High-precision area array optical rotation detection system and detection method based on light intensity type weak measurement double working intervals

Abstract

The invention provides a high-precision area array optical rotation detection system and detection method based on light intensity type weak measurement double working intervals, and belongs to the field of optical high-precision detection. In a light intensity type weak measurement theory U-shaped curve change diagram, two sections of intervals in which the light intensity changes oppositely along with the optical rotation degree exist, the light intensity in one section is enhanced along with the increase of the optical rotation degree of a substance, and the light intensity in the other section is weakened along with the increase of the optical rotation degree of the substance. Therefore, two measuring light paths with different initial working points are set by comprehensively adjusting the optical rotation modulation module and the post-selection module, the system is enabled to be in the two working intervals at the same time, then subtraction / division operation is performed on corresponding light intensity values in the two working intervals, and sensitivity and detection precision higher than those in a single working interval can be obtained. According to the invention, an area array detection mode is adopted, and each pixel of an area array is a measuring point, so that the optical rotation of a substance can be subjected to surface imaging, and the detection flux is improved.

Description

Technical Field

[0001] The present invention belongs to the field of high-precision optical detection, and specifically relates to a high-precision area array optical rotation detection system and detection method based on light intensity type weak measurement dual working intervals. Background Art

[0002] With the advent of the Industrial 4.0 era, higher requirements are placed on the accuracy and efficiency of detection technology. Optical detection methods are of great significance in many fields due to their advantages such as fast response, non-destructiveness and non-contact, and high-precision optical detection technology is particularly valuable. Quantum weak measurement theory can obtain observation results far greater than the eigenvalue by introducing approximately orthogonal pre- and post-selected states and maintaining a very small weak coupling strength. This effect is called weak value amplification and is widely used in the measurement of ultra-sensitive object deflection, time delay, temperature change, speed measurement, nonlinear effects and other tiny physical quantities. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision area array optical rotation detection system and detection method based on light intensity type weak measurement dual working intervals, which detects substances with optical rotation and belongs to the field of optical high-precision detection. Compared with a single interval, the dual interval used in this system has higher sensitivity. In addition, the area array detection method is adopted, and each pixel of the area array is a measurement point, which can perform surface imaging of the optical rotation of the substance, greatly improving the detection throughput.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is:

[0005] A high-precision area array optical rotation detection system based on light intensity type weak measurement with dual working intervals is characterized in that two measurement optical paths with different initial working points are set by comprehensively adjusting the optical rotation modulation module and the two-way post-selection module, so that the system is simultaneously in two working intervals where the light intensity changes with the optical rotation in opposite directions.

[0006] It also includes a light source module, a front selection module, a sample pool module, a spectroscopic module and two-way detection modules; the light emitted by the light source is pre-selected by the front selection module, and then divided into two paths by the spectroscopic module after passing through the optical rotation modulation module and the sample pool, and then post-selected by the post-selection module, and finally recorded by the two detection modules respectively; the optical rotation modulation module is used to introduce the initial optical rotation, and is combined with the post-selection module to jointly modulate the two detection modules, which are respectively located in two working intervals where the light intensity changes with the optical rotation in opposite directions.

[0007] The light source module includes a light source 1 and a collimator 2; the optical rotation modulation module includes a Soleil-Babinet compensator 3; the front selection module includes a front selection polarizer 4 and an optical rotation dispersion plate 5; the light splitting module includes a light splitting prism 6; the two-way rear selection modules include a rear selection polarizer 7, a rear selection polarizer 11, a double-cemented lens 8, and a double-cemented lens 12; the two-way detection module includes a sleeve 9, an industrial camera 10, a sleeve 13 and an industrial camera 14.

[0008] The light path is emitted from a light source (1), collimated by a collimator (2), and then an initial optical rotation is introduced by a Soleil-Babinet compensator (3). Then, the collimated light path is pre-selected by a pre-selection polarizer (4); the pre-selected light path passes through a sample pool replaced by an optical rotation dispersion plate (5), and then is split into two light beams by a beam splitter (6). The light paths are then post-selected by two post-selection polarizers (7) and a post-selection polarizer (11), respectively. Finally, the light paths are respectively passed through two double-cemented lenses (8) and a double-cemented lens (12) and recorded by an industrial camera, wherein the double-cemented lens (8) is recorded on an industrial camera (10); and the double-cemented lens (12) is recorded on an industrial camera (14).

[0009] The light sources used include super luminescent diodes (SLDs), light emitting diodes (LEDs), and the wavelength bands include near infrared light and visible light.

[0010] The light pre-selected by the front selection module includes linearly polarized light, circularly polarized light and elliptically polarized light.

[0011] The detection sample pool to be imaged is an optically active substance.

[0012] In summary, a high-precision area array optical rotation detection method based on dual working intervals of light intensity type weak measurement is provided, characterized in that it includes: the dual working intervals are two intervals in the light intensity type weak measurement theory that are nearly linear and in which the light intensity changes oppositely with the optical rotation; the light intensity in one interval increases with the increase of the optical rotation of the material, and the light intensity in the other interval decreases with the increase of the optical rotation of the material; based on this characteristic, two measurement optical paths with different initial working points are set by comprehensively adjusting the optical rotation modulation module and the post-selection module, so that the system is in the two working intervals at the same time, and then the corresponding light intensity values ​​in the two working intervals are subtracted / divided, so as to obtain higher sensitivity and detection accuracy than that of a single working interval.

[0013] In summary, a high-precision array optical rotation detection method based on light intensity type weak measurement dual working intervals specifically includes the following contents:

[0014] 1) Screening and recording of light sources: The light emitted by the light source is pre-selected by the front selection module, then divided into two paths by the light splitting module after passing through the optical rotation modulation module and the sample cell, then post-selected by the post-selection module, and finally recorded by the two detection modules respectively;

[0015] 2) Data processing part: preprocessing of two images, registration of two images, subtraction / division of two images, data calibration and calculation of optical rotation; the two light intensity images obtained by the two detection modules are preprocessed by noise reduction, target area interception, etc., and then the two light intensity images are registered to obtain point-to-point intensity registration images; the two registered light intensity images are subtracted / divided to obtain a single difference / ratio image, and the difference / ratio image is converted into an optical rotation image according to the calibration curve; and multiple images are collected to calculate the average value, and the adjacent pixels of the same image are averaged to improve the detection accuracy;

[0016] The data calibration includes: drawing a dual-interval light intensity change diagram through imaging data, finding the corresponding working intervals in the light intensity change diagram of the two intervals, and taking the intersection of the two working intervals. This range is the interval that can be used for high-precision and high-sensitivity measurement; compared with a single measurement interval, the two working intervals are combined to obtain a linear measurement interval with higher sensitivity.

[0017] The functions of the optical rotation modulation module include: the optical rotation modulation module is used to introduce the initial optical rotation, and combined with the rear selection module to jointly modulate the two detection modules located in two working intervals where the light intensity changes oppositely with the optical rotation; the detection method of the detection module includes: the detection module adopts area array imaging, which can realize the simultaneous measurement of the optical rotation of a certain area.

[0018] The data recorded by the detection module is of light intensity type. During data processing, the change in optical rotation is calculated by the change in light intensity to obtain the optical rotation data of the detected substance.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The present invention sets two measurement optical paths with different initial working points by comprehensively adjusting the optical rotation modulation module and the post-selection module, so that the system is in the two working intervals at the same time, and then subtracts / divides the corresponding light intensity values ​​in the two working intervals, thereby obtaining higher sensitivity and detection accuracy than that of a single working interval.

[0021] 2) The present invention adopts a planar array detection method, in which each pixel of the planar array is a measurement point, and the optical rotation of the material can be imaged, which greatly improves the detection flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a diagram of the light intensity type weak measurement high-precision area array optical rotation detection system of the present invention.

[0023] Figure 2 This is a U-shaped curve variation diagram of the light intensity type weak measurement theory of the present invention.

[0024] Figure 3 It is a linear fitting diagram of the working range of the left camera of the present invention.

[0025] Figure 4 It is a linear fitting diagram of the working range of the right camera of the present invention.

[0026] Figure 5 It is a linear fitting diagram of the comprehensive linear working range of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0028] The present invention provides a high-precision array optical rotation detection method and system based on light intensity type weak measurement dual working intervals. Figure 1 As shown, it includes a light source 1, a collimator 2, a Soleil-Babinet compensator 3, a front selective polarizer 4, an optical rotatory dispersion plate 5, a dichroic prism 6, a rear selective polarizer 7, a double cemented lens 8, a sleeve 9, an industrial camera 10, a rear selective polarizer 11, a double cemented lens 12, a sleeve 13, and an industrial camera 14.

[0029] In such Figure 2 In the theoretical U-shaped curve change diagram of light intensity type weak measurement shown in the figure, there are two intervals where the light intensity changes oppositely with the optical rotation. In one interval, the light intensity increases with the increase of the optical rotation of the material, and in the other interval, the light intensity decreases with the increase of the optical rotation of the material. According to this characteristic, by comprehensively adjusting the optical rotation modulation module and the post-selection module to set two measurement optical paths with different initial working points, the system is placed in these two working intervals at the same time, and then the corresponding light intensity values ​​in the two working intervals are subtracted / divided, which can obtain higher sensitivity and detection accuracy than a single working interval. In addition, this method adopts a planar array detection method, and each pixel of the planar array is a measurement point, which can perform planar imaging of the optical rotation of the material, greatly improving the detection flux. In this optical rotation detection system, the light emitted by the light source is pre-selected by the pre-selection module, and then divided into two paths after passing through the optical rotation modulation module and the sample cell, and then selected by the post-selection module, and finally recorded by the two detection modules respectively. The data processing part includes preprocessing of two-way images, registration of two-way images, subtraction / division of two-way images, data calibration and calculation of optical rotation.

[0030] The light path is emitted from the light source 1, collimated by the collimator 2, and then the initial optical rotation is introduced by the Soleil-Babinet compensator 3, and then the collimated light path is pre-selected by the pre-selection polarizer 4. The pre-selected light path passes through the sample cell replaced by the optical rotation dispersion plate 5, and then is divided into two light beams by the beam splitter 6, and then the light paths are post-selected by two post-selection polarizers 7 and polarizer 11 respectively, and finally passed through two doublet lenses 8 and 12 to be recorded on two industrial cameras 10 and 14.

[0031] After the system is built, the light emitted by the light source is collimated using a collimator, and then the collimated light path is pre-selected using a front-select polarizer, and then the initial optical rotation is introduced through a Soleil-Babinet compensator. In this system, the sample pool module is replaced by an optically active dispersion plate, and the optical rotation change of the sample can be simulated by rotating the optically active dispersion plate. After passing through the optically active dispersion plate, it is divided into two beams by a beam splitter prism, and combined with a rear-select polarizer and a Soleil-Babinet compensator to modulate two industrial cameras, which are located in two working intervals where the light intensity changes oppositely with the optical rotation.

[0032] After modulating the best working range, the optical activity of the optical rotatory dispersion plate is continuously changed by rotating it to simulate the change of the optical activity of the sample. The optical rotatory dispersion plate rotates in the same direction and records the scale. Every time the scale passes through a grid, two industrial cameras are used to simultaneously collect imaging data, which is a scale data point. The imaging data sets of the two intervals are continuously collected.

[0033] In the calibration process, the light intensity variation diagram of the two intervals is drawn through the imaging data, and the interval close to linearity is found in the light intensity variation diagram of the two intervals for matching, such as Figure 2 , Figure 3 and Figure 4 As shown in the figure, these two linear intervals are the linear intervals that can be used for combination. The two linear intervals are combined by incremental combination. The light intensity increment of each scale point in the two linear intervals relative to the starting point is calculated respectively, and then the light intensity increment of the same scale point in the two intervals is subtracted. Since the two linear intervals have opposite trends, subtracting them can obtain a larger light intensity difference, which is used as the light intensity value of the comprehensive interval at this scale. The light intensity difference obtained at each scale point is linearly fitted, so that the following can be obtained: Figure 5 The calibration curve under the combined integrated interval is shown, and the integrated interval has higher detection sensitivity and detection accuracy than the original two working intervals. The calibration curve can be used to directly calculate the optical rotation from the measured dual-path light intensity difference.

[0034] Furthermore, in order to realize area array imaging, the image data needs to be preprocessed. In this embodiment, the image is firstly preprocessed to reduce noise and capture the target area. When capturing the required target area, the uneven part of the edge of the imaging area can be cropped, so as to reduce the error caused by the edge.

[0035] Furthermore, in order to combine the dual working intervals when realizing area array imaging, the light intensity images of the two intervals must be registered and aligned to obtain a point-to-point light intensity registered image. The two registered light intensity images are subtracted / divided to obtain a single difference / ratio image, and the difference / ratio image is converted into an optical rotation image according to the calibration curve. In this embodiment, the difference of the two light intensity images is taken, and image processing is performed to improve the detection accuracy. The pixel points of the 2*2 area are selected as a large pixel point, and the average light intensity value of this small area is the light intensity value of this large pixel point. After the above processing, the two camera imaging is registered and aligned to obtain the optical rotation change of each large pixel point, realizing high-precision and high-sensitivity area array imaging detection, which greatly improves the detection throughput.

[0036] Experimental Case

[0037] In one embodiment of the present invention, the system used includes: a superluminescent diode, a Soleil-Babinet compensator, a front selective polarizer, an optical rotatory dispersion plate, a beam splitter, a rear selective polarizer, a doublet lens, a sleeve, an industrial area imaging camera, a bracket, and a light shield.

[0038] In one embodiment of the present invention, the operating wavelength band of the superluminescent diode is 830 nm.

[0039] In one embodiment of the present invention, the Soleil-Babinet compensator is a continuously variable zero-order retarder with an operating wavelength of 740-1650nm, which can provide a uniform delay amount throughout the aperture, and a graduated rotating ring and a digital micrometer provide a continuously variable delay amount.

[0040] In one embodiment of the present invention, the beam splitter prism is a broadband depolarizing beam splitter prism with an operating wavelength of 650nm-900nm and a beam splitting ratio T / R=5 / 5.

[0041] In one embodiment of the present invention, the sample pool module is replaced by an optically active dispersion plate, which can simulate the change of the optical activity of the sample.

[0042] In one embodiment of the present invention, the industrial area imaging camera has a resolution of 3008*3008 and a readout noise of 1.0e to 3.8e.

[0043] The present invention has the following advantages:

[0044] 1) The present invention sets two measurement optical paths with different initial working points by comprehensively adjusting the optical rotation modulation module and the post-selection module, so that the system is in the two working intervals at the same time, and then subtracts / divides the corresponding light intensity values ​​in the two working intervals, thereby obtaining higher sensitivity and detection accuracy than that of a single working interval.

[0045] 2) The present invention adopts a planar array detection method, in which each pixel of the planar array is a measurement point, and the optical rotation of the material can be imaged, which greatly improves the detection flux.

[0046] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, belong to the protection scope of the present invention.

Claims

1. A high-precision array optical rotation detection system based on light intensity type weak measurement with dual working intervals, characterized in that: By comprehensively adjusting the optical rotation modulation module and the two-way post-selection modules, two measurement optical paths with different initial working points are set, so that the system is simultaneously in two working intervals where the light intensity changes in opposite directions with the optical rotation.

2. According to claim 1, a high-precision array optical rotation detection system based on light intensity type weak measurement with dual working intervals is characterized in that: It also includes a light source module, a front selection module, a sample pool module, a spectroscopic module and two-way detection modules; wherein the light emitted by the light source is pre-selected by the front selection module, then divided into two paths by the spectroscopic module after passing through the optical rotation modulation module and the sample pool, then post-selected by the post-selection module, and finally recorded by the two detection modules respectively; wherein the optical rotation modulation module is used to introduce the initial optical rotation, and is combined with the post-selection module to jointly modulate the two detection modules, which are respectively located in two working intervals where the light intensity changes with the optical rotation in opposite directions.

3. According to claim 2, a high-precision array optical rotation detection system based on light intensity type weak measurement with dual working intervals is characterized in that: The light source module comprises a light source (1) and a collimator (2); the optical rotation modulation module comprises a Soleil-Babinet compensator (3); the front selection module comprises a front selection polarizer (4) and an optical rotation dispersion plate (5); the light splitting module comprises a light splitting prism (6); the two-way rear selection module comprises a rear selection polarizer (7), a rear selection polarizer (11), a double glued lens (8), and a double glued lens (12); the two-way detection module comprises a sleeve (9), an industrial camera (10), a sleeve (13) and an industrial camera (14); wherein the light path is emitted from the light source (1), collimated by the collimator (2) and then , an initial optical rotation is introduced by a Soleil-Babinet compensator (3), and then the collimated light path is pre-selected by a pre-selective polarizer (4); the pre-selected light path passes through a sample cell replaced by an optical rotation dispersion plate (5), and is then divided into two light beams by a beam splitter (6), and then post-selected by two post-selective polarizers (7) and a post-selective polarizer (11), respectively, and finally passed through two double-cemented lenses (8) and a double-cemented lens (12) and recorded by an industrial camera, wherein the double-cemented lens (8) is recorded on an industrial camera (10); and the double-cemented lens (12) is recorded on an industrial camera (14).

4. According to claim 3, a high-precision array optical rotation detection system based on light intensity type weak measurement with dual working intervals is characterized in that: The light sources used include super luminescent diodes (SLDs), light emitting diodes (LEDs), and the wavelength bands include near infrared light and visible light.

5. According to claim 3, a high-precision array optical rotation detection system based on light intensity type weak measurement with dual working intervals is characterized in that: The light pre-selected by the front selection module includes linearly polarized light, circularly polarized light and elliptically polarized light.

6. The high-precision area array optical rotation detection system based on light intensity type weak measurement dual working intervals according to claim 3 is characterized in that: The detection sample pool to be imaged is an optically active substance.

7. A high-precision array optical rotation detection method based on light intensity type weak measurement with dual working intervals, using any system described in claims 1 to 6, characterized in that: include: The dual working intervals are two intervals in the light intensity type weak measurement theory that are close to linear and in which the light intensity changes oppositely with the optical rotation; in one interval, the light intensity increases with the increase of the optical rotation of the material, and in the other interval, the light intensity decreases with the increase of the optical rotation of the material; based on this characteristic, two measurement optical paths with different initial working points are set by comprehensively adjusting the optical rotation modulation module and the post-selection module, so that the system is in the two working intervals at the same time, and then the corresponding light intensity values ​​in the two working intervals are subtracted / divided, so as to obtain higher sensitivity and detection accuracy than that of a single working interval.

8. The high-precision array optical rotation detection method based on light intensity type weak measurement dual working intervals according to claim 7 is characterized in that: Includes the following: 1) Screening and recording of light sources: The light emitted by the light source is pre-selected by the front selection module, then divided into two paths by the light splitting module after passing through the optical rotation modulation module and the sample cell, then post-selected by the post-selection module, and finally recorded by the two detection modules respectively; 2) Data processing part: preprocessing of two-way images, registration of two-way images, subtraction / division of two-way images, data calibration and calculation of optical rotation; the two light intensity images obtained by the two detection modules are preprocessed by noise reduction, target area interception, etc., and then the two light intensity images are registered to obtain point-to-point light intensity registration images; Subtracting / dividing the two registered intensity images to obtain a single difference / ratio image, and converting the difference / ratio image into an optical rotation image according to a calibration curve; And collect multiple images to calculate the average value, and take the average value of adjacent pixels in the same image to improve the detection accuracy; The data calibration includes: drawing a dual-interval light intensity change diagram through imaging data, finding the corresponding working intervals in the light intensity change diagram of the two intervals, and taking the intersection of the two working intervals. This range is the interval that can be used for high-precision and high-sensitivity measurement; compared with a single measurement interval, the two working intervals are combined to obtain a linear measurement interval with higher sensitivity.

9. The high-precision array optical rotation detection method based on light intensity type weak measurement dual working intervals according to claim 8 is characterized in that: The functions of the optical rotation modulation module include: the optical rotation modulation module is used to introduce the initial optical rotation, and combined with the rear selection module to jointly modulate the two detection modules located in two working intervals where the light intensity changes oppositely with the optical rotation; the detection method of the detection module includes: the detection module adopts area array imaging, which can realize the simultaneous measurement of the optical rotation of a certain area.

10. The high-precision array optical rotation detection method based on light intensity type weak measurement dual working intervals according to claim 8, characterized in that: The data recorded by the detection module is of light intensity type. During data processing, the change in optical rotation is calculated by the change in light intensity to obtain the optical rotation data of the detected substance.

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