Automatic variable diaphragm mechanism for infrared sensitivity test and adjustment test method
By designing an automatic variable aperture mechanism, the size of the light-through area is automatically adjusted by using the servo motor and screw system, the problems of low manual adjustment efficiency and low accuracy in the existing technology are solved, and efficient and accurate automation of infrared sensitivity testing is achieved. .
Patent Information
- Application Number
- CN202411638335.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-16
- Publication Date
- 2025-02-18
AI Technical Summary
During the existing infrared sensitivity test, the fan angle, measurement angle, calculation results, and recording results need to be manually adjusted multiple times, resulting in low efficiency and low accuracy of the manual angle of interpretation, which is easy to introduce measurement errors.
Design an automatic variable aperture mechanism, including two parallel diaphragm baffles and driving components, automatically adjust the size of the light-transmissible area through the servo motor and screw system, and calculate the light-transmissible area through the ruler to establish the light-transmissible area. The correspondence between the area area and the rotation angle of the servo motor is written into the control program of the servo motor controller.
It realizes continuous automatic adjustment of the light-through area, improves the efficiency and accuracy of infrared sensitivity testing, and reduces artificial errors.
Smart Images
Figure CN119469683A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of optical testing, and in particular to an automatic variable iris mechanism for infrared sensitivity testing and an adjustment and testing method. Background Art
[0002] The detection distance index is one of the important technical indicators of infrared optical systems. When testing and evaluating the detection distance performance in the laboratory, the conversion method is usually used to convert the distance index into an infrared sensitivity index that can be measured in the laboratory. In the laboratory, the black body + collimator + variable aperture method is often used to provide different infrared target irradiances for the infrared products being tested.
[0003] During the test, it is necessary to adjust the light passing area of the variable iris to test the product's limit detection capability or the specified detection capability. In the previous test process, a sector-shaped manual variable iris mechanism as shown in Figure 4 was usually used to obtain different light passing areas by adjusting the sector angle of the two semicircular baffles. During the test process, it is necessary to manually adjust the sector angle, measure the angle, calculate the results, and record the results many times. On the one hand, the efficiency is low, and on the other hand, the accuracy of manual angle interpretation is not high, which is easy to introduce measurement errors.
[0004] Therefore, it is necessary to provide an automatic variable aperture mechanism and an adjustment test method for infrared sensitivity testing to solve the above problems. Summary of the invention
[0005] The present invention provides an automatic variable iris mechanism and an adjustment test method for infrared sensitivity testing, so as to solve the problem that the existing test process needs to manually adjust the sector angle, measure the angle, calculate the result, and record the result for many times, which is inefficient on the one hand and the accuracy of manual angle judgment is low on the other hand, which is easy to introduce measurement errors.
[0006] An automatic variable aperture mechanism for infrared sensitivity testing of the present invention adopts the following technical solution, including: Two aperture baffles, the two aperture baffles are arranged in parallel, and both are processed with light-through holes, and the overlapping parts of the two light-through holes form an area to form a light-through area; And a driving component, which is used for driving the two aperture baffles to move so as to adjust the size of the light-transmitting area.
[0007] Preferably, the drive assembly comprises: Servo motors and servo motor controllers; A screw rod is connected to the output end of the servo motor, and is provided with two threaded sections with opposite rotation directions; Two nut connection blocks, correspondingly threadedly connected to the threaded section of the screw rod, wherein each nut connection block is fixedly connected to the bottom of an aperture baffle through an adapter plate; And a guide component is used for guiding the nut connecting block along the axial direction of the screw rod.
[0008] Preferably, the screw rod is horizontally mounted via two limiting support blocks, and the screw rod is connected to the corresponding limiting support block via a bearing.
[0009] Preferably, the guide assembly comprises: a guide rail plate, the guide rail plate is connected between the limiting support blocks, and the guide rail plate is slidably connected to the corresponding side surfaces of the nut connecting block.
[0010] Preferably, the light-through hole is a rectangular light-through hole, and the diagonals of the rectangular light-through holes of the two aperture baffles are parallel in the horizontal plane, one edge of each rectangular light-through hole is provided with a ruler, and the rulers of the two rectangular light-through holes are provided on two adjacent edges of the two rectangular light-through holes, and the two rulers are used to calculate the area size of the light-through area.
[0011] Preferably, when the rectangular light-through hole is a square light-through hole, a scale is provided on one edge of a square light-through hole of the aperture baffle located on the outside.
[0012] A calibration and testing method for an automatic variable aperture mechanism for infrared sensitivity testing, comprising: The servo motor controller is used to drive the servo motor to rotate, so that the nut connecting block on the screw rod drives the corresponding two aperture baffles to move in the opposite direction to the corresponding limit support block, and this place is recorded as the movement zero position; Drive the servo motor to rotate. When the diagonal vertices of the square light openings of the two aperture baffles coincide, it is recorded as the position where the light passing area is 0, and the rotation angle of the servo motor relative to the zero position of movement is recorded; The two aperture baffles are driven to move by a servo motor to adjust and increase the size of the light-transmitting area, and the two side lengths of the light-transmitting area are read by a ruler, and the area of the light-transmitting area is calculated, and the corresponding rotation angle of the servo motor when the area of the light-transmitting area is different is recorded; According to the recorded areas of the plurality of light-transmitting regions and the rotation angles of the plurality of corresponding servo motors, a corresponding relationship between the areas of the light-transmitting regions and the rotation angles of the servo motors is established; The corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor is written into the control program of the servo motor controller; When conducting an infrared sensitivity test, the required light-transmitting area is input into the control program, which automatically calculates the rotation angle.
[0013] Preferably, the adjustment steps for the position where the light transmission area is 0 are: placing a flashlight on one side of the two aperture baffles, and observing on the other side, and the position where the light just disappears is the position where the light transmission area is 0.
[0014] Preferably, the steps for determining the correspondence between the area of the light-transmitting region and the rotation angle of the servo motor are as follows: The least square method is used to calculate the linear coefficient and constant term of the light-transmitting area and the square of the rotation angle of the servo motor; Obtaining a corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor based on the linear coefficient and the constant term; Among them, the relationship is:
[0015] In the formula, Indicates the area of the light-transmitting region; Indicates the rotation angle of the servo motor; represents the linear coefficient; Represents a constant term.
[0016] The beneficial effects of the present invention are: The servo motor controller, servo motor, screw, guide assembly and two aperture baffles with light openings are used to realize continuous automatic adjustment of the light area. During the calibration test, the light area is continuously adjusted to establish a corresponding relationship between the light area and the rotation angle of the servo motor. Then, the relationship is written into the control program of the servo motor controller. When in use, the required light area is input, and the automatic adjustment of the light area can be completed through the program control of the servo motor controller, so as to assist in the full process automatic test of infrared sensitivity and improve the test efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a schematic diagram of the overall structure of an automatic variable aperture mechanism for infrared sensitivity testing of the present invention; Figure 2 It is a partial structural schematic diagram of an automatic variable aperture mechanism for infrared sensitivity testing of the present invention; Figure 3 for Figure 1 Side view of Figure 4 It is a structural schematic diagram of a fan-shaped manual variable aperture mechanism in the prior art.
[0019] In the figure: 1. servo motor; 2. first aperture baffle; 3. second aperture baffle; 4. first limit support block; 5. first nut connecting block; 6. first adapter plate; 7. second nut connecting block; 8. second adapter plate; 9. guide plate; 10. second limit support block; 11. first bearing; 12. screw; 13. second bearing; 14. servo motor controller. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] An embodiment of an automatic variable aperture mechanism and an adjustment test method for infrared sensitivity testing of the present invention is as follows: Figure 1 and Figure 2 As shown, it includes: a driving component, a first aperture baffle 2 and a second aperture baffle 3, the first aperture baffle 2 and the second aperture baffle 3 are arranged in parallel, the first aperture baffle 2 and the second aperture baffle 3 are both processed with light-through holes, and the overlapping part of the two light-through holes constitutes a light-through area; the driving component is used to drive the two aperture baffles to move to adjust the size of the light-through area.
[0022] Specifically, in order to obtain the area of the light-transmitting area, such as Figure 1 As shown, in this embodiment, the light-through hole is a square light-through hole, and the diagonals of the square light-through holes of the two aperture baffles are parallel in the horizontal plane. Since the square light-through holes have equal side lengths, the light-through area formed when the two square light-through holes overlap is always a square, which facilitates the calculation of the area of the light-through area. In this embodiment, a ruler is set on one of the edges of the square light-through hole of each aperture baffle, and the area of the light-through area is calculated by the ruler; when the light-through hole is a rectangular light-through hole, the diagonals of the rectangular light-through holes of the two aperture baffles are parallel in the horizontal plane, and a ruler is set on one of the edges of each rectangular light-through hole. The rulers of the two rectangular light-through holes are set on the two adjacent edges of the two rectangular light-through holes, and the two rulers are used to calculate the area of the light-through area.
[0023] Specifically, the driving assembly in this embodiment includes: a servo motor 1, a servo motor controller 14, a screw 12, a first nut connecting block 5, a second nut connecting block 7 and a guide assembly, wherein the servo motor controller 14 is used to control the operation of the servo motor 1, the screw 12 is rotatably mounted through the first limit support block 4 and the second limit support block 10, one end of the screw 12 is connected to the output shaft of the servo motor 1 through a coupling, and two threaded sections with opposite rotation directions are provided on the screw 12; the first nut connecting block 5 and the second nut connecting block 7 are correspondingly connected to the two threaded sections of the screw 12, such as Figure 1 and Figure 3 As shown, the first nut connecting block 5 is fixedly connected to the bottom of the second aperture baffle 3 through the first connecting plate 6, and the second nut connecting block 7 is fixedly connected to the bottom of the first aperture baffle 2 through the second connecting plate 8; the guide assembly is used to guide the nut connecting block along the axial direction of the screw rod 12.
[0024] Among them, the limiting assembly includes: a guide plate 9, the guide plate 9 is connected between the limiting support blocks, and the guide plate 9 is slidingly connected to the corresponding side surfaces of the nut connecting blocks to ensure that the two nut connecting blocks can only move along the axial direction of the screw rod 12.
[0025] One end of the screw rod 12 is rotatably connected to the first position-limiting support block 4 via a first bearing 11 , and the other end of the screw rod 12 is rotatably connected to the first position-limiting support block 10 via a second bearing 13 .
[0026] A calibration and testing method for an automatic variable aperture mechanism for infrared sensitivity testing, comprising: Step 1: drive the servo motor 1 to rotate by the servo motor controller 14, so that the nut connecting block on the screw rod 12 drives the corresponding two aperture baffles to move in the opposite direction to the corresponding limit support blocks, and record this place as the movement zero position.
[0027] Step 2, drive the servo motor 1 to rotate through the servo motor controller 14. When the diagonal vertices of the square light openings of the two aperture baffles coincide, it is recorded as the position where the light-transmitting area is 0, and the rotation angle of the servo motor 1 relative to the zero position of movement is recorded; wherein, the adjustment steps for the position where the light-transmitting area is 0 are: place a flashlight on one side of the two aperture baffles, and observe on the other side. The position where the light just disappears is the position where the light-transmitting area is 0.
[0028] Step 3: Use the servo motor to drive the two aperture baffles to move to adjust and increase the size of the light-transmitting area, use a ruler to read the two side lengths of the light-transmitting area, calculate the area of the light-transmitting area, and record the corresponding rotation angle of the servo motor when the area of the light-transmitting area is different.
[0029] Step 4: Establish a corresponding relationship between the light-transmitting area and the rotation angle of the servo motor according to the recorded areas of the light-transmitting areas and the rotation angles of the corresponding servo motors.
[0030] Among them, the least square method is used to calculate the linear coefficient and constant term of the light-transmitting area and the square of the rotation angle of the servo motor; Obtaining a corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor based on the linear coefficient and the constant term; Among them, the relationship is:
[0031] In the formula, Indicates the area of the light-transmitting region; Indicates the rotation angle of the servo motor; represents the linear coefficient; Represents a constant term.
[0032] Step 5: Write the corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor into the control program of the servo motor controller.
[0033] Step 6: When performing infrared sensitivity testing, input the required light transmission area into the control program, and the control program automatically calculates the rotation angle.
[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. An automatic variable aperture mechanism for infrared sensitivity testing, characterized in that: include: Two aperture baffles, the two aperture baffles are arranged in parallel, and both are processed with light-through holes, and the overlapping parts of the two light-through holes constitute the light-through area; And a driving component, which is used for driving the two aperture baffles to move so as to adjust the size of the light-transmitting area.
2. The automatic variable aperture mechanism for infrared sensitivity testing according to claim 1, characterized in that: The drive components include: Servo motors and servo motor controllers; A screw rod is connected to the output end of the servo motor, and is provided with two threaded sections with opposite rotation directions; Two nut connection blocks, correspondingly threadedly connected to the threaded section of the screw rod, wherein each nut connection block is fixedly connected to the bottom of an aperture baffle through an adapter plate; And a guide component is used for guiding the nut connecting block along the axial direction of the screw rod.
3. The automatic variable aperture mechanism for infrared sensitivity testing according to claim 2, characterized in that: The screw rod is horizontally erected through two limit support blocks, and the screw rod is connected to the corresponding limit support block through a bearing.
4. The automatic variable aperture mechanism for infrared sensitivity testing according to claim 3, characterized in that: The guide assembly comprises: a guide rail plate, the guide rail plate is connected between the limit support blocks, and the guide rail plate is slidably connected to the corresponding side surfaces of the nut connection block.
5. The automatic variable aperture mechanism for infrared sensitivity testing according to claim 1, characterized in that: The light-through hole is a rectangular light-through hole, and the diagonals of the rectangular light-through holes of the two aperture baffles are parallel in the horizontal plane. A ruler is set on one edge of each rectangular light-through hole, and the rulers of the two rectangular light-through holes are set on two adjacent edges of the two rectangular light-through holes. The two rulers are used to calculate the area size of the light-through area.
6. The automatic variable aperture mechanism for infrared sensitivity testing according to claim 5, characterized in that: When the rectangular light-through hole is a square light-through hole, a scale is provided on one edge of a square light-through hole of the aperture baffle located on the outside.
7. A calibration and testing method for an automatic variable aperture mechanism for infrared sensitivity testing, characterized in that: include: The servo motor controller is used to drive the servo motor to rotate, so that the nut connecting block on the screw rod drives the corresponding two aperture baffles to move in the opposite direction to the corresponding limit support block, and this place is recorded as the movement zero position; Drive the servo motor to rotate. When the diagonal vertices of the square light openings of the two aperture baffles coincide, it is recorded as the position where the light passing area is 0, and the rotation angle of the servo motor relative to the zero position of movement is recorded; The two aperture baffles are driven to move by a servo motor to adjust and increase the size of the light-transmitting area, and the two side lengths of the light-transmitting area are read by a ruler, and the area of the light-transmitting area is calculated, and the corresponding rotation angle of the servo motor when the area of the light-transmitting area is different is recorded; According to the recorded areas of the plurality of light-transmitting regions and the rotation angles of the plurality of corresponding servo motors, a corresponding relationship between the areas of the light-transmitting regions and the rotation angles of the servo motors is established; The corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor is written into the control program of the servo motor controller; When conducting an infrared sensitivity test, the required light-transmitting area is input into the control program, which automatically calculates the rotation angle.
8. The automatic variable aperture mechanism and calibration test method for infrared sensitivity testing according to claim 1, characterized in that: The adjustment steps for the position where the light transmission area is 0 are as follows: place a flashlight on one side of the two aperture baffles and observe on the other side. The position where the light just disappears is the position where the light transmission area is 0.
9. The automatic variable aperture mechanism and calibration test method for infrared sensitivity testing according to claim 1, characterized in that: The corresponding relationship between the area of the light-transmitting area and the rotation angle of the servo motor is as follows: The least square method is used to calculate the linear coefficient and constant term of the light-transmitting area and the square of the rotation angle of the servo motor; Obtaining a corresponding relationship between the area of the light-transmitting region and the rotation angle of the servo motor based on the linear coefficient and the constant term; Among them, the relationship is: In the formula, Indicates the area of the light-transmitting region; Indicates the rotation angle of the servo motor; represents the linear coefficient; Represents a constant term.