A high-speed control method for color separation and filtering

Abstract

This application provides a high-speed control method for color separation filtering, belonging to the technical field of photoelectric detection. The method specifically includes the following steps: first, sending a trigger signal to the color separation filter assembly; after receiving the trigger signal, the color separation filter assembly drives the light transmission starting point on the color separation filter wheel to align with the lens of the infrared detector within a preset time; the infrared detector begins to collect images; and periodically sending a trigger signal to the color separation filter assembly, with the period of sending the trigger signal being consistent with the rotation period of the color separation filter wheel. Through the processing scheme of this application, the deviation between the actual position of the color separation filter wheel and the integral position is eliminated, effectively improving the integral position alignment accuracy and imaging quality.

Description

Technical Field

[0001] The present application relates to the field of photoelectric detection, and in particular to a high-speed control method for color separation and filtering. Background Art

[0002] In order to achieve the function of integration in different infrared bands, a color separation filter component is added to the system. The color separation filter component can drive the color separation filter wheel to rotate, achieving the effect of transmitting light of different bands at different positions, so that the system can integrate and image in different bands. The color separation filter component generally adopts the servo external triggering method, that is, after the color separation filter component moves to the specified position, it sends a trigger signal to the infrared system for integral imaging. The servo external triggering control method of the color separation filter component is relatively intuitive and has achieved good control effects, but the servo external triggering method has certain drawbacks. The position alignment accuracy of the servo external triggering method is too dependent on high-speed control accuracy, but high-speed control will inevitably have deviations, which is not conducive to improving imaging quality. Summary of the Invention

[0003] In view of this, the present application provides a high-speed control method for color separation filtering, which solves the problems in the prior art, eliminates the deviation between the actual position and the integral position of the color separation filter wheel, and effectively improves the integral position alignment accuracy and imaging quality.

[0004] The present application provides a high-speed control method for color separation and filtering using the following technical solutions:

[0005] A high-speed control method for color separation and filtering comprises the following steps:

[0006] First, a trigger signal is sent to the color separation filter component;

[0007] After receiving the trigger signal, the color separation filter assembly drives the light transmission starting point on the color separation filter wheel to align with the lens of the infrared detector within a preset time;

[0008] The infrared detector begins to collect images;

[0009] A trigger signal is periodically sent to the color separation filter component, and the period of sending the trigger signal is consistent with the rotation period of the color separation filter wheel.

[0010] Optionally, a trigger signal is sent to the color separation filter component via an infrared detector.

[0011] Optionally, after the color separation filter assembly receives the trigger signal, the specific steps of driving the mark position on the color separation filter wheel to reach a preset position within a preset time include:

[0012] The encoder is used to collect the light transmission starting point position x of the color separation filter component when the color separation filter component receives the trigger signal;

[0013] Calculate the distance a between the collected light transmission starting point x of the color separation filter wheel and the infrared detector;

[0014] The rotation speed of the color separation filter wheel is adjusted according to the distance a, so that the light transmission starting point position of the color separation filter wheel and the lens of the infrared detector are aligned within a preset time.

[0015] Optionally, the preset time is 50-150 μs.

[0016] Optionally, the trigger signal is an LVDS signal.

[0017] Optionally, the color filter wheel includes two filters of different wavelength bands, each filter occupies half of the circle of the color filter wheel, and when the light transmission starting point on the color filter wheel is aligned with the lens of the infrared detector within a preset time, the edge of the lens of the infrared detector is aligned with the dividing line between the two filters.

[0018] In summary, this application has the following beneficial technical effects:

[0019] The infrared detector performs periodic integral imaging. Each time the color filter wheel rotates, it sends a trigger signal to the color filter assembly. This trigger signal is sent before the light transmission starting point reaches the infrared detector's lens position. This time interval is used to adjust the rotation speed of the color filter wheel. Regardless of where the light transmission starting point is when the color filter assembly receives the trigger signal, the light transmission starting point rotates to align with the infrared detector's lens position within a preset time. This ensures that the intervals between the light transmission starting point of the color filter wheel and the infrared detector's lens position are consistent each time the infrared detector performs integral imaging. This eliminates any deviation between the actual position of the filter wheel and the integral position, effectively improving the integral position alignment accuracy and imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of the relative position relationship between the color separation filter wheel and the infrared detector when the application transmits a trigger signal to the color separation filter assembly;

[0022] Figure 2 This is a schematic diagram of the relative position relationship between the color separation filter wheel and the infrared detector when the light transmission starting point of this application is aligned with the lens of the infrared detector.

[0023] Explanation of the accompanying symbols: 1. color separation filter wheel; 2. infrared detector; 3. light transmission starting point. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0026] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0027] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0028] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0029] The embodiments of the present application provide a high-speed control method for color separation and filtering.

[0030] like Figure 1 and Figure 2 As shown, a high-speed control method for color separation and filtering includes the following steps:

[0031] First, a trigger signal is sent to the color separation filter component.

[0032] After receiving the trigger signal, the color separation filter assembly drives the light transmission starting point 2 on the color separation filter wheel 1 to align with the lens of the infrared detector 3 within a preset time, wherein the preset time is 50-150 μs.

[0033] The infrared detector begins to collect images.

[0034] A trigger signal is periodically sent to the color separation filter assembly, and the period of sending the trigger signal is consistent with the rotation period of the color separation filter wheel; each time the trigger signal is sent is before the light transmission starting point reaches the preset position.

[0035] In the embodiment of the present application, an infrared detector is used to send a trigger signal to the color separation filter component. The trigger signal is an LVDS signal.

[0036] After the color separation filter assembly receives the trigger signal, the specific steps of driving the mark position on the color separation filter wheel to reach the preset position within the preset time include:

[0037] The encoder captures the light transmission starting point position x of the color separation filter assembly when the color separation filter assembly receives a trigger signal; the distance a between the captured light transmission starting point position x of the color separation filter wheel and the infrared detector is calculated; and the rotation speed of the color separation filter wheel is adjusted based on the distance a to achieve alignment between the light transmission starting point position of the color separation filter wheel and the lens of the infrared detector within a preset time. The light transmission starting point position x and the center of the infrared detector lens are on the same circle, so the calculated distance a can be a circumferential distance. Specifically, the position of the infrared detector is fixed, and the circumferential distance a can be obtained by simply acquiring the light transmission starting point position x of the color separation filter wheel at the current moment and combining it with the center of the color separation filter wheel.

[0038] The infrared detector performs periodic integral imaging. Each time the color separation filter wheel rotates one circle, a trigger signal is transmitted to the color separation filter assembly. The trigger signal is sent before the light transmission starting point reaches the lens position of the infrared detector. This period of time is used to adjust the rotation speed of the color separation wheel. No matter where the light transmission starting point is when the color separation filter assembly receives the trigger signal, the light transmission starting point is rotated to align with the lens position of the infrared detector within a preset time, so that the time interval for the light transmission starting point of the color separation filter wheel and the lens position of the infrared detector are aligned each time. That is, each time the infrared detector performs integral imaging according to the cycle, the light transmission starting point of the color separation filter wheel and the lens position of the infrared detector are aligned.

[0039] An infrared LVDS trigger signal acquisition module for receiving a trigger signal is provided on the color separation filter component.

[0040] The color filter wheel includes two filters of different wavelength bands, each filter occupies half of the circle of the color filter wheel. When the light transmission starting point on the color filter wheel is aligned with the lens of the infrared detector within a preset time, the edge of the infrared detector lens is aligned with the dividing line between the two filters.

[0041] In one embodiment, the infrared-triggered color separation and filtering high-speed control method uses two controllers: a speed loop and an integral position alignment loop.

[0042] The speed loop performs closed-loop control on the deviation between the speed command and the actual speed, and the controller outputs this to the motor and filter wheel for driving. The integral position alignment loop performs closed-loop control on the deviation between the integral position command and the position at the time of the trigger signal, and the controller outputs the speed fine-tuning value. The speed loop's speed command is obtained by summing the speed reference command with the speed fine-tuning value output by the integral position alignment loop.

[0043] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A high-speed control method for color separation and filtering, characterized in that: The steps include: First, a trigger signal is sent to the color separation filter component; After receiving the trigger signal, the color separation filter assembly drives the light transmission starting point on the color separation filter wheel to align with the lens of the infrared detector within a preset time; The infrared detector begins to collect images; Periodically sending a trigger signal to the color separation filter assembly, and the period of sending the trigger signal is consistent with the rotation period of the color separation filter wheel; A trigger signal is sent to the color filter assembly through the infrared detector. The color filter wheel includes two filters of different wavelengths, each of which occupies half of the color filter wheel. When the light transmission starting point on the color filter wheel is aligned with the lens of the infrared detector within a preset time, the edge of the infrared detector lens is aligned with the dividing line between the two filters. The trigger signal is sent before the light transmission starting point reaches the lens position of the infrared detector, and the rotation speed of the color separation filter wheel is adjusted. No matter where the light transmission starting point is when the color separation filter component receives the trigger signal, the light transmission starting point is rotated to align with the lens position of the infrared detector within the preset time.

2. The high-speed control method for color separation and filtering according to claim 1, characterized in that: After the color separation filter assembly receives the trigger signal, the specific steps of driving the light transmission starting point on the color separation filter wheel to align with the lens of the infrared detector within a preset time include: The encoder is used to collect the light transmission starting point position x of the color separation filter component when the color separation filter component receives the trigger signal; Calculate the distance a between the collected light transmission starting point x of the color separation filter wheel and the infrared detector; The rotation speed of the color separation filter wheel is adjusted according to the distance a, so that the light transmission starting point position of the color separation filter wheel and the lens of the infrared detector are aligned within a preset time.

3. The high-speed control method for color separation and filtering according to claim 1, wherein: The preset time is 50-150μs.

4. The high-speed control method for color separation and filtering according to claim 1, wherein: The trigger signal is an LVDS signal.

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