CN112859402A - Phase response acceleration method and acceleration system for liquid crystal variable phase delayer - Google Patents
Phase response acceleration method and acceleration system for liquid crystal variable phase delayer Download PDFInfo
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- CN112859402A CN112859402A CN202110061994.8A CN202110061994A CN112859402A CN 112859402 A CN112859402 A CN 112859402A CN 202110061994 A CN202110061994 A CN 202110061994A CN 112859402 A CN112859402 A CN 112859402A
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
The invention discloses a method and a system for accelerating the phase response of a liquid crystal variable phase delayer. Light emitted by the light source penetrates through the liquid crystal variable phase delayer and is collected by the photoelectric detector; the photoelectric detector converts the collected optical signal into a voltage signal and outputs the voltage signal to the processor; the processor is connected with the liquid crystal variable phase delayer. Respectively obtaining the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer, determining an acceleration voltage value range and an acceleration time value range, performing combination traversal on the acceleration voltage and the acceleration time, and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time in all combinations is the minimum value as an acceleration parameter. The acceleration voltage is switched to, and after the acceleration time is waited, the target phase voltage is switched to, so that the phase switching time of the liquid crystal variable phase delayer can be greatly reduced, and the purpose of acceleration is achieved.
Description
Technical Field
The invention relates to the field of liquid crystal optical device application, in particular to a phase response acceleration method and system of a liquid crystal variable phase retarder.
Background
A Liquid Crystal Variable Retarder (Liquid Crystal Variable Retarder) is a device that achieves phase retardation of light by voltage-controlling the refractive index of Liquid Crystal molecules. The liquid crystal variable phase retarder consists of an upper glass substrate, an upper conductive film, an upper phase matching film, liquid crystal, a lower phase matching film, a lower conductive film and a lower glass substrate from top to bottom in sequence. The alignment orientation of the liquid crystal molecules is controlled by the rubbing angle on the phase matching film. After AC voltage is applied to the upper and lower conductive films, the liquid crystal molecules start to rotate according to the magnitude of the applied voltage, so that the phase difference between the fast and slow axes of the incident polarized light beam can be changed. When the voltage is zero, the delayer has an initial large phase delay amount; as the voltage increases, the liquid crystal molecular orientation gradually rotates, so that the phase retardation amount decreases and approaches zero.
The phase response time of a liquid crystal variable phase retarder depends on several parameters of the liquid crystal layer thickness, viscosity, temperature, direction of retardation change, driving voltage change and liquid crystal material. The phase response time is proportional to the square of the thickness of the liquid crystal layer. At higher temperatures, the viscosity of the material decreases, also contributing to a faster reaction. The response time also depends on the direction of the retardation change, and if the phase retardation increases, the response time is completely determined by the mechanical relaxation of the liquid crystal molecules. If the phase retardation value decreases, the voltage across the liquid crystal layer increases. The higher the voltage of the liquid crystal layer is, the stronger the electric field is, the larger the electric field force borne by the liquid crystal molecules is, and the faster the response speed is. Response times can also be improved using tailored materials with high birefringence.
However, there is currently no good solution for the reduction of the phase response time of the manufactured liquid crystal variable phase retarder.
Disclosure of Invention
The invention aims to: in view of the above existing problems, a method and system for accelerating the phase response of a liquid crystal variable phase retarder are provided to reduce the phase response time when the liquid crystal variable phase retarder is switched from a current limit voltage to a target phase voltage without characterizing the liquid crystal variable phase retarder itself.
The technical scheme adopted by the invention is as follows:
a liquid crystal variable phase delayer phase response acceleration method, this acceleration method is realized on the basis of the detection system of phase response, the said phase response detection system includes detecting the platform, processor, light source, photodetector; light rays emitted by the light source penetrate through the liquid crystal variable phase retarder and are collected by the photoelectric detector; the photoelectric detector converts the collected optical signals into voltage signals and outputs the voltage signals to the processor; the processor is connected with the liquid crystal variable phase delayer;
on the basis, the acceleration method comprises the following steps:
respectively acquiring the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer;
if the current phase voltage is smaller than the target phase voltage, determining the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage; if the current phase voltage is larger than the target phase voltage, determining that the value range of the accelerating voltage is zero to the target phase voltage;
determining an acceleration time value range, combining the preset acceleration voltage step length and the preset acceleration time step length, and respectively executing the following processes corresponding to various combinations:
setting a liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring a calculation reference value of data output by a photoelectric detector;
setting a liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching;
setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time;
acquiring an output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time;
and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value in all the combinations of the acceleration voltage and the acceleration time as acceleration parameters. The combination of the acceleration voltage and the acceleration time is the combination of all possible values of the acceleration voltage and the acceleration time in the value range of the acceleration voltage and the value range of the acceleration time.
The acceleration voltage and the acceleration time are obtained through the acceleration parameters obtained by the scheme, the acceleration voltage is switched to before the current phase voltage is switched to the target phase voltage, the acceleration time is waited, and then the target phase voltage is switched to, and after the acceleration, the phase switching time of the liquid crystal variable phase delayer can be greatly reduced.
Furthermore, the detection platform consists of an upper part and a lower part, the lower part is a sealed shading box for installing the photoelectric detector, and the upper part of the sealed shading box is provided with a liquid crystal variable phase retarder; the top of the sealed shading box is provided with a light through hole corresponding to the position where the liquid crystal variable phase retarder is arranged; the upper part of the detection table is provided with a support for fixedly mounting the light source.
Further, the method for determining whether the output value is stable at the reference value includes: comparing the samples of the output values of a plurality of times with a reference value in sequence, and finding an index of the last sampling value with an error larger than a first threshold value; and taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
Further, the acquiring of the photodetector output data calculates a reference value, including: and continuously acquiring output values of a plurality of groups of the photoelectric detectors to average the output values as reference values.
The invention also provides a phase response accelerating system of the liquid crystal variable phase delayer, which comprises a detection table, a processor, a light source and a photoelectric detector; light rays emitted by the light source penetrate through the liquid crystal variable phase retarder and are collected by the photoelectric detector; the photoelectric detector converts the collected optical signals into voltage signals and outputs the voltage signals to the processor; the processor is connected with the liquid crystal variable phase delayer;
the processor is configured to perform the following operations:
respectively acquiring the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer;
when the current phase voltage is smaller than the target phase voltage, setting the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage; when the current phase voltage is greater than the target phase voltage, setting the value range of the accelerating voltage to be zero to the target phase voltage;
receiving a set acceleration time value range, combining a preset acceleration voltage step length and a preset acceleration time step length, and respectively executing the following processes corresponding to various combinations:
setting a liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring a calculation reference value of data output by a photoelectric detector;
setting a liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching;
setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time;
acquiring an output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time;
and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value in all the combinations of the acceleration voltage and the acceleration time as acceleration parameters.
Furthermore, the detection platform consists of an upper part and a lower part, the lower part is a sealed shading box for installing the photoelectric detector, and the upper part of the sealed shading box is provided with a liquid crystal variable phase retarder; the top of the sealed shading box is provided with a light through hole corresponding to the position where the liquid crystal variable phase retarder is arranged; the upper part of the detection table is provided with a support for fixedly mounting the light source.
Further, the method for determining whether the output value is stable at the reference value includes: comparing the samples of the output values of a plurality of times with a reference value in sequence, and finding an index of the last sampling value with an error larger than a first threshold value; and taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
Further, the acquiring of the photodetector output data calculates a reference value, including: and continuously acquiring output values of a plurality of groups of the photoelectric detectors to average the output values as reference values.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the acceleration parameters obtained by the acceleration scheme of the invention are switched to the acceleration voltage before the current phase voltage is switched to the target phase voltage, and then are switched to the target phase voltage after the acceleration time, so that the phase switching time of the liquid crystal variable phase delayer can be greatly reduced, and the acceleration effect is achieved.
2. The detection system used by the invention has high precision of data collected by the photoelectric detector and small influence of environment, so that the detection result and the calculation result are very accurate.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a block diagram of a phase response detection system.
Fig. 2 is a phase response time versus time graph without the use of the acceleration method.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
A phase response acceleration method of a liquid crystal variable phase delayer is realized based on a phase response detection system. Referring to fig. 1, the phase response detection system comprises a detection table, a processor, a light source 4 and a photoelectric detector 6; the detection platform consists of an upper part and a lower part, the lower part is a sealed shading box 2 used for installing a photoelectric detector 6, the sealed shading box 2 is used for preventing external light from influencing the detection precision of the photoelectric detector 6, and a liquid crystal variable phase retarder 5 is arranged at the upper part of the sealed shading box 2; the top of the sealed shading box 2 is provided with a light through hole 7 (such as a round hole) corresponding to the position of the liquid crystal variable phase retarder 5 for transmitting light; the upper part of the detection table is provided with a bracket 3 for fixedly mounting a light source 4.
Light emitted from a light source 4 (such as a point light source) passes through a liquid crystal variable phase retarder 5 and is collected by a photodetector 6. The photodetector 6 converts the optical signal transmitted through the liquid crystal variable phase retarder 5 into a voltage signal, and transmits the voltage signal to a connected processor. The processor is connected to the liquid crystal variable phase retarder 5 for controlling it and acquiring data.
The acceleration method comprises the following steps:
and acquiring the current phase voltage of the liquid crystal variable phase delayer.
And acquiring the phase voltage of the liquid crystal variable phase delayer.
And acquiring a target minimum phase voltage of the liquid crystal variable phase delayer.
And if the current phase voltage is smaller than the target phase voltage, determining the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage.
And if the current phase voltage is larger than the target phase voltage, determining that the value range of the accelerating voltage is zero to the target phase voltage.
Determining an acceleration time value range, combining the preset acceleration voltage step length and the preset acceleration time step length, and respectively executing the following processes by various combinations:
and setting the liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring the output data calculation reference value of the photoelectric detector. The data obtained by averaging the output values of several consecutive sets of photodetectors can be taken as the reference value.
And setting the liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching.
And setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time.
And acquiring the output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time.
And traversing all combinations of the acceleration voltage value range and the acceleration time value range, and recording the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value as acceleration parameters. And taking the recorded acceleration parameters as a basis, switching to the acceleration voltage before switching the liquid crystal variable phase delayer from the current phase voltage to the target phase voltage, and switching to the target phase voltage after waiting for the acceleration time.
In some embodiments, the method of determining whether the output value is stable at the reference value includes:
the samples of the output values of several times are compared with the reference value in sequence, and the index of the last sample value with the error larger than the first threshold value is found. The first threshold is the accuracy error range of the photoelectric detector.
And taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
Example two
The present embodiment takes actual data as an example to describe the acceleration method.
As shown in fig. 1, the phase response detection system used in the present embodiment includes a detection platform, a computer 1, a light source 4, and a silicon photodetector; the detection platform consists of an upper part and a lower part, the lower part is a sealed shading box for mounting a silicon photodetector, and the upper part of the sealed shading box 2 is provided with a liquid crystal variable phase retarder 5; the top of the sealed shading box 2 is provided with a light through hole 7 corresponding to the position where the liquid crystal variable phase retarder 5 is arranged for transmitting light; the upper part of the detection table is provided with a bracket 3 for fixedly mounting a light source 4. The computer 1 is respectively connected with the liquid crystal variable phase delayer 5 and the silicon photodetector through the USB interface, the silicon photodetector converts detected optical signals into voltage signals in real time and outputs the voltage signals to the computer 1, and the computer 1 controls the liquid crystal variable phase delayer 5 to output voltage for the liquid crystal layer through the USB interface. The detection wavelength range of the silicon photodetector is 320-1100 nm.
The acceleration method comprises the following steps:
the liquid crystal variable phase retarder current phase voltage V1 is obtained.
The phase voltage V2 for the liquid crystal variable phase retarder is obtained.
A liquid crystal variable phase retarder target minimum phase voltage Vmax is acquired.
If the current phase voltage is smaller than the target phase voltage, the value range of the accelerating voltage Va is from the target phase voltage V2 to the minimum phase voltage Vmax;
if the current phase voltage is larger than the target phase voltage, the accelerating voltage Va ranges from zero to the target phase voltage V2.
The acceleration time Ta ranges from 0ms to 20 ms. According to the combination of the acceleration voltage step of 50mv and the acceleration time step of 1ms, each combination carries out the following 4 steps:
setting a liquid crystal variable phase delayer to work at a target phase voltage V2, and continuously acquiring the output value of the silicon photodetector 1000 times (once in 1 ms) to average after the liquid crystal is stabilized for 1000ms to serve as a stable reference value Vs;
and setting the liquid crystal variable phase delayer to work at the current phase voltage V1, and waiting for 1000ms for the liquid crystal to be stable.
And setting the liquid crystal variable phase delayer to work at the current accelerating voltage Va, and after waiting for the accelerating time Ta, setting the liquid crystal variable phase delayer to work at the target phase voltage V2.
The output value of the silicon photodetector is continuously acquired 1000 times (once in 1 ms), and the time when the output value is stabilized at the reference value Vs is recorded as the stabilization time Ts.
In each combination, the acceleration voltage Va and the acceleration time Ta when the sum of the acceleration time Ta and the stabilization time Ts is the minimum value are taken as the acceleration parameters. Based on the recorded acceleration parameters (acceleration voltage Va and acceleration time Ta), the liquid crystal variable phase retarder is switched to the acceleration voltage Va before being switched to the target phase voltage V2 from the current phase voltage V1, and is switched to the target phase voltage V2 after waiting for the acceleration time Ta.
As shown in fig. 2, it was proved through experiments that when the above acceleration method is used, the phase response is 89ms when the acceleration method is not used, and only 8ms is needed when the acceleration method is used, and the current phase voltage is switched from 2373mv to the target phase voltage 2402 mv.
Corresponding to the acceleration method, the method for judging whether the output value of the detector is stabilized at the reference value Vs includes:
the 1000 sampled values (sampled at 1ms for the output value of the silicon photodetector) are compared in turn with the reference value Vs, finding the last data index with an error greater than 50. Error 50 is the self-accuracy error range of the silicon photodetector, and when other photodetectors are used, the error (first threshold) can be adjusted accordingly.
On the basis of the steps, 10 continuous sampling values after the index starts are taken to be subjected to sliding window averaging and compared with a stable voltage Vs, if the error is smaller than 10, the stable voltage is judged, and the corresponding time of the recorded data index is taken as the stable time Ts. The average error 10 is used to determine whether the sampled data is stable, and may be set as another second threshold.
EXAMPLE III
The embodiment discloses a phase response accelerating system of a liquid crystal variable phase delayer, which comprises a detection table, a processor, a light source and a photoelectric detector; light emitted by the light source penetrates through the liquid crystal variable phase delayer and is collected by the photoelectric detector; the photoelectric detector converts the collected optical signal into a voltage signal and outputs the voltage signal to the processor; the processor is connected with the liquid crystal variable phase delayer.
As shown in fig. 1, in some embodiments, the system includes a detection station, a processor, a light source 4, a photodetector 6; the detection platform consists of an upper part and a lower part, the lower part is a sealed shading box 2 used for installing a photoelectric detector 6, the sealed shading box 2 is used for preventing external light from influencing the detection precision of the photoelectric detector 6, and a liquid crystal variable phase retarder 5 is arranged at the upper part of the sealed shading box 2; the top of the sealed shading box 2 is provided with a light through hole 7 (such as a round hole) corresponding to the position of the liquid crystal variable phase retarder 5 for transmitting light; the upper part of the detection table is provided with a bracket 3 for fixedly mounting a light source 4. The light source 4 may be a point light source and the photodetector 6 may be a silicon photodetector.
The processor is configured to perform the following operations:
the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer 5 are respectively obtained.
When the current phase voltage is smaller than the target phase voltage, setting the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage; and when the current phase voltage is greater than the target phase voltage, setting the value range of the accelerating voltage to be zero to the target phase voltage.
Receiving a set acceleration time value range; taking values in an acceleration voltage value range by a preset acceleration voltage step length, taking values in an acceleration time range by a preset acceleration time step length, combining the taken acceleration voltage and acceleration time, and respectively executing the following processes corresponding to various combinations:
setting a liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring a calculation reference value of data output by a photoelectric detector;
setting a liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching;
setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time;
acquiring an output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time;
and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value in all the combinations of the acceleration voltage and the acceleration time as acceleration parameters. And taking the recorded acceleration parameters as a basis, switching to the acceleration voltage before switching the liquid crystal variable phase delayer from the current phase voltage to the target phase voltage, waiting for acceleration time, and switching to the target phase voltage to achieve the purpose of acceleration.
In some embodiments, the method of determining whether the output value is stable at the reference value includes:
the samples of the output values of several times are compared with the reference value in sequence, and the index of the last sample value with the error larger than the first threshold value is found. The first threshold is the accuracy error range of the photoelectric detector.
And taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
In some embodiments, a method of acquiring photodetector output data to calculate a reference value comprises: and continuously acquiring output values of a plurality of groups of the photoelectric detectors to average the output values as reference values.
Example four
The present embodiment exemplifies the flow executed by the processor with actual parameters:
the liquid crystal variable phase retarder current phase voltage V1 is obtained.
The phase voltage V2 for the liquid crystal variable phase retarder is obtained.
A liquid crystal variable phase retarder target minimum phase voltage Vmax is acquired.
If the current phase voltage is smaller than the target phase voltage, the value range of the accelerating voltage Va is from the target phase voltage V2 to the minimum phase voltage Vmax;
if the current phase voltage is larger than the target phase voltage, the accelerating voltage Va ranges from zero to the target phase voltage V2.
The acceleration time Ta ranges from 0ms to 20 ms. In the value range of the acceleration voltage Va and the value range of the acceleration time Ta, according to the combination of the acceleration voltage step length of 50mv and the acceleration time step length of 1ms, respectively executing the following 4 steps for each combination:
setting a liquid crystal variable phase delayer to work at a target phase voltage V2, and continuously acquiring the output value of the silicon photodetector 1000 times (once in 1 ms) to average after the liquid crystal is stabilized for 1000ms to serve as a stable reference value Vs;
and setting the liquid crystal variable phase delayer to work at the current phase voltage V1, and waiting for 1000ms for the liquid crystal to be stable.
And setting the liquid crystal variable phase delayer to work at the current accelerating voltage Va, and after waiting for the accelerating time Ta, setting the liquid crystal variable phase delayer to work at the target phase voltage V2.
The output value of the silicon photodetector is continuously acquired 1000 times (once in 1 ms), and the time when the output value is stabilized at the reference value Vs is recorded as the stabilization time Ts.
In each combination, the acceleration voltage Va and the acceleration time Ta when the sum of the acceleration time Ta and the stabilization time Ts is the minimum value are taken as the acceleration parameters. Based on the recorded acceleration parameters (acceleration voltage Va and acceleration time Ta), the liquid crystal variable phase retarder is switched to the acceleration voltage Va before being switched to the target phase voltage V2 from the current phase voltage V1, and is switched to the target phase voltage V2 after waiting for the acceleration time Ta.
As shown in fig. 2, it was proved through experiments that when the above acceleration method is used, the phase response is 89ms when the acceleration method is not used, and only 8ms is needed when the acceleration method is used, and the current phase voltage is switched from 2373mv to the target phase voltage 2402 mv.
Corresponding to the acceleration method, the method for judging whether the output value of the detector is stabilized at the reference value Vs includes:
the 1000 sampled values (sampled at 1ms for the output value of the silicon photodetector) are compared in turn with the reference value Vs, finding the last data index with an error greater than 50. Error 50 is the self-accuracy error range of the silicon photodetector, and when other photodetectors are used, the error (first threshold) can be adjusted accordingly.
On the basis of the steps, 10 continuous sampling values after the index starts are taken to be subjected to sliding window averaging and compared with a stable voltage Vs, if the error is smaller than 10, the stable voltage is judged, and the corresponding time of the recorded data index is taken as the stable time Ts. The average error 10 is used to determine whether the sampled data is stable, and may be set as another second threshold.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (8)
1. A liquid crystal variable phase delayer phase response acceleration method, this acceleration method is realized on the basis of the detection system of phase response, the said phase response detection system includes detecting the platform, processor, light source, photodetector; light rays emitted by the light source penetrate through the liquid crystal variable phase retarder and are collected by the photoelectric detector; the photoelectric detector converts the collected optical signals into voltage signals and outputs the voltage signals to the processor; the processor is connected with the liquid crystal variable phase delayer;
the acceleration method is characterized by comprising the following steps:
respectively acquiring the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer;
if the current phase voltage is smaller than the target phase voltage, determining the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage; if the current phase voltage is larger than the target phase voltage, determining that the value range of the accelerating voltage is zero to the target phase voltage;
determining an acceleration time value range, combining the preset acceleration voltage step length and the preset acceleration time step length, and respectively executing the following processes corresponding to various combinations:
setting a liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring a calculation reference value of data output by a photoelectric detector;
setting a liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching;
setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time;
acquiring an output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time;
and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value in all the combinations of the acceleration voltage and the acceleration time as acceleration parameters.
2. The method for accelerating the phase response of a liquid crystal variable phase retarder according to claim 1, wherein the inspection stage is composed of an upper part and a lower part, the lower part is a sealed light-shielding box for mounting the photodetector, and the upper part of the sealed light-shielding box is provided with the liquid crystal variable phase retarder; the top of the sealed shading box is provided with a light through hole corresponding to the position where the liquid crystal variable phase retarder is arranged; the upper part of the detection table is provided with a support for fixedly mounting the light source.
3. The method for accelerating the phase response of a liquid crystal variable phase retarder of claim 1, wherein the method for determining whether the output value is stabilized at the reference value comprises:
comparing the samples of the output values of a plurality of times with a reference value in sequence, and finding an index of the last sampling value with an error larger than a first threshold value;
and taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
4. The liquid crystal variable phase retarder phase response acceleration method of claim 1, wherein the acquiring photodetector output data calculation reference values comprises:
and continuously acquiring output values of a plurality of groups of the photoelectric detectors to average the output values as reference values.
5. A liquid crystal variable phase delayer phase response acceleration system is characterized by comprising a detection table, a processor, a light source and a photoelectric detector; light rays emitted by the light source penetrate through the liquid crystal variable phase retarder and are collected by the photoelectric detector; the photoelectric detector converts the collected optical signals into voltage signals and outputs the voltage signals to the processor; the processor is connected with the liquid crystal variable phase delayer;
the processor is configured to perform the following operations:
respectively acquiring the current phase voltage, the target phase voltage and the target minimum phase voltage of the liquid crystal variable phase delayer;
when the current phase voltage is smaller than the target phase voltage, setting the value range of the accelerating voltage as the target phase voltage to the target minimum phase voltage; when the current phase voltage is greater than the target phase voltage, setting the value range of the accelerating voltage to be zero to the target phase voltage;
receiving a set acceleration time value range, combining a preset acceleration voltage step length and a preset acceleration time step length, and respectively executing the following processes corresponding to various combinations:
setting a liquid crystal variable phase delayer to work at a target phase voltage, waiting for the completion of phase switching, and acquiring a calculation reference value of data output by a photoelectric detector;
setting a liquid crystal variable phase delayer to work at the current phase voltage, and waiting for the completion of phase switching;
setting the liquid crystal variable phase delayer to work at the current accelerating voltage, and setting the liquid crystal variable phase delayer to work at the target phase voltage after waiting for the accelerating time;
acquiring an output value of the photoelectric detector, and recording the time when the output value is stabilized at the reference value as the stabilization time;
and taking the acceleration voltage and the acceleration time when the sum of the acceleration time and the stabilization time is at the minimum value in all the combinations of the acceleration voltage and the acceleration time as acceleration parameters.
6. The liquid crystal variable phase retarder phase response accelerating system of claim 5, wherein the detecting table is composed of an upper portion and a lower portion, the lower portion is a sealed light shielding box for mounting the photodetector, and the upper portion of the sealed light shielding box is used for placing the liquid crystal variable phase retarder; the top of the sealed shading box is provided with a light through hole corresponding to the position where the liquid crystal variable phase retarder is arranged; the upper part of the detection table is provided with a support for fixedly mounting the light source.
7. The liquid crystal variable phase retarder phase response accelerating system of claim 5, wherein the method of determining whether the output value is stabilized at the reference value includes:
comparing the samples of the output values of a plurality of times with a reference value in sequence, and finding an index of the last sampling value with an error larger than a first threshold value;
and taking a plurality of continuous sampling values after the index starts to perform sliding window averaging, comparing the sampling values with a reference value, and if the error is smaller than a second threshold value, determining that the sampling values are stable at the reference value.
8. The liquid crystal variable phase retarder phase response acceleration system of claim 5, wherein the obtaining photodetector output data calculation reference values comprises:
and continuously acquiring output values of a plurality of groups of the photoelectric detectors to average the output values as reference values.
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