Diaphragm device for simulating infrared target and control circuit thereof

Abstract

A diaphragm device for simulating an infrared target and a control circuit thereof relate to the technical field of infrared remote sensing external field radiometric calibration, and comprise a driving assembly, a base, a diaphragm disc, a vertical rod and photoelectric switches, a step-shaped cylinder is arranged at the center of the base, and a plurality of photoelectric switches are uniformly distributed along the circumferential direction of the edge of the base. A vertical rod is arranged between any two optoelectronic switches, the diaphragm disc is rotationally connected to the step face of the cylinder, a plurality of diaphragm pieces are arranged in the circumferential direction of the diaphragm disc, the diameters of diaphragm holes in the centers of the diaphragm pieces are different, a shielding rod is fixed to the position, between any two diaphragm pieces, of the diaphragm disc, and the shielding rod is fixed to the position, between any two diaphragm pieces, of the diaphragm disc. The lower part of the shielding rod penetrates through the diaphragm disc and is in contact with the vertical rod; the diaphragm disc is driven by the driving assembly to rotate, and elastic sheet assemblies are correspondingly arranged on the two sides of the upper face of the diaphragm disc. According to the invention, the automatic switching of different diaphragm apertures is realized, the precise control of the diaphragm aperture position is realized through the cooperative work of the driving circuit, the decoding precision is high, and the operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of infrared remote sensing field radiation calibration technology, and in particular to an aperture device for simulating infrared targets and its control circuit. Background Technology

[0002] An aperture device plays a role in regulating the energy of an infrared beam in an infrared target simulation system. However, most aperture devices currently in use have the following problems: First, the method of automatically adjusting the aperture size by moving the aperture plate with a motor is insufficient in terms of aperture precision, and cannot achieve the sudden appearance of a large aperture to simulate the sudden appearance of a large target. Second, the method of manually changing different aperture plates to adjust the aperture size has a low degree of automation and cannot meet the automation requirements. Therefore, proposing an aperture device for simulating infrared targets and its control circuit to achieve the switching of different aperture diameters and the sudden appearance of a large aperture has become a basic requirement for those skilled in the art. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an aperture device for simulating infrared targets and its control circuit.

[0004] The technical solution adopted in this invention is: An aperture device for simulating an infrared target includes a driving assembly, a base, an aperture disk, a support rod, and photoelectric switches. A stepped cylinder is located at the center of the base. Multiple photoelectric switches are evenly distributed along the circumference of the base edge. A support rod is positioned between any two photoelectric switches. The aperture disk is rotatably connected to the stepped surface of the cylinder. Multiple aperture plates are arranged along the circumference of the aperture disk, each with a different diameter aperture hole at its center. A blocking rod is fixed on the aperture disk between any two aperture plates, with its lower part passing through the aperture disk and contacting the support rod. The aperture disk is driven to rotate by the driving assembly, and spring-loaded assemblies are correspondingly located on both sides of the upper surface of the aperture disk. Each spring assembly includes a spring, a return spring, and two fixing screws. The spring is arc-shaped, with its outer end located outside the aperture plate and its inner end located above the aperture plate. One fixing screw passes through the central through hole of the spring and the central hole of the return spring in sequence and is connected to the aperture plate, with the spring located between the two aperture holes. The other fixing screw is fixed to the aperture plate, with its nut located on the inner end face of the spring. One end of the return spring is fixed to the spring with a hook, and the other end is set in a hole on the upper end face of the aperture plate.

[0005] The aperture device for simulating an infrared target has the same number of aperture holes on the aperture disk as the number of photoelectric switches, and they are arranged vertically in correspondence.

[0006] The aforementioned aperture device for simulating an infrared target includes a driving component comprising a stepper motor and a gear set. The stepper motor is fixed to one side of the base, and a gear disk is fixedly connected to the output shaft of the stepper motor. The gear set includes a gear seat A, a gear seat B, a large gear, and a small gear. Gear seats A and B are fixedly spaced on the base, and a gear shaft is fixed at the center of gear seats A and B. The large gear and the small gear are rotatably connected to the gear shaft of gear seat A at intervals. The large gear meshes with the teeth on the gear disk. A rotating gear disk is rotatably connected to the gear shaft of gear seat B, and the small gear meshes with the teeth on the rotating gear disk. The rotating gear disk meshes with the outer teeth on the outer circumference of the aperture disk.

[0007] A control circuit for an infrared target-simulating aperture device includes an aperture position decoding circuit, an indicator circuit, a photoelectric switch array circuit, and an aperture mechanism driving circuit. The aperture position decoding circuit includes multiplexer chips IC1 and IC2 and a logic gate NOT gate IC6B. The aperture position decoding circuit is used to decode the three-bit binary aperture selection code and output a drive start / stop control signal in combination with the feedback signal of the photoelectric switch array circuit. The indicator circuit includes a driver amplifier IC3C and an LED aperture position indicator. The LED aperture position indicator is connected to the output terminal of the driver amplifier IC3C and is used to indicate the current position of the aperture. The photoelectric switch array circuit includes multiple photoelectric switches 6 arranged along the circumference. When the selected aperture is in place, the photoelectric switch 6 corresponding to the aperture position is blocked by the blocking rod 1, and outputs a low-level signal to the aperture position decoding circuit. The aperture mechanism drive circuit includes an oscillator IC5, a three-phase six-beat motor drive pulse generation circuit IC9, optocouplers IC14, IC15, and IC16, as well as field-effect transistor power amplifiers Q1, Q2, and Q3. The output of the oscillator IC5 is connected to the input of the shaping circuit IC6A, the output of the shaping circuit IC6A is connected to the input of the three-phase six-beat motor drive pulse generation circuit IC9, and the output of the three-phase six-beat motor drive pulse generation circuit IC9 is connected to the input of the current amplifier circuit IC13. The input terminals are connected, and the output terminals of the current amplifier circuit IC13 are connected to the input terminals of optocouplers IC14, IC15, and IC16, respectively. The output terminals of optocouplers IC14, IC15, and IC16 are connected to the input terminals of MOSFET power amplifiers Q1, Q2, and Q3, respectively. The output terminals of MOSFET power amplifiers Q1, Q2, and Q3 are connected to the stepper motor to drive the stepper motor to rotate the aperture disk.

[0008] The control circuit of the aperture device for simulating an infrared target uses three binary aperture selection codes D0, D1, and D2 as selection control signals, which are respectively connected to the signal input terminals of multiplexer IC1 and multiplexer IC2. The signal output terminal of multiplexer IC2 is connected to the input terminal of logic gate IC6B. The output terminal of logic gate IC6B is connected to the input terminal of inverter IC6E. The output terminal of inverter IC6E is connected to the enable terminal of oscillator IC5. The high and low levels output by inverter IC6E control the start and stop of oscillation of oscillator IC5.

[0009] The control circuit of the simulated infrared target aperture device has a non-inverting input terminal of the driver amplifier IC3C grounded through a resistor, and the non-inverting input terminal connected to the output terminal of the multiplexer IC1. The output terminal of the driver amplifier IC3C is connected to the anode of the LED aperture position indicator, the cathode of the LED aperture position indicator is grounded, and the LED aperture position indicator corresponds one-to-one with the aperture position.

[0010] The control circuit of the aperture device for simulating infrared targets has a photoelectric switch whose power supply terminal is connected to a DC power supply, a ground terminal is grounded, and its output terminal is connected to the corresponding terminal of the multiplexer chip IC2.

[0011] The control circuit of the aperture device for simulating infrared targets includes an oscillator IC5 comprising NAND gate IC5A and NAND gate IC5B. The input terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B through resistors R11 and R12. The output terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B. The output terminal of NAND gate IC5B is connected to the input terminal of shaping circuit IC6A.

[0012] Due to the adoption of the technical solution described above, the present invention has the following advantages: The aperture device and its control circuit for simulating infrared targets described in this invention utilize a spring assembly on an optical cable reel. A stepper motor drives the aperture disk to rotate, and the spring rotates upon contact with the support rod, completely blocking the corresponding aperture hole. As the aperture disk continues to rotate, the spring leaves the support rod, at which point the photoelectric switch corresponding to the hole is blocked by the light-blocking rod, the aperture disk stops rotating, and the spring immediately rebounds under the action of a return spring, suddenly revealing a large-aperture aperture. This invention can achieve automatic switching between different aperture diameters, and through the coordinated work of the aperture hole position decoding circuit, indicator circuit, photoelectric switch array circuit, and aperture mechanism drive circuit, it achieves precise control of the aperture hole position, high decoding accuracy, and convenient operation. Attached Figure Description

[0013] Figure 1 This is an overall schematic diagram of the aperture device of the present invention.

[0014] Figure 2This is a schematic diagram of the installation structure of the photoelectric switch of the present invention.

[0015] Figure 3 This is a schematic diagram of the structure of the present invention, which involves installing a spring assembly and a blocking rod on the aperture plate.

[0016] Figure 4 This is a control circuit diagram of the aperture device of the present invention.

[0017] In the diagram: 1. Blocking rod; 2. Upright pole; 3. Rebound spring; 4. Spring piece; 5. Fixing screw; 6. Photoelectric switch; 7. Aperture plate; 8. Aperture disk; 9. Stepper motor; 10. Gear set; 11. Base; 12. Large gear; 13. Gear seat A; 14. Gear seat B; 15. Gear disc; 16. Small gear. Detailed Implementation

[0018] The present invention will be further explained and described below with reference to the accompanying drawings and embodiments. However, this should not be construed as limiting the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0019] Combined with appendix Figure 1-3 An aperture device for simulating an infrared target includes a drive assembly, a base 11, an aperture disk 8, a support rod 2, and photoelectric switches 6. A stepped cylinder is provided at the center of the base 11, and multiple photoelectric switches 6 are evenly distributed along the circumference of the edge of the base 11. A support rod 2 is provided between any two photoelectric switches 6. The aperture disk 8 is rotatably connected to the stepped surface of the cylinder. Multiple aperture plates 7 are provided along the circumference of the aperture disk 8, and the diameter of the aperture hole at the center of each aperture plate 7 is different. A blocking rod 1 is fixed on the aperture disk 8 between any two aperture plates 7, and the lower part of the blocking rod 1 passes through the aperture disk 8 and contacts the support rod 2. The aperture disk 8 is driven to rotate by the drive assembly, and spring assemblies are provided on both sides of the upper part of the aperture disk 8. Each spring assembly includes a spring 4, a return spring 3, and two fixing screws 5. The spring 4 is arc-shaped, with its outer end located outside the aperture plate 8 and its inner end located above the aperture plate 8. One fixing screw 5 passes through the central through hole of the spring 4 and the central hole of the return spring 3 and is connected to the aperture plate 8. The other fixing screw 5 is fixed to the aperture plate 8, with its nut located on the inner end face of the spring 4. One end of the return spring 3 is fixed to the spring 4, and the other end is set in the hole on the upper end face of the aperture plate 8.

[0020] Specifically, the drive assembly includes a stepper motor 9 and a gear set 10. The stepper motor 9 is fixed to one side of the base 11, and a gear disk is fixedly connected to the output shaft of the stepper motor 9. The gear set 10 includes a gear seat A13, a gear seat B14, a large gear 12, and a small gear 16. The gear seats A13 and B14 are fixed to the base 11 at intervals. A gear shaft is fixed at the center of the gear seats A13 and B14. The large gear 12 and the small gear 16 are rotatably connected to the gear shaft of the gear seat A13 at intervals. The large gear 12 meshes with the teeth on the gear disk. A rotating gear disk 15 is rotatably connected to the gear shaft of the gear seat B14. The small gear 16 meshes with the teeth on the rotating gear disk 15. The rotating gear disk 15 is meshed with the external teeth on the outer circumference of the aperture disk 8.

[0021] When simulating an infrared target, the diameter of the aperture at the rear of the spring 4 is larger than the diameter of the aperture at the front of the spring 4. The stepper motor 9 of the aperture device drives the large gear 12 of the gear set 10 to rotate. The small gear 16 at the lower part of the large gear 12 meshes with the rotating gear disk 15 and rotates, thereby driving the aperture disk 8 to rotate. When the aperture disk 8 rotates, the blocking rod 1 rotates with the aperture disk 8. When the outer end of the spring 4 touches the column 2, the spring 4 rotates towards the aperture at the rear, thereby blocking the aperture. The aperture disk 8 continues to rotate, the column 2 disengages from the spring 4, and the spring 4 rebounds to its original position under the force of the spring spring 3. The sudden rebound realizes the sudden appearance of the large aperture. At this time, the aperture coincides with the center of the blackbody radiation aperture, and the photoelectric switch corresponding to the position of the blocking rod 1 is blocked.

[0022] A control circuit for an aperture device simulating an infrared target, as shown in the attached diagram. Figure 1-4 As shown in the attached document Figure 1-4 As shown, it includes an aperture position decoding circuit, an indicator circuit, a photoelectric switch array circuit, and an aperture mechanism driving circuit. The aperture position decoding circuit includes multiplexer chips IC1 and IC2 and a logic gate NOT gate IC6B. The aperture position decoding circuit is used to decode the binary aperture selection code and output a drive start / stop control signal in combination with the feedback signal from the photoelectric switch array circuit. The multiplexer chips IC1 and IC2 are of model CD4051. The indicator circuit includes a driver amplifier IC3C and an LED aperture position indicator. The LED aperture position indicator is connected to the output terminal of the driver amplifier IC3C and is used to indicate the current position of the aperture. The photoelectric switch array circuit includes multiple photoelectric switches 6 arranged along the circumference. When the selected aperture is in place, the photoelectric switch 6 corresponding to the aperture position is blocked by the blocking rod 1, and outputs a low-level signal to the aperture position decoding circuit. The aperture mechanism drive circuit includes an oscillator IC5, a three-phase six-beat motor drive pulse generation circuit IC9, optocouplers IC14, IC15, and IC16, and field-effect transistor power amplifiers Q1, Q2, and Q3. The output of oscillator IC5 is connected to the input of shaping circuit IC6A. The output of shaping circuit IC6A is connected to the input of three-phase six-beat motor drive pulse generation circuit IC9. The output of three-phase six-beat motor drive pulse generation circuit IC9 is connected to the input of current amplifier circuit IC13. The output of current amplifier circuit IC13 is connected to optocouplers IC14 and IC15, and the output of current amplifier circuit IC13 is connected to optocouplers IC14 and IC16, respectively. The input terminals of IC15 and optocoupler IC16 are connected. The power supply terminals of optocouplers IC14, IC15, and IC16 are connected to the power supply voltage, and the ground terminal is grounded. The output terminals of optocouplers IC14, IC15, and IC16 are connected to the input terminals of MOSFET power amplifiers Q1, Q2, and Q3, respectively. The output terminals of MOSFET power amplifiers Q1, Q2, and Q3 are connected to the stepper motor to drive the stepper motor to rotate the aperture disk. The chip model of IC9, which is used to generate the three-phase six-step motor drive pulse, is LCB 052B.

[0023] The control circuit of the aperture device for simulating an infrared target includes a current amplifier circuit IC13 composed of IC13A, IC13B, and IC13C. The output of IC13A is connected to the input of optocoupler IC14 through resistor R25. The output of IC13B is connected to the input of optocoupler IC14 through resistor R30. The output of IC13C is connected to the input of optocoupler IC14 through resistor R33. The non-inverting inputs of IC13A, IC13C, and IC13B are connected to the output pins IC9 / 14, IC9 / 12, and IC9 / 10 of the three-phase six-beat motor drive pulse generation circuit IC9, respectively.

[0024] The control circuit of the aperture device for simulating infrared targets has the output terminals of MOSFET power amplifiers Q1, Q2, and Q3 connected to phase C, phase B, and phase A of the stepper motor, respectively.

[0025] The control circuit of the aperture device for simulating an infrared target uses three binary aperture selection codes D0, D1, and D2 as selection control signals, which are respectively connected to the signal input terminals of multiplexer IC1 and multiplexer IC2. The signal output terminal of multiplexer IC2 is connected to the input terminal of logic gate IC6B. The output terminal of NOT gate IC6B is connected to the input terminal of inverter IC6E. The output terminal of inverter IC6E is connected to the enable terminal of oscillator IC5. The high and low levels output by inverter IC6E control the start and stop of oscillation of oscillator IC5.

[0026] The control circuit of the aperture device for simulating infrared targets has a non-inverting input terminal of the driver amplifier IC3C grounded through resistor R2. The non-inverting input terminal is connected to the output terminal of the multiplexer IC1. The output terminal of the driver amplifier IC3C is connected to the anode of the LED aperture position indicator. The cathode of the LED aperture position indicator is grounded, and the LED aperture position indicator corresponds one-to-one with the aperture position.

[0027] The control circuit of the aperture device for simulating an infrared target has a power supply terminal of photoelectric switch N1 connected to a DC power supply, a ground terminal grounded, and an output terminal connected to the corresponding terminal of multiplexer chip IC2.

[0028] The control circuit of the aperture device for simulating infrared targets includes an oscillator IC5 comprising NAND gate IC5A and NAND gate IC5B. The input terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B through resistors R11 and R12. The output terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B. The output terminal of NAND gate IC5B is connected to the input terminal of shaping circuit IC6A. Example

[0029] The three-bit binary code corresponding to the target aperture is output by an external binary encoding module or key switch. The output three-bit binary code is 001. Pin 14 (IC2 / 14) and pin 3 (IC2 / 3) of IC2 and pin 14 (IC1 / 14) and pin 3 (IC1 / 3) of IC1 are encoding selection terminals. At this time, photoelectric switch N1 is not blocked and outputs a high level. This high-level signal is transmitted to pin 14 of IC2 (IC2 / 14), causing IC2 / 14 to output a high level synchronously. IC6B / 4, IC1 / 3, and IC1 / 14 output low levels, and the indicator light for the target aperture position does not light up, indicating that the target aperture is not in position. The low-level signal of IC6B / 4 is transmitted to inverter IC6E for inversion, causing pin 10 of IC6E / 10 to become high. This high-level signal triggers the oscillator composed of IC5A and IC5B to start oscillating, generating a continuous oscillation signal. The signal is shaped by the shaping circuit IC6A, frequency divided by the three-phase six-step motor drive pulse generation circuit IC9, amplified by the current amplifier circuit IC13, and isolated by the optocouplers IC14, IC15, and IC16. The processed drive signal is then transmitted to the MOSFET power amplifiers Q1, Q2, and Q3, driving the stepper motor 9 to rotate the gear set 10. The gear set 10 meshes with the aperture plate 8, causing the aperture plate 8 to rotate. When the spring 4 contacts the upright 2, it rotates, and the spring 4 will completely block the rotation. When the target aperture is positioned, as the aperture plate continues to rotate, the spring 4 leaves the support rod 2. At this time, the photoelectric switch N1 is blocked by the light-shielding rod 1, IC2 / 14 and IC2 / 3 go low, IC6B / 4 goes high, and IC6E / 10 goes low. The oscillator stops oscillating, the stepper motor 9 stops rotating, and the aperture plate 8 stops at the target aperture position. Simultaneously, the high level output of IC1 / 14, driven by the IC3C driver amplifier, illuminates LED1, indicating that the target aperture is in position. The spring 4 then springs back to its original position under the force of the return spring 3. This sudden rebound achieves the large aperture position. The sudden appearance of the aperture; wherein, the output terminal of the shaping circuit IC6A is connected to pin IC11 / 12 of the monostable multivibrator IC11, and pin IC11 / 9 is connected to pin IC9 / 5 of the input terminal of the three-phase six-step motor drive pulse generation circuit IC9. When the oscillator IC5 stops oscillating, pin IC11 / 9 of the monostable multivibrator IC11 is delayed to a high level, and the stepper motor is de-energized through pin IC9 / 5 to avoid overheating of the motor. The monostable multivibrator IC11, together with capacitors C10 and C12, resistors R14 and R36, constitutes a stepper motor protection delay circuit.

[0030] The parts of this invention not described in detail are prior art.

[0031] The embodiments selected herein for the purpose of disclosing the inventive objectives are currently considered suitable; however, it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of this concept and invention.

Claims

1. A light-aperture device for simulating an infrared target, comprising a driving assembly, a base, a light-aperture disk, a support pole, and a photoelectric switch; characterized in that: A stepped cylinder is located at the center of the base. Multiple photoelectric switches are evenly distributed along the circumference of the base edge. A support rod is located between any two photoelectric switches. An aperture disk is rotatably connected to the stepped surface of the cylinder. Multiple aperture plates are located along the circumference of the aperture disk. The diameter of the aperture hole at the center of each aperture plate is different. A blocking rod is fixed on the aperture disk between any two aperture plates. The lower part of the blocking rod passes through the aperture disk and contacts the support rod. The aperture disk is driven to rotate by a drive assembly. Spring sheet assemblies are correspondingly located on both sides of the upper part of the aperture disk. Each spring assembly includes a spring, a return spring, and two fixing screws. The spring is arc-shaped, with its outer end located outside the aperture plate and its inner end located above the aperture plate. One fixing screw passes through the central through hole of the spring and the central hole of the return spring in sequence and is connected to the aperture plate, with the spring located between the two aperture holes. The other fixing screw is fixed to the aperture plate, with its nut located on the inner end face of the spring. One end of the return spring is fixed to the spring with a hook, and the other end is set in a hole on the upper end face of the aperture plate.

2. The aperture device for simulating an infrared target according to claim 1, characterized in that: The number of aperture holes on the aperture plate is the same as the number of photoelectric switches, and they are set vertically in correspondence.

3. The aperture device for simulating an infrared target according to claim 1, characterized in that: The drive assembly includes a stepper motor and a gear set. The stepper motor is fixed to one side of the base, and a gear disk is fixedly connected to the output shaft of the stepper motor. The gear set includes gear seat A, gear seat B, a large gear, and a small gear. Gear seat A and gear seat B are fixed to the base at intervals. A gear shaft is fixed at the center of gear seat A and gear seat B. The large gear and small gear are rotatably connected to the gear shaft of gear seat A at intervals. The large gear meshes with the teeth on the gear disk. A rotating gear disk is rotatably connected to the gear shaft of gear seat B. The small gear meshes with the teeth on the rotating gear disk. The rotating gear disk meshes with the external teeth on the outer circumference of the aperture disk.

4. A control circuit for an infrared target simulating aperture device, employing the infrared target simulating aperture device as described in any one of claims 1-3, characterized in that: It includes an aperture position decoding circuit, an indicator circuit, a photoelectric switch array circuit, and an aperture mechanism driving circuit. The aperture position decoding circuit includes multiplexer chips IC1 and IC2 and a logic gate NOT gate IC6B. The aperture position decoding circuit is used to decode the three-bit binary aperture selection code and output a drive start / stop control signal in combination with the feedback signal of the photoelectric switch array circuit. The indicator circuit includes a driver amplifier IC3C and an LED aperture position indicator. The LED aperture position indicator is connected to the output terminal of the driver amplifier IC3C and is used to indicate the current position of the aperture. The photoelectric switch array circuit includes multiple photoelectric switches 6 arranged along the circumference. When the selected aperture is in place, the photoelectric switch 6 corresponding to the aperture position is blocked by the blocking rod 1, and outputs a low-level signal to the aperture position decoding circuit. The aperture mechanism drive circuit includes an oscillator IC5, a three-phase six-beat motor drive pulse generation circuit IC9, optocouplers IC14, IC15, and IC16, as well as field-effect transistor power amplifiers Q1, Q2, and Q3. The output of the oscillator IC5 is connected to the input of the shaping circuit IC6A, the output of the shaping circuit IC6A is connected to the input of the three-phase six-beat motor drive pulse generation circuit IC9, and the output of the three-phase six-beat motor drive pulse generation circuit IC9 is connected to the input of the current amplifier circuit IC13. The input terminals are connected, and the output terminals of the current amplifier circuit IC13 are connected to the input terminals of optocouplers IC14, IC15, and IC16, respectively. The output terminals of optocouplers IC14, IC15, and IC16 are connected to the input terminals of MOSFET power amplifiers Q1, Q2, and Q3, respectively. The output terminals of MOSFET power amplifiers Q1, Q2, and Q3 are connected to the stepper motor to drive the stepper motor to rotate the aperture disk.

5. The control circuit of the aperture device for simulating an infrared target according to claim 4, characterized in that: The three binary aperture selection codes D0, D1, and D2 are used as selection control signals and are respectively connected to the signal input terminals of multiplexer IC1 and multiplexer IC2. The signal output terminal of multiplexer IC2 is connected to the input terminal of logic gate IC6B. The output of logic gate IC6B is connected to the input of inverter IC6E, and the output of inverter IC6E is connected to the enable terminal of oscillator IC5. The high and low levels output by inverter IC6E control the start and stop of oscillation of oscillator IC5.

6. The control circuit of the aperture device for simulating an infrared target according to claim 4, characterized in that: The non-inverting input of the driver amplifier IC3C is grounded through a resistor, and the non-inverting input is connected to the output of the multiplexer IC1. The output of the driver amplifier IC3C is connected to the anode of the LED aperture position indicator, the cathode of the LED aperture position indicator is grounded, and the LED aperture position indicator corresponds one-to-one with the aperture position.

7. The control circuit of the aperture device for simulating an infrared target according to claim 4, characterized in that: The power supply terminal of the photoelectric switch is connected to a DC power supply, the ground terminal is grounded, and the output terminals are connected to the corresponding terminals of the multiplexer chip IC2.

8. The control circuit of the aperture device for simulating an infrared target according to claim 4, characterized in that: The oscillator IC5 includes NAND gate IC5A and NAND gate IC5B. The input terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B through resistors R11 and R12. The output terminal of NAND gate IC5A is connected to the input terminal of NAND gate IC5B. The output terminal of NAND gate IC5B is connected to the input terminal of shaping circuit IC6A.

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