测到的信号输入差除和信号处理器进行运算处理，最后传输至频谱仪显示频谱。After the light generated by the light source passes through the optically active material to be tested, it enters the polarization beam splitter prism and is divided into two beams of linearly polarized light whose vibration directions are perpendicular to each other, and the light intensity is detected by the photodetector respectively, and the signal detected by the photodetector is input The subtraction and signal processor are used for arithmetic processing, and finally transmitted to the spectrum analyzer to display the spectrum.
进一步地，所述光源可为激光光源或准直光源。Further, the light source may be a laser light source or a collimated light source.
进一步地，所述待测旋光材料做成直角斜面体，其斜面与底面的夹角为，且在光的传播方向上具有旋光性。Further, the optically active material to be tested is made into a right-angled inclined plane, and the angle between the inclined plane and the bottom surface is , and has optical activity in the direction of light propagation.
进一步地，所述偏振分束膜的玻璃基底与待测旋光材料的斜面用光学胶紧密胶合在一起。Further, the glass substrate of the polarizing beam splitting film and the inclined surface of the optically active material to be tested are closely glued together with optical glue.
进一步地，所述圆盘的半径为R，圆心为O并固定，圆盘可绕圆心O点匀速转动。Further, the radius of the disc is R, the center of the circle is O and fixed, and the disc can rotate at a constant speed around the center O.
进一步地，所述待测旋光材料做成的直角斜面体的竖直直角边的边长要求大于2R，以避免圆盘转动带动旋光材料上下移动时光线脱离旋光材料。Further, the length of the vertical right-angled side of the right-angled inclined plane made of the optically active material to be tested is required to be greater than 2R, so as to prevent the light from detaching from the optically active material when the disc rotates to drive the optically active material to move up and down.
本发明具有的有益效果为：本发明通过对待测样品的形状和检测装置的设计，将静态旋光角度转变为动态旋光角度，采用了频谱分析技术，实现了对大于360º的大旋光角进行检测，且角度检测范围理论上没有上限，解决了大旋光角检测的难题；根据旋光角与旋光率的关系，可以方便得到材料的旋光率。本发明可以很好的应用于高旋光率材料旋光率的检测，有效解决了高旋光率材料旋光率检测的问题。The beneficial effects of the present invention are as follows: the present invention converts the static optical rotation angle into a dynamic optical rotation angle through the shape of the sample to be tested and the design of the detection device, adopts the spectrum analysis technology, and realizes the detection of a large optical rotation angle greater than 360º, And the angle detection range has no upper limit in theory, which solves the problem of large optical rotation angle detection; according to the relationship between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be easily obtained. The invention can be well applied to the detection of the optical rotation rate of the high optical rotation rate material, and effectively solves the problem of the optical rotation rate detection of the high optical rotation rate material.
附图说明Description of drawings
图1为本发明所述高旋光率材料旋光率检测装置的结构示意图。Fig. 1 is a schematic structural view of the optical rotation detection device of the high optical rotation material according to the present invention.
图2为频谱分量幅度随旋光角的变化关系。Figure 2 shows the amplitude of the spectral components with the optical rotation angle change relationship.
图3为=500度时频谱结构图。Figure 3 is = 500 degrees of spectrum structure diagram.
图中，1-激光或准直光源、2-偏振分束膜、3-待测旋光材料、4-圆盘、5-偏振分束棱镜、6-光电探测器、7-光电探测器、8-差除和信号处理器、9-频谱仪。In the figure, 1-laser or collimated light source, 2-polarization beam splitting film, 3-optical active material to be measured, 4-disk, 5-polarization beam splitting prism, 6-photodetector, 7-photodetector, 8 - Subtraction and Signal Processor, 9 - Spectrum Analyzer.
具体实施方式Detailed ways
下面结合说明书附图对本发明的技术方案做进一步的详细说明。The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.
一种高旋光率材料旋光率检测装置，包括顺序设置的光源1、玻璃基底偏振分光膜2、待测直角斜面型旋光材料3、圆心固定的可旋转圆盘4、偏振分束棱镜5、光电探测器6和7、差除和信号处理器8、频谱仪9。A device for detecting the optical rotation of a material with high optical rotation rate, comprising a sequentially arranged light source 1, a glass substrate polarizing beam splitting film 2, a right-angle inclined plane optically active material 3, a rotatable disk with a fixed center 4, a polarizing beam splitting prism 5, a photoelectric Detectors 6 and 7, subtraction and signal processor 8, spectrum analyzer 9.
所述玻璃基底偏振分光膜2设置在待测旋光材料3的斜面上，所述偏振分束膜2的玻璃基底与待测旋光材料3的斜面用光学胶紧密胶合在一起。The glass substrate polarization beam splitting film 2 is arranged on the slope of the optically active material 3 to be tested, and the glass base of the polarization beam splitting film 2 and the slope of the optically active material 3 to be tested are tightly glued together with optical glue.
所述待测直角斜面型旋光材料3的侧面固定在可旋转圆盘4的圆周上一点，跟随着圆盘4的旋转移动，在移动时保持两直角边的水平和竖直状态不变。The side of the right-angle inclined-plane optically active material 3 to be tested is fixed on a point on the circumference of the rotatable disc 4, and moves along with the rotation of the disc 4, keeping the horizontal and vertical states of the two right-angle sides unchanged during the movement.
所述光源1产生的光线通过待测旋光材料2后，进入偏振分束棱镜5被分为振动方向互相垂直的两束线偏振光，并分别被光电探测器6和7探测光强，光电探测器6和7检测到的信号输入差除和信号处理器8进行运算处理，最后传输至频谱仪显示频谱9。After the light generated by the light source 1 passes through the optically active material 2 to be measured, it enters the polarization beam splitting prism 5 and is divided into two beams of linearly polarized light whose vibration directions are perpendicular to each other. The signals detected by the detectors 6 and 7 are divided and processed by the signal processor 8, and finally transmitted to the spectrum analyzer to display the spectrum 9.
所述光源1可为激光光源或准直光源。The light source 1 can be a laser light source or a collimated light source.
所述待测旋光材料2做成直角斜面体，其斜面与底面的夹角为，且在光的传播方向上具有旋光性。The optically active material 2 to be measured is made into a right-angled inclined plane, and the angle between the inclined plane and the bottom surface is , and has optical activity in the direction of light propagation.
所述圆盘4的半径为R，圆心为O并固定，圆盘4可绕圆心O点匀速转动。The radius of the disc 4 is R, the center of circle is O and fixed, and the disc 4 can rotate at a constant speed around the center O.
所述待测旋光材料3做成的直角斜面体的竖直直角边的边长要求大于2R，以避免圆盘4转动带动旋光材料上下移动时光线脱离旋光材料。The length of the vertical side of the right-angled inclined plane made of the optically active material 3 to be tested is required to be greater than 2R, so as to prevent light from detaching from the optically active material when the disc 4 rotates to drive the optically active material to move up and down.
参照图1，设光电探测器6为PD1，光电探测器7为PD2，两者探测到的光强分别设为I1和I2，设待测材料旋光率为，斜面与底面的夹角为，待测旋光材料做成的直角斜面体的后侧面固定在一个可匀速转动的圆盘4上，固定点为圆盘上的G点，圆盘圆心为O点，圆盘的半径设为R，OX轴方向设为水平方向，转动角速度设为。Referring to Figure 1, let the photodetector 6 be PD1, and the photodetector 7 be PD2, the light intensity detected by the two is respectively set as I 1 and I 2 , and the optical rotation rate of the material to be tested is set as , the angle between the slope and the bottom is , the rear side of the right-angled slope made of the optically active material to be tested is fixed on a disc 4 that can rotate at a constant speed, the fixed point is point G on the disc, the center of the disc is point O, and the radius of the disc is set to R , the direction of the OX axis is set to the horizontal direction, and the rotational angular velocity is set to .
先使OG方向与OX轴方向重合，此时线偏振光通过旋光材料产生了一初始旋光角度。 再使圆盘以角速度匀速转动（为便于分析，可设方向为逆时针方向,顺时针转动分析方法相同），此时光线经过旋光材料产生的静态旋光角即转变为动态旋光角，经过时间t后圆盘转过角度，此时旋光材料向上移动的距离为：First make the OG direction coincide with the OX axis direction, at this time the linearly polarized light passes through the optically active material to generate an initial optical rotation angle . Then make the disc with angular velocity Rotate at a constant speed (for the convenience of analysis, it can be set The direction is counterclockwise, and the analysis method of clockwise rotation is the same), at this time, the static optical rotation angle generated by the light passing through the optically active material is transformed into a dynamic optical rotation angle, and after the time t, the disc rotates through the angle , the distance that the optically active material moves upward at this time is:
（1） (1)
从而线偏振光在旋光材料3中增加的光程为：Thus, the increased optical path of linearly polarized light in the optically active material 3 is:
（2） (2)
所产生的旋光角度为:The resulting angle of rotation is:
（3） (3)
当时旋光材料向上移动的距离达到最大为R, 旋光角度增加值达到最大为，当时光线又回到原来位置，此时光线在旋光材料中没有增加旋光角度，当时旋光材料向下移动的距离达到最大为R，旋光角度减小值达到最大为，当时光线又回到原来位置，此时光线在旋光材料中没有增加旋光角度。when When the optically active material moves upward the distance reaches the maximum R, and the increase value of the optical rotation angle reaches the maximum ,when When the ray returns to the original position, the ray does not increase the optical rotation angle in the optically active material at this time, when The distance that the optically active material moves downward reaches a maximum of R, and the reduction value of the optical rotation angle reaches a maximum of ,when When the ray returns to its original position, the ray does not increase the optical rotation angle in the optically active material.
设光线经过偏振分束膜2之后的初始光强为，样品的光强吸收系数为，长度为l，令，则根据马吕斯定律及朗伯定律，PD1的接收光强为：Let the initial light intensity after the light passes through the polarizing beam splitting film 2 be , the light intensity absorption coefficient of the sample is , with length l, let , then according to Marius' law and Lambert's law, the received light intensity of PD1 for:
（4） (4)
PD2的接收光强为：Received light intensity of PD2 for:
（5） (5)
信号处理器7输出的相对光强信号为：The relative light intensity signal that signal processor 7 outputs is:
（6） (6)
由贝塞尔函数可知：From the Bessel function we know:
（7） (7)
所以：so:
（8） (8)
由代入（8）式可得：Depend on Substitute into (8) to get:
（9） (9)
由（9）式可见，相对光强信号中包含直流分量以及频率为（n=1、2、3……）的一系列交流分量，交流分量的幅度即为交流分量系数的绝对值。由于R和均为已知值，因此测量到的值即可计算旋光率的值。现取在500°范围内，作出各频谱分量的幅度随的变化关系如图2所示。由图2可见，各频谱分量随旋光角变化而变化，但均不是单调关系，因此，无法根据单一的频谱分量幅度值来判断旋光角度的实际大小；但由图2可见，每一旋光角度所对应的各频谱分量的幅度值的集合却是唯一的，因此可以根据频谱结构图来确定旋光角度的值。首先在频谱仪所显示的频谱结构图（例如图3所示）中读出各频率分量幅度值，再在图2中找到对应的各频谱分量的幅度值所对应的旋光角度，最终可以唯一确定旋光角的值，从而根据旋光角度与旋光率的关系公式计算出旋光率。It can be seen from formula (9) that the relative light intensity signal contains a DC component and a frequency of (n=1, 2, 3...) a series of AC components, the magnitude of the AC component is the absolute value of the AC component coefficient. Thanks to R and are known values, so the measured The value of the optical rotation can be calculated value. cash In the range of 500°, make the amplitude of each spectral component with The change relationship is shown in Figure 2. It can be seen from Figure 2 that each spectral component varies with the optical rotation angle changes, but neither of them is a monotonic relationship. Therefore, it is impossible to judge the actual size of the optical rotation angle based on the amplitude value of a single spectral component; but it can be seen from Figure 2 that each optical rotation angle The corresponding set of amplitude values of each spectral component is unique, so the optical rotation angle can be determined according to the spectral structure diagram value. First read the amplitude value of each frequency component in the spectrum structure diagram displayed by the spectrum analyzer (such as shown in Figure 3), and then find the corresponding optical rotation angle corresponding to the amplitude value of each spectrum component in Figure 2, and finally it can be uniquely determined Optical rotation angle Therefore, the optical rotation is calculated according to the relationship formula between the optical rotation angle and the optical rotation.
本发明通过对待测样品的形状和检测装置的设计，将静态旋光角度转变为动态旋光角度，采用了频谱分析技术，实现了对大于360º的大旋光角进行检测，且角度检测范围理论上没有上限，解决了大旋光角检测的难题；根据旋光角与旋光率的关系，可以方便得到材料的旋光率。本发明可以很好的应用于高旋光率材料旋光率的检测，有效解决了高旋光率材料旋光率检测的问题。The invention converts the static optical rotation angle into a dynamic optical rotation angle through the design of the shape of the sample to be tested and the detection device, and adopts the spectrum analysis technology to realize the detection of a large optical rotation angle greater than 360º, and the angle detection range has no upper limit in theory , which solves the problem of large optical rotation angle detection; according to the relationship between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be obtained conveniently. The invention can be well applied to the detection of the optical rotation rate of the high optical rotation rate material, and effectively solves the problem of the optical rotation rate detection of the high optical rotation rate material.
以上所述仅为本发明的较佳实施方式，本发明的保护范围并不以上述实施方式为限，但凡本领域普通技术人员根据本发明所揭示内容所作的等效修饰或变化，皆应纳入权利要求书中记载的保护范围内。The above descriptions are only preferred embodiments of the present invention, and the scope of protection of the present invention is not limited to the above embodiments, but all equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention should be included within the scope of protection described in the claims.
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