CN110596013B - High-optical-rotation-rate material optical rotation rate detection device - Google Patents
High-optical-rotation-rate material optical rotation rate detection device Download PDFInfo
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- CN110596013B CN110596013B CN201910887489.1A CN201910887489A CN110596013B CN 110596013 B CN110596013 B CN 110596013B CN 201910887489 A CN201910887489 A CN 201910887489A CN 110596013 B CN110596013 B CN 110596013B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
Abstract
A high optical rotation rate material optical rotation rate detection device comprises a light source, a glass substrate polarization beam splitting film, a right-angle inclined plane type optical rotation material to be detected, a rotatable disc with a fixed circle center, a polarization beam splitting prism, a photoelectric detector, a difference division and signal processor and a frequency spectrograph which are sequentially arranged; after passing through the optical rotation material to be detected, light generated by the light source enters the polarization beam splitter prism, is divided into two linearly polarized light beams with mutually vertical vibration directions, the light intensity is detected by the photoelectric detector respectively, the signal input difference detected by the photoelectric detector is divided by the signal processor for operation processing, and finally the light is transmitted to the frequency spectrograph for displaying frequency spectrum. The invention converts the static optical rotation angle into the dynamic optical rotation angle, adopts the spectrum analysis technology and realizes the aim of measuring the optical rotation angle larger than the dynamic optical rotation angle
The detection is carried out on the large optical rotation angle, and the angle detection range has no upper limit theoretically, so that the problem of large optical rotation angle detection is solved; according to the relation between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be conveniently obtained.
Description
Technical Field
The invention relates to a high-optical-rotation-rate material optical rotation rate detection device, belonging to the technical field of photoelectric detection, photoelectric sensing and optical information processing.
Background
Since the optical activity of a substance is discovered in the 19 th century, the optical activity of the substance is more and more widely applied to the fields of optical detection and photoelectric sensing; the most widely used are liquid concentration detection, displacement sensing detection, optical filters, polarization interference and the like, which relate to a plurality of optical fields such as optical detection, optical sensing, optical communication and the like.
At present, with the rapid development of chemistry and material science, new optical materials, optical drugs and the like are continuously processed and synthesized for use, and materials with high optical rotation rate are frequently used. The measurement of the optical rotation rate of a material having optical rotation properties is helpful for understanding the physical properties of the material on one hand and for studying the molecular composition structure of the material on the other hand. In the process of measuring the optical rotation rate, the optical rotation rate of the material with low optical rotation rate is easier to measure, and the optical rotation rate can be calculated according to a related formula as long as the optical rotation angle of linearly polarized light passing through the optical rotation material is measured; however, there are some materials with a high specific rotation, such as: at the wavelength of 589nm, the optical rotation of quartz crystal is 21.724 DEG/mm, and the optical rotation of cholesteric liquid crystal is 1800 DEG/mm. Therefore, the angle of rotation produced by a thickness of high optical rotation material tends to be
（
Acute angle, n =1,2,3 … …), whereas the general measurement method can only detect
Value, resulting in measurement result being ignored
And thus the measured optical rotation rate is not correct. And for a value greater than
The detection technique of large optical rotation angle has not been reported at present.
Disclosure of Invention
The invention aims to provide a scheme for detecting the optical rotation of a high-optical-rotation material, which solves the problem of optical rotation detection of the high-optical-rotation material. According to the invention, through the design of the shape of a sample to be detected and a detection device, a static optical rotation angle is converted into a dynamic optical rotation angle, a spectrum analysis technology is adopted, the detection of a large optical rotation angle larger than 360 degrees is realized, and the angle detection range theoretically has no upper limit, so that the problem of large optical rotation angle detection is solved; according to the relation between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be conveniently obtained. The method can be well applied to the detection of the optical rotation of the material with high optical rotation rate, and effectively solves the problem of the optical rotation detection of the material with high optical rotation rate.
A device for detecting the optical rotation rate of a high optical rotation rate material is characterized in that:
the detection device comprises a light source, a glass substrate polarization beam splitting film, a right-angle inclined plane type optical rotation material to be detected, a rotatable disc with a fixed circle center, a polarization beam splitter prism, a photoelectric detector, a difference and signal processor and a frequency spectrograph which are sequentially arranged;
the glass substrate polarization beam splitting film is arranged on the inclined plane of the optical rotation material to be detected;
the side surface of the right-angle inclined plane type optical rotation material to be detected is fixed at one point on the circumference of the rotatable disc, moves along with the rotation of the disc, and keeps the horizontal and vertical states of the two right-angle sides unchanged during movement;
after passing through the optical rotation material to be detected, light generated by the light source enters the polarization beam splitter prism, is divided into two linearly polarized light beams with mutually vertical vibration directions, the light intensity is detected by the photoelectric detector respectively, the signal input difference detected by the photoelectric detector is divided and processed by the signal processor, and finally the light is transmitted to the frequency spectrograph for displaying the frequency spectrum.
Further, the light source may be a laser light source or a collimated light source.
Furthermore, the optical rotation material to be detected is made into a right-angle inclined plane body, and the included angle between the inclined plane and the bottom surface is
And has optical rotation in the propagation direction of light.
Furthermore, the glass substrate of the polarization beam splitting film and the inclined plane of the optical rotation material to be detected are tightly glued together by optical cement.
Furthermore, the radius of the disc is R, the circle center is O and fixed, and the disc can rotate around the circle center O at a constant speed.
Furthermore, the length of the vertical right-angle side of the right-angle inclined plane body made of the optical rotation material to be detected is required to be larger than 2R, so that light is prevented from being separated from the optical rotation material when the optical rotation material is driven to move up and down by the rotation of the disc.
The invention has the following beneficial effects: according to the invention, through the design of the shape of a sample to be detected and a detection device, a static optical rotation angle is converted into a dynamic optical rotation angle, a spectrum analysis technology is adopted, the detection of a large optical rotation angle larger than 360 degrees is realized, and the angle detection range theoretically has no upper limit, so that the problem of large optical rotation angle detection is solved; according to the relation between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be conveniently obtained. The method can be well applied to the detection of the optical rotation of the material with high optical rotation rate, and effectively solves the problem of the optical rotation detection of the material with high optical rotation rate.
Drawings
Fig. 1 is a schematic structural diagram of a power detection device of a high-power material according to the present invention.
FIG. 2 shows the amplitude of spectral components as a function of the angle of rotation
The variation relationship of (a).
FIG. 3 is a drawing showing
=500 degree time-frequency spectrum structure diagram.
In the figure, 1-laser or collimation light source, 2-polarization beam splitting film, 3-optical rotation material to be measured, 4-disc, 5-polarization beam splitting prism, 6-photoelectric detector, 7-photoelectric detector, 8-difference division and signal processor and 9-frequency spectrograph.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
A high-optical-rotation-rate material optical rotation rate detection device comprises a light source 1, a glass substrate polarization light splitting film 2, a right-angle inclined plane type optical rotation material 3 to be detected, a rotatable disc 4 with a fixed circle center, a polarization beam splitter prism 5, photoelectric detectors 6 and 7, a difference division and signal processor 8 and a frequency spectrograph 9 which are sequentially arranged.
The glass substrate polarization beam splitting film 2 is arranged on the inclined plane of the optical rotation material 3 to be detected, and the glass substrate of the polarization beam splitting film 2 and the inclined plane of the optical rotation material 3 to be detected are tightly glued together by optical cement.
The side surface of the right-angle inclined plane type optical rotation material 3 to be detected is fixed at one point on the circumference of the rotatable disc 4 and moves along with the rotation of the disc 4, and the horizontal and vertical states of the two right-angle sides are kept unchanged during moving.
After passing through the optical rotation material 2 to be detected, light generated by the light source 1 enters the polarization beam splitter prism 5, is divided into two linearly polarized light beams with mutually vertical vibration directions, the light intensities are detected by the photoelectric detectors 6 and 7 respectively, the signal input difference detected by the photoelectric detectors 6 and 7 is divided by the signal processor 8 to be subjected to operation processing, and finally the light is transmitted to the frequency spectrograph for displaying the frequency spectrum 9.
The light source 1 may be a laser light source or a collimated light source.
The optical rotation material 2 to be detected is made into a right-angle inclined plane body, and the included angle between the inclined plane and the bottom surface is
And has optical rotation in the propagation direction of light.
The radius of the disc 4 is R, the circle center is O and fixed, and the disc 4 can rotate around the circle center O at a constant speed.
The length of the vertical right-angle side of the right-angle inclined plane body made of the optical rotation material 3 to be detected is required to be larger than 2R, so that light is prevented from being separated from the optical rotation material when the optical rotation material is driven to move up and down by the rotation of the disc 4.
Referring to fig. 1, the light intensity detected by the photodetector 6 is PD1, the light intensity detected by the photodetector 7 is PD2, and the detected light intensities are I1And I2Setting the optical rotation rate of the material to be measured to
The included angle between the inclined plane and the bottom surface is
The back side of right-angle inclined body made of optical rotation material to be measured is fixed on a disk 4 capable of uniformly rotating, the fixed point is G point on the disk, the center of the disk is O point, the radius of the disk is R, the OX axis direction is horizontal direction, and the rotating angular speed is set as
。
Firstly, the OG direction is coincided with the OX axis direction, and the linearly polarized light generates an initial optical rotation angle through the optical rotation material
. Then making the disc rotate at an angular velocity
Rotate at a constant speed (for analysis, can be provided with
In the direction ofCounterclockwise and clockwise rotation analysis methods) in the same manner, the static rotation angle generated by the optical rotation material is converted into the dynamic rotation angle, and the disk rotates by the angle after the time t
The distance that the optically active material moves upward at this time is:
so that the optical path length of the linearly polarized light in the optically active material 3 increases:
the generated optical rotation angle is:
when in use
When the distance of upward movement of the optically active material reaches a maximum of R, the increase value of the optical rotation angle reaches a maximum of R
When is coming into contact with
The light ray returns to the original position, and the light ray does not increase the rotating angle in the optically rotating material
When the distance of downward movement of the optically active material reaches a maximum of R, the decrease value of the optical rotation angle reaches a maximum of R
When is coming into contact with
The light returns to its original position where it does not increase the angle of rotation in the optically active material.
Let the initial light intensity of the light after passing through the polarization beam splitting film 2 be
The light intensity absorption coefficient of the sample is
Length of l, order
Then the received light intensity of PD1 is based on the Malus law and the Lambert law
Comprises the following steps:
received light intensity of PD2
Comprises the following steps:
the relative light intensity signal output by the signal processor 7 is:
known from the Bessel function:
therefore:
by
Substituting equation (8) can obtain:
as can be seen from the formula (9), the relative light intensity signal contains a DC component
And a frequency of
(n =1,2,3 … …), and the amplitude of the alternating current component is the absolute value of the coefficient of the alternating current component. Due to R and
are all known values, and therefore measured
The value of (A) can be used to calculate the optical rotation rate
The value of (c). Get at present
In the 500 deg. range, the amplitude of each frequency spectrum component is made to follow
The variation of (a) is shown in fig. 2. As can be seen from FIG. 2, the spectral components follow the angle of rotation
Change but all changeThe method is not a monotonous relation, so that the actual size of the optical rotation angle cannot be judged according to a single frequency spectrum component amplitude value; but as can be seen from fig. 2, each rotation angle is
The corresponding set of amplitude values of each spectral component is unique, so that the optical rotation angle can be determined according to the spectral structure diagram
The value of (c). Firstly, reading the amplitude value of each frequency component in a spectrum structure chart (such as shown in fig. 3) displayed by a spectrometer, then finding the optical rotation angle corresponding to the amplitude value of each corresponding frequency component in fig. 2, and finally, uniquely determining the optical rotation angle
The optical rotation rate is calculated according to a relational expression between the optical rotation angle and the optical rotation rate.
According to the invention, through the design of the shape of a sample to be detected and a detection device, a static optical rotation angle is converted into a dynamic optical rotation angle, a spectrum analysis technology is adopted, the detection of a large optical rotation angle larger than 360 degrees is realized, and the angle detection range theoretically has no upper limit, so that the problem of large optical rotation angle detection is solved; according to the relation between the optical rotation angle and the optical rotation rate, the optical rotation rate of the material can be conveniently obtained. The method can be well applied to the detection of the optical rotation of the material with high optical rotation rate, and effectively solves the problem of the optical rotation detection of the material with high optical rotation rate.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (5)
1. A device for detecting the optical rotation rate of a high optical rotation rate material is characterized in that:
the detection device comprises a light source, a glass substrate polarization beam splitting film, a right-angle inclined plane type optical rotation material to be detected, a rotatable disc with a fixed circle center, a polarization beam splitter prism, a photoelectric detector, a difference and signal processor and a frequency spectrograph which are sequentially arranged;
the glass substrate polarization beam splitting film is arranged on the inclined plane of the right-angle inclined plane type optical rotation material to be detected;
the side surface of the right-angle inclined plane type optical rotation material to be detected is fixed at one point on the circumference of the rotatable disc, moves along with the rotation of the disc, and keeps the horizontal and vertical states of the two right-angle sides unchanged during movement;
after passing through a right-angle inclined plane type optical rotation material to be detected, light generated by the light source enters the polarization beam splitter prism, is divided into two linearly polarized light beams with mutually vertical vibration directions, the light intensity is detected by the photoelectric detector respectively, signals detected by the photoelectric detector are input into the differential divider and the signal processor for operation processing, and finally the signals are transmitted to the frequency spectrograph for displaying a frequency spectrum; the side length of a vertical right-angle side of a right-angle inclined plane body made of the right-angle inclined plane type optical rotation material to be detected is required to be larger than 2R, so that light is prevented from being separated from the optical rotation material when the optical rotation material is driven to move up and down by the rotation of a disc; the detection device is used for detecting a high rotation angle larger than 360 degrees.
2. The apparatus for detecting a specific rotation of a high specific rotation material according to claim 1, wherein: the light source is a collimated light source.
3. The apparatus for detecting a specific rotation of a high specific rotation material according to claim 1, wherein: the light source is a laser light source.
4. The apparatus for detecting a specific rotation of a high specific rotation material according to claim 1, wherein: the right-angle inclined plane type optical rotation material to be detected is made into a right-angle inclined plane body, the included angle between the inclined plane and the bottom surface is alpha, and the optical rotation material has optical rotation in the light propagation direction.
5. The apparatus for detecting a specific rotation of a high specific rotation material according to claim 1, wherein: the glass substrate of the polarization beam splitting film and the inclined plane of the right-angle inclined plane type optical rotation material to be detected are tightly glued together by using optical cement.
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