A detonator on-off target time difference testing device

Abstract

The application discloses a detonator on-off target time difference testing device, belongs to the field of electronic measurement technology, and solves the problems of poor multi-target synchronism, low measurement precision and incomplete functions of the existing device. The device is used in cooperation with a computer and an oscilloscope, and comprises a built-in battery, a voltage reduction module, an electric quantity display, a function switch, a voltage division resistor, a double-channel high-speed data acquisition, a signal transmission port and a detection indicator lamp and the like. Common mode interference is eliminated by adopting differential signal transmission, built-in FPGA realizes multi-channel parallel processing, a high-precision clock oscillator is carried, and loop charging functions such as integrated circuit self-checking, electric quantity display and loop charging are integrated. The application can realize double-channel synchronous acquisition of detonation signals and target line signals, is simple to operate, has low false triggering rate, high measurement precision, high reliability and high practicability, is suitable for detonator time difference testing and high-speed on-off signal analysis fields, and meets the requirement of target field high-precision testing.

Description

Technical Field

[0001] This invention belongs to the field of electronic measurement technology, specifically relating to a time difference testing device for the on / off target of pyrotechnics. It is particularly suitable for high-precision measurement of the time difference between the pyrotechnic detonation signal and the on / off signal of the target line, and can be extended to the fields of high-speed on / off signal time difference analysis, multi-channel high-speed signal acquisition and detonation ignition control. Background Technology

[0002] Pyrotechnics are widely used in weaponry, civilian blasting, and other fields. The time difference between the detonation signal and the target line signal during the detonation process is a key indicator for evaluating the performance of pyrotechnics and dynamic target parameters. Currently, range testing primarily uses time difference testing devices based on single-channel triggering and ordinary crystal oscillators. This technology uses a single-channel photoelectric sensor and an ordinary temperature-compensated crystal oscillator (TCXO) to achieve time difference measurement: the sensor module outputs a pulse signal through a single photodiode, which is amplified by an operational amplifier and transmitted to a comparator; the signal processing module triggers a timer based on the threshold judgment logic of an MCU to record a timestamp; and the clock module relies on the TCXO to provide a time reference. This device has the following shortcomings: First, the single-channel architecture cannot achieve simultaneous measurement of multiple targets, signal transmission is susceptible to common-mode interference, resulting in a high false trigger rate and poor data reliability; second, the ordinary crystal oscillator clock has poor stability, leading to large cumulative errors over long-term measurements and failing to meet high-precision requirements; third, it lacks functional completeness, lacking functions such as loop self-checking and real-time power monitoring, making it impossible to predict the device's status before testing, increasing manual testing costs and risks. Summary of the Invention

[0003] (I) Purpose of the Invention

[0004] This invention addresses the shortcomings of existing technologies, such as poor reliability, low accuracy, single-channel support, and incomplete functionality. It provides a pyrotechnic target on / off time difference testing device based on a multi-channel high-speed acquisition architecture. This device enables dual-channel synchronous acquisition of detonation signal and target line signal, microsecond-level time difference measurement, and features self-testing, power monitoring, and cyclic charging functions, meeting the high accuracy and high reliability requirements for dynamic parameter analysis of pyrotechnics.

[0005] (II) Technical Solution

[0006] To achieve the above objectives and solve the above technical problems, the technical solution of the present invention is as follows:

[0007] The pyrotechnic target on / off time difference testing device of the present invention requires a computer with professional time difference testing software and at least two-channel oscilloscopes for use. Its core structure and connection relationship are as follows:

[0008] (1) Overall composition

[0009] The main body of the device includes: a built-in battery, a DC step-down module, a power display meter, a function switch, a voltage divider resistor, a high-speed data acquisition module, a signal transmission port, a detection indicator light, a housing, and a panel; the components are connected by wires to form a complete loop of "power supply - signal acquisition - signal monitoring - data transmission".

[0010] (2) Core components and functions

[0011] Built-in battery: One set is provided, using 12V DC specification, to provide power excitation for the entire device and meet the power requirements of various functions such as detonation, signal transmission, and detection;

[0012] DC step-down module: One module is provided. Its input is connected in parallel with the built-in battery. It can step down the 12V battery voltage to a stable value and provide a stable working voltage for the target line signal at the output.

[0013] Power display: One unit is set up and connected in parallel with the built-in battery. It can display the remaining power of the device in real time to avoid the test being affected by insufficient power.

[0014] Function switches: There are 5 switches in total, labeled SA1~SA3 and SB1~SB2 respectively. SA1 is the main power switch, used to control the overall circuit on / off; SA2 is the target wire switch, used to control the target wire.

[0015] Circuit on / off; SA3 is the detonation preparation switch, used to trigger the detonation preparation state; SB1 is the detection switch, used to initiate circuit self-test; SB2 is the ignition switch, used to trigger the detonation signal output;

[0016] Voltage divider resistors: There are 3 in total, labeled R1 to R3. R1 is the voltage divider resistor for the target line signal, with an operating voltage of 5.0V, which can stabilize the target line signal; R2 is the voltage divider resistor for the detection indicator, which can work with the detection indicator light to realize the self-test circuit function; R3 is the voltage divider resistor for the detonation signal, with an operating voltage of 8.0V, which can stabilize the detonation signal.

[0017] High-speed data acquisition module: One module is set up with at least two channels. The sampling voltage range is 0 to 10V, and the dual-channel sampling rate is not less than 125kS / s. It is equipped with an FPGA (Field Programmable Gate Array) to realize multi-channel parallel processing. The sampling time interval accuracy is ±8μs. It is equipped with multiple secondary development design languages ​​to realize signal programming and analysis functions.

[0018] Signal transmission ports: A total of 7 ports are provided, including 2 detonation ports for connecting the detonation wire; 2 target wire ports for connecting the target wire; 1 BNC1 detonation signal port for connecting oscilloscope channel 1 to monitor the detonation signal; 1 BNC2 target wire signal port for connecting oscilloscope channel 2 to monitor the target wire signal; and 1 USB port for connecting to a computer for data communication.

[0019] Test indicator light: 1 light is set and linked to the SB1 test switch. When SB1 is closed, the light will turn on, indicating that the self-test circuit is closed and the circuit continuity test can be performed.

[0020] Housing and panel: 1 set is provided. The housing is made of insulating material and has electromagnetic interference protection function. The panel is made of aluminum alloy and is divided into control areas and device mounting holes to facilitate component installation and operation.

[0021] (3) Key technical features of the present invention 1) Distributed triggering and differential transmission: The detonation signal and target line on / off event are captured in real time by a high-speed data acquisition module, and differential signal transmission technology is used to eliminate common-mode interference and significantly reduce the false triggering rate; 2) High-precision clock and parallel processing: The built-in FPGA realizes multi-channel parallel processing, and the time difference calculation unit is equipped with a high-precision onboard clock oscillator. After frequency division by the logic control circuit, a stable clock signal is provided to realize microsecond-level time interval measurement;

[0022] 3) Multifunctional integration: Integrated circuit self-test, power display, and cyclic charging functions enhance the practicality and reliability of the device.

[0023] (III) Effective Returns

[0024] 1) It adopts a multi-channel high-speed acquisition architecture, supports dual-channel synchronous acquisition, and solves the problem that a single channel cannot monitor multiple signals.

[0025] 2) By using differential signal transmission and FPGA parallel processing, common-mode interference is effectively suppressed and signal stability is improved; the time difference measurement accuracy reaches ±8μs, which is a significant improvement over existing technologies and meets the microsecond-level testing requirements of pyrotechnics.

[0026] 3) It has functions such as circuit self-test, power display, and cyclic charging. It is easy to operate, has a low false trigger rate, and is highly reliable and practical. Attached Figure Description

[0027] Figure 1 This is the circuit schematic diagram of the present invention;

[0028] The components are as follows: 1-Charging port, 2-Built-in battery, 3-Main power switch (SA1), 4-Power display, 5-DC step-down module, 6-Target line switch (SA2), 7-Target line port, 8-Target line signal port (BNC2), 9-Target line signal voltage divider resistor (R1), 10-Detection indicator light, 11-Detection switch (SB1), 12-Detection indicator voltage divider resistor (R2), 13-Pre-explosion switch (SA3), 14-Ignition switch (SB2), 15-Detonation port, 16-Detonation signal voltage divider resistor (R3), 17-Detonation signal port (BNC1), 18-High-speed data acquisition module;

[0029] Figure 2 This is a schematic diagram of the control panel of the present invention;

[0030] Figure 3 This is a flowchart illustrating the operation of the present invention.

[0031] Among them: (1) Device function check flowchart, (2) Time difference test flowchart;

[0032] Figure 4 This is a test curve diagram for the present invention;

[0033] Among them: (1) the test curve time difference is 4.976ms; (2) the test curve time difference is 5.224ms; (3) the test curve time difference is 6.464ms. Detailed Implementation

[0034] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0035] 1. Device setup steps

[0036] according to Figure 1 (Circuit schematic) Build the circuit, according to... Figure 2 (Control Panel) Opening, Press Figure 3 (Operation Procedure) Debugging, the specific steps are as follows:

[0037] 1) Power supply circuit setup: Select a 12V built-in battery, reserve installation space inside the casing and fix it in place; open a charging port on the panel to realize cyclic charging; connect the main power switch (SA1), power display meter and battery in parallel to control power supply on / off and power display;

[0038] 2) Step-down and target line circuit construction: Connect the input terminal of the DC step-down module in parallel with the battery, and connect the output terminal to the target line port (7) and the target line signal voltage divider resistor (R1, 9); connect the target line signal port (BNC2, 8) in parallel across R1 to connect to oscilloscope channel 2;

[0039] 3) Self-test circuit setup: Series detection switch (SB1, 11) and detection indicator voltage divider resistor (R2, 12) are connected in parallel with the detonation circuit to realize the self-test function; Detection indicator light (10) is connected in parallel with detection indicator voltage divider resistor (R2, 12) to indicate the self-test status;

[0040] 4) Detonation circuit setup: Connect the detonation signal voltage divider resistor (R3, 16) in series with R2, and connect the detonation signal port (BNC1, 17) in parallel across R3 to connect to oscilloscope channel 1; connect the detonation port (15), the pre-detonation switch (SA3, 13), and the ignition switch (SB2, 14) in parallel with R2 and SB1 circuit to form the detonation control branch;

[0041] 5) Data acquisition loop setup: Connect R3 to channel 1 of the high-speed data acquisition module (18) and connect R1 to channel 2; connect to the computer via USB port, install professional testing software (e.g., based on Visual Studio C# development), and load the module driver.

[0042] 2. Test Operation Procedure

[0043] (1) Device function check (corresponding) Figure 3 (1)

[0044] 1) Turn on SA1 (main power switch), check the power display, and ensure that the power meets the test requirements (e.g., ≥80%);

[0045] 2) Connect external devices: Connect BNC1 (detonation signal port) to oscilloscope channel 1, BNC2 (target line signal port) to oscilloscope channel 2, and USB port to computer; connect target line 1 and target line 2 with jumper wires;

[0046] 3) Start the test software, press SA2 (target line switch), the software starts to acquire signals; press SB1 (detection switch), the detection indicator light will light up, disconnect the target line jumper wire;

[0047] 4) Store the data and compare the signal time difference analyzed by the software with the acquisition time difference of the oscilloscope. If the difference is very small (e.g., ≤±1μs), the device is considered to be functioning normally.

[0048] (2) Line layout inspection

[0049] 1) Connect the detonation wire to the test sample igniter, and fix the target wire to the muzzle of the test sample and overlap it;

[0050] 2) Use a detonator tester to check the detonating wire (no short circuit or open circuit) and the target wire circuit (normal conduction) to ensure that the circuit is fault-free.

[0051] (3) Time difference test (corresponding) Figure 3 (2)

[0052] 1) Personnel evacuation: Personnel in the test area shall be evacuated to a safe area;

[0053] 2) Line connection: Connect the detonating wire to the detonation port (15), the target wire to the target wire port (7), and the USB to the computer;

[0054] 3) Test start: Turn on SA1, press SA3 (explosion test switch) to start the test software; press SB2 (ignition switch) and the software will automatically save the test data.

[0055] 4) Data analysis: Read the test data stored in the software, view the test curves, and calculate the time difference between the detonation signal and the target line signal.

[0056] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A device for testing the time difference of a pyrotechnic target's on / off state, requiring the use of a computer with professional time difference testing software and at least a two-channel oscilloscope, characterized in that... include: Built-in battery (2) provides 12V DC power to the device; DC step-down module (5) is connected in parallel with the built-in battery (2) at its input end and provides a stable voltage for the target line circuit at its output end; power display (4) is connected in parallel with the built-in battery (2) to display the remaining power in real time; 5 function switches, including the main power switch (SA1, 3), target line switch (SA2, 6), detonation switch (SA3, 13), detection switch (SB1, 11), and ignition switch (SB2, 14), control the power supply on / off, target line circuit, detonation preparation, self-test start, and detonation trigger, respectively; 3 voltage divider resistors, including the target line signal voltage divider resistor (R1, 9), the detection indicator voltage divider resistor (R2, 12), and the detonation signal voltage divider resistor (R3, 16), stabilize the target line signal, form a self-test circuit, and stabilize the detonation signal, respectively; high-speed data acquisition module (18), containing at least 2 One channel, with built-in FPGA to realize multi-channel parallel processing, supporting communication with computer via USB; 7 signal transmission ports, including 2 detonation ports (15), 2 target line ports (7), detonation signal ports (BNC1, 17), target line signal ports (BNC2, 8), and USB port, which are respectively connected to the detonation line, target line, oscilloscope channel 1, oscilloscope channel 2, and computer; detection indicator (10), which is linked with the detection switch (SB1, 11) to indicate the status of the self-test circuit; insulating shell and aluminum alloy panel, with reserved installation space inside the shell, and charging port and device mounting holes on the panel.

2. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The built-in battery (2) works in conjunction with the panel charging port to achieve cyclic charging.

3. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The high-speed data acquisition module (18) supports multiple secondary development design languages. The professional computer-side testing software is developed based on this language and can realize signal acquisition, data storage, and time difference analysis functions.

4. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The detonation signal voltage divider resistor (R3, 16) is connected to channel 1 of the high-speed data acquisition module (18), and the target line signal voltage divider resistor (R1, 9) is connected to channel 2, forming a dual-channel synchronous acquisition circuit.

5. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The detection indicator light (10), detection switch (SB1, 11), and detection indicator voltage divider resistor (R2, 12) are connected in series to form a self-test circuit. During self-test, the detection switch (SB1, 11) is closed and the indicator light is on, which can help to troubleshoot short circuit or open circuit faults in the circuit.

6. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The detonation signal port (BNC1, 17) is connected in parallel to both ends of R3 (16), and the target signal port (BNC2, 8) is connected in parallel to both ends of R1 (9), which are respectively connected to oscilloscope channel 1 and channel 2 to realize real-time signal monitoring.

7. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The time difference calculation unit is equipped with a high-precision onboard clock oscillator, which generates a clock signal after frequency division by the onboard logic control circuit. This clock signal is used to trigger the analog signal conversion at regular intervals, ensuring the time difference measurement accuracy is ±8μs.

8. The pyrotechnic target on / off time difference testing device according to claim 1, characterized in that, The signal transmission uses differential signal transmission technology to eliminate common-mode interference such as electromagnetic noise, and significantly reduce the false trigger rate.

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