Simulation calibration device of laser ranging mainboard

Abstract

The utility model belongs to the technical field of laser ranging, and particularly relates to a simulation calibration device of a laser ranging mainboard, which comprises a simulation laser flight module, a high-precision timing module and a single chip microcomputer control module. The simulation laser flight module is electrically connected with the high-precision timing module, the single-chip microcomputer control module is electrically connected with the high-precision timing module, and the simulation laser flight module is electrically connected with the single-chip microcomputer control module. Mainboard calibration of a laser ranging product can be completed indoors, outdoor actual measurement is not needed, errors caused by outdoor weather changes are avoided, manpower and material resources are saved, and production efficiency is greatly improved; expensive optical fibers are not needed, the measuring distance is very easy to change, and the calibration precision is higher than that of the optical fibers.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser ranging, and in particular relates to a simulation calibration device for a laser ranging mainboard. Background Art

[0002] At present, there are two common methods for calibrating the distance accuracy of laser rangefinder products before they leave the factory: (1) Direct test calibration with actual targets, which is to emit a laser beam to the target with a pre-measured distance and wait for the laser to return before displaying the measured distance. The measurement accuracy of the laser rangefinder is calibrated by checking the measurement error. This method requires outdoor measurement. During the measurement process, the measurement accuracy will be affected by factors such as weather, sunlight, air dust, and water mist. These factors will affect the measurement accuracy, especially the measurement calibration of different batches of products under different weather conditions. (2) Another method is to use a fiber bundle of predetermined length for indoor calibration. This method has high calibration accuracy and is not affected by the environment. However, different lengths of fiber are required to calibrate different ranges during the measurement process. If the range reaches more than 10 km, the length of the fiber must reach 10 km. In this way, due to the long length of the fiber, the volume of the fiber will be very large when it is rolled up. In addition, since it is rolled up, the propagation of the laser in the fiber will be affected, the laser attenuation will be relatively large or even no echo will be emitted, and it is extremely inflexible to use. Utility Model Content

[0003] Generally, laser ranging products are composed of three parts: laser ranging main board, transmitter board and receiver board. Figure 1 As shown, when distance measurement is required, the laser ranging mainboard generates a trigger signal to the transmitting board, and the transmitting board emits the laser. When the flying laser encounters the target and is reflected back, the receiving device of the receiving board converts the weak laser reflected back by the target into an electrical pulse signal and transmits this signal to the laser ranging mainboard. The laser ranging mainboard calculates the time from laser emission to reception, and then uses the formula:

[0004] L=CT / 2

[0005] in:

[0006] L: The distance from the laser emission to the object being measured

[0007] C: Speed ​​of light

[0008] T: is the laser flight time

[0009] The distance can be calculated using the above formula.

[0010] from Figure 1As can be seen from the above principles, the composition function of the entire laser ranging product is relatively complex, and the calibration of measurement accuracy is also relatively complex and difficult, as follows:

[0011] 1) The discreteness of electronic components and optical parts will affect the ranging accuracy;

[0012] 2) The optical reflectivity of the target will affect the ranging accuracy;

[0013] 3) Haze, clouds, water mist and various dust in the sky will affect the ranging accuracy and range.

[0014] The key component that determines the accuracy of a laser ranging product is the laser ranging motherboard. The transmitter and receiver boards are simply the components for laser emission and reception. Although they have a certain degree of discreteness, this effect can be effectively reduced through PCB design. If the accuracy of the laser ranging motherboard is clearly calibrated, the accuracy of the entire ranging product is also calibrated.

[0015] The technical problem to be solved by the utility model is to provide a simulation calibration device for a laser ranging mainboard, so as to facilitate the calibration of the laser ranging mainboard and improve the calibration accuracy and production efficiency.

[0016] In order to solve the above technical problems, the technical solution of the utility model is:

[0017] A simulation calibration device for a laser ranging mainboard includes a simulated laser flight module, a high-precision timing module, and a single-chip microcomputer control module; the simulated laser flight module is electrically connected to the high-precision timing module, the single-chip microcomputer control module is electrically connected to the high-precision timing module, and the simulated laser flight module is electrically connected to the single-chip microcomputer control module.

[0018] In the simulation calibration device of the laser ranging mainboard provided by the present invention, preferably, the simulated laser flight module includes a first integrated block U1 and a second integrated block U2;

[0019] Pin 1, pin 4, pin 8 and pin 11 of the first integrated block U1 are respectively electrically connected to the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 and constitute a time control circuit;

[0020] Pins 3, 6, 7, 10, 11 and 16 of the second integrated block U2, the fifth resistor R5 and the third capacitor C3 form a short pulse single-problem circuit.

[0021] In the simulation calibration device of the laser ranging mainboard provided by the present invention, preferably, the high-precision timing module includes a pulse width measurement device U14 and a sixth resistor R6, and the pin 19 of the pulse width measurement device U14 is electrically connected to the eighth resistor R59 and the pin 2 of the second integrated block U2;

[0022] One end of the sixth resistor R6 is electrically connected to pins 16 and 17 of the pulse width measurement device U14 , and the other end is electrically connected to pin 12 of the second integrated block U2 .

[0023] In the simulation calibration device of the laser ranging mainboard provided by the present invention, more preferably, the single chip control module includes a main control single chip U7, a first button SW1, a second button SW2, a third button SW3 and a fourth button SW4;

[0024] Pins 20, 21, 22, and 23 of the master microcontroller U7 are electrically connected to the first button SW1, the second button SW2, the third button SW3, and the fourth button SW4, respectively;

[0025] Pins 8, 9, 10, and 11 of the main control microcontroller U7 are electrically connected to pins 5, 6, 12, and 13 of the first integrated block U1, respectively;

[0026] Pins 13, 14, 15, 16, and 17 of the master microcontroller U7 are electrically connected to pins 6, 7, 8, 9, and 10 of the pulse width measurement device U14, respectively.

[0027] Pins 33 and 34 of the main control microcontroller U7 are electrically connected to the display screen OLED1.

[0028] In the simulation calibration device of the laser ranging mainboard provided by the present invention, it is further preferred that the other end of the eighth resistor R59 is electrically connected to the first flexible circuit board FPC3.

[0029] In the simulation calibration device of the laser ranging mainboard provided by the present invention, it is further preferred that the fifth pin 5 of the second integrated block U2 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the second flexible circuit board FPC4.

[0030] The utility model solves the mainboard calibration problem of laser ranging products by using an electronic circuit to simulate laser flight. It uses a simulated laser flight module, a high-precision timing module and a single-chip microcomputer control module as calibration components, so that the mainboard calibration of the laser ranging product can be completed indoors without the need for outdoor actual measurement, thus avoiding errors caused by outdoor weather changes, saving manpower and material resources, and greatly improving production efficiency. It also does not require expensive optical fibers, making it very easy to change the measuring range, and the calibration accuracy is higher than that of optical fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the principle diagram of laser ranging;

[0032] Figure 2 This is the simulation calibration principle diagram of the laser ranging mainboard of the utility model;

[0033] Figure 3 A circuit diagram of a first integrated block and a second integrated block for simulating a laser flight module;

[0034] Figure 4 This is a circuit diagram of a pulse width measurement device;

[0035] Figure 5 This is the circuit diagram of the main control microcontroller. DETAILED DESCRIPTION

[0036] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0037] This embodiment provides a simulation calibration device for a laser ranging motherboard, such as Figure 2 As shown, it includes a laser flight simulation module G, a high-precision timing module E, and a single-chip control module F; the laser flight simulation module G is electrically connected to the high-precision timing module E, the single-chip control module F is electrically connected to the high-precision timing module E, and the laser flight simulation module D is electrically connected to the single-chip control module F. Its working process principle is as follows:

[0038] The laser ranging mainboard A controls the laser emission B and sends a trigger signal to the simulated laser flight module G of the simulation device D;

[0039] After receiving the trigger signal, the simulated laser flight module G delays the simulated laser flight time. When the set flight time is reached, a simulated laser reflection echo is generated and sent back to the receiving end laser receiver C of the laser ranging mainboard A, thus completing the laser flight simulation process.

[0040] When the laser ranging motherboard A completes the process from emitting laser to receiving laser echo, its motherboard CPU will calculate a distance value based on the time;

[0041] In the same time period, the single-chip microcomputer control module F of the simulation calibration device D will also complete the process from receiving the trigger signal of the laser emission B to the end of the simulated laser flight delay. Its high-precision timing module E will measure an accurate simulated laser flight time, and the single-chip microcomputer control module F will calculate the laser flight distance, thereby generating an accurate calibration distance value.

[0042] The laser ranging display value of the laser ranging mainboard A is calibrated according to the accurate value of the simulation calibration device D, thereby completing the calibration of the mainboard;

[0043] The laser flight time of the simulation calibration device D can be set by the single chip control module F, and there are 4 measurement ranges that can be set.

[0044] The simulated laser flight module includes a first integrated block U1 and a second integrated block U2; Figure 3 As shown, pin 1, pin 4, pin 8 and pin 11 of the first integrated block U1 are respectively electrically connected to the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 and constitute a time control circuit;

[0045] Pins 3, 6, 7, 10, 11, and 16 of the second integrated circuit U2, along with the fifth resistor R5 and the third capacitor C3, form a short-pulse single-issue circuit. The fifth pin 5 of the second integrated circuit U2 is electrically connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected to the second flexible circuit board FPC4.

[0046] When the monostable pulse cycle ends, the short pulse single-shot circuit composed of the fifth resistor R5 and the second capacitor C2 of the triggering second integrated block U2 is started, thereby generating a simulated laser emission echo that is transmitted back through the seventh resistor R7 and the second flexible circuit board FPC4 to the receiving end laser receiver C of the laser ranging mainboard A.

[0047] like Figure 4 As shown, the high-precision timing module includes a pulse width measurement device U14 and a sixth resistor R6. Pin 19 of the pulse width measurement device U14 is electrically connected to the eighth resistor R59 and pin 2 of the second integrated block U2; the other end of the eighth resistor R59 is electrically connected to the first flexible circuit board FPC3.

[0048] One end of the sixth resistor R6 is electrically connected to the pins 16 and 17 of the pulse width measurement device U14 , and the other end is electrically connected to the pin 12 of the second integrated block U2 .

[0049] like Figure 5 As shown, the single-chip microcomputer control module includes a main control single-chip microcomputer U7, a first button SW1, a second button SW2, a third button SW3 and a fourth button SW4;

[0050] Pins 20, 21, 22, and 23 of the main control microcontroller U7 are electrically connected to the first button SW1, the second button SW2, the third button SW3, and the fourth button SW4, respectively;

[0051] Pins 8, 9, 10, and 11 of the main control microcontroller U7 are electrically connected to pins 5, 6, 12, and 13 of the first integrated block U1, respectively;

[0052] Pins 13, 14, 15, 16, and 17 of the main control microcontroller U7 are electrically connected to pins 6, 7, 8, 9, and 10 of the pulse width measurement device U14, respectively.

[0053] Pins 33 and 34 of the main control microcontroller U7 are electrically connected to the display screen OLED1.

[0054] The first, second, third, and fourth buttons SW1, SW2, SW3, and SW4 operate various functions and parameter settings. They are primarily used to set test conditions. Examples include setting the simulated range, measurement accuracy, transmit and receive voltages, and the power supply voltage for the analog main control board. OLED1 displays various parameters and the laser range. A program is written to control the pulse delay resistor of the first integrated circuit U1 using pins 8, 9, 10, and 11 of the main control microcontroller U7. Pins 13, 14, 15, 16, and 17 of the main control microcontroller U7 are connected to pins 6, 7, 8, 9, and 10 of the pulse width measurement device U14, respectively, to initialize the device and read out pulse delay data. Pins 33 and 34 of the main control microcontroller U7 control the display to display the measured data.

[0055] When the laser emission pulse sent by the laser emission B of the laser ranging mainboard A passes through FPC3 and R59 and reaches pin 2 of the second integrated block U2, it triggers the start of the monostable pulse circuit of the second integrated block U2. The width of this monostable pulse is formed by the time control circuit composed of the first integrated block U1 and the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 to form different delay times. When the monostable pulse cycle ends, the short pulse single-shot circuit composed of the fifth resistor R5 and the second capacitor C2 of the second integrated block U2 is triggered to start, thereby generating a simulated laser emission echo, which is transmitted back to the laser receiver C of the laser ranging mainboard A through the seventh resistor R7 and the second flexible circuit board FPC4.

[0056] Pins 5, 6, 12, and 13 of the first integrated circuit U1 are connected to pins 1, 9, 10, and 11 of the main control microcontroller U7, respectively. Programming allows for gating control of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4. Because the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are different, different delayed pulses can be generated, thereby simulating different laser flight times.

[0057] Because the pulse width generated by the pulse delay circuit of the simulated laser flight module G varies with weather temperature and circuit factors, it cannot produce a stable delayed pulse time. If used to calibrate the laser ranging accuracy, it will not meet the required accuracy. Therefore, we need a precise pulse delay measurement device U14. The pulse delay measurement device U14 is a device that precisely measures pulse width. Its time resolution can reach 23ps, which can be converted to a distance accuracy of 0.007m for laser ranging, which shows that the accuracy meets the required requirements. The pulse delay measurement device U14 is a device controlled by the main control microcontroller U7. The initialization settings are performed through the pulse delay measurement device U14's pins 6, 7, 8, 9, and 10. Pin 19 is connected to the eighth resistor R59 and pin 2 of the second integrated circuit U2. When the trigger pulse from the laser ranging motherboard A arrives, it is triggered simultaneously. The pulse delay measuring device U14 starts high-speed timing. When the laser flight delay ends, a short pulse is generated by pin 12 of the second integrated block U2 and output to pins 16 and 17 of the pulse delay measuring device U14. The pulse delay measuring device U14 stops timing, and then outputs the timing time to the main control microcontroller U7 through pins 8 and 9 of the pulse delay measuring device U14. The main control microcontroller U7 reads the timing and converts it into a laser ranging distance and outputs it to the display screen. The laser ranging mainboard A can use this accurate data to calibrate the distance value.

[0058] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A simulation calibration device for a laser ranging motherboard, characterized in that: It includes a simulated laser flight module G, a high-precision timing module E and a single-chip control module F; the simulated laser flight module G is electrically connected to the high-precision timing module E, the single-chip control module F is electrically connected to the high-precision timing module E, and the simulated laser flight module G is electrically connected to the single-chip control module F.

2. The simulation calibration device of the laser ranging motherboard according to claim 1, characterized in that: The simulated laser flight module G includes a first integrated block U1 and a second integrated block U2; Pin 1, pin 4, pin 8 and pin 11 of the first integrated block U1 are respectively electrically connected to the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 and constitute a time control circuit; Pins 3, 6, 7, 10, 11 and 16 of the second integrated block U2, the fifth resistor R5 and the third capacitor C3 form a short pulse single-problem circuit.

3. The simulation calibration device of the laser ranging motherboard according to claim 2, characterized in that: The high-precision timing module E includes a pulse width measurement device U14 and a sixth resistor R6, wherein the pin 19 of the pulse width measurement device U14 is electrically connected to the eighth resistor R59 and the pin 2 of the second integrated block U2; One end of the sixth resistor R6 is electrically connected to pins 16 and 17 of the pulse width measurement device U14 , and the other end is electrically connected to pin 12 of the second integrated block U2 .

4. The simulation calibration device for the laser ranging motherboard according to claim 3, characterized in that: The single chip control module F includes a main control single chip U7, a first button SW1, a second button SW2, a third button SW3 and a fourth button SW4; Pins 20, 21, 22, and 23 of the master microcontroller U7 are electrically connected to the first button SW1, the second button SW2, the third button SW3, and the fourth button SW4, respectively; Pins 8, 9, 10, and 11 of the master microcontroller U7 are electrically connected to pins 5, 6, 12, and 13 of U1, respectively; Pins 8, 9, 10, and 11 of the main control microcontroller U7 are electrically connected to pins 5, 6, 12, and 13 of the first integrated block U1, respectively; Pins 13, 14, 15, 16, and 17 of the master microcontroller U7 are electrically connected to pins 6, 7, 8, 9, and 10 of the pulse width measurement device U14, respectively; Pins 33 and 34 of the main control microcontroller U7 are electrically connected to the display screen OLED1.

5. The simulation calibration device for the laser ranging motherboard according to claim 4, characterized in that: The other end of the eighth resistor R59 is electrically connected to the first flexible circuit board FPC3.

6. The simulation calibration device for the laser ranging motherboard according to claim 5, characterized in that: The fifth pin 5 of the second integrated block U2 is electrically connected to one end of a seventh resistor R7 , and the other end of the seventh resistor R7 is electrically connected to the second flexible circuit board FPC4 .

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