Shock wave pressure sensor high and low temperature working characteristic on-load detection system and method

Abstract

The invention relates to a shock wave pressure sensor high and low temperature working characteristic on-load detection system and method. Comprising a temperature control cabinet, a detachable heat preservation box, a quasi-static pressure generation device, a pressure generation oil cylinder, a ventilation pipeline, a detected shock wave pressure sensor and a standard pressure sensor. A to-be-detected shock wave pressure sensor and a standard pressure sensor are installed on the side face of the pressure generation oil cylinder, the pressure generation oil cylinder is fixed in the detachable heat preservation box, the quasi-static pressure generation device generates quasi-static pressure in the pressure generation oil cylinder by knocking a piston rod of the pressure generation oil cylinder, and the temperature control cabinet is communicated with the detachable heat preservation box through a ventilation pipeline. And the temperature in the detachable heat preservation box can be controlled. The environment temperature of the shock wave pressure sensor to be tested is controlled based on the high and low temperature environment simulation device, meanwhile, a pressure load can be applied to the shock wave pressure sensor through the drop hammer or pendulum bob pressure calibration device, and on-load detection of the high and low temperature working characteristics of the shock wave pressure sensor is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensor detection, and in particular relates to a system and method for detecting high and low temperature working characteristics of a shock wave pressure sensor. Background Art

[0002] The magnitude of the explosion shock wave pressure is an important indicator for measuring the destructive power of various types of explosives and warheads. The accurate measurement of shock wave pressure plays a pivotal role in national defense and national economic construction. Using a shock wave pressure sensor to measure shock wave pressure is a common shock wave pressure test method. Shock wave pressure tests are often carried out in the field, and the ambient temperature varies widely. In the northern region, the test ambient temperature may be as low as -30°C in winter, and the temperature of the sensor in a direct sunlight environment may even exceed 50°C in summer. In addition, during the shock wave pressure test, the shock wave is often accompanied by high temperature. Therefore, the working characteristic parameters of the shock wave pressure sensor under different temperature environments, such as sensitivity and linearity, are very important for the accurate measurement of shock wave pressure. Testing the high and low temperature working characteristics of the shock wave pressure sensor is of great significance to the shock wave pressure test.

[0003] The shock wave pressure sensor working characteristic detection method, including static, quasi-static, and dynamic calibration, is mostly carried out at room temperature. The detection results are the working characteristic parameters at room temperature, which fail to reflect the impact of different temperature environments on the working characteristic parameters of the shock wave pressure sensor, and cannot guarantee the accuracy of the test results at different ambient temperatures. At present, the detection of the temperature characteristics of the shock wave pressure sensor is mostly carried out in a high and low temperature box, which makes it difficult to apply pressure loads to the sensor to achieve the determination of the working characteristic parameters at different ambient temperatures.

[0004] Chinese Patent No. 201610455273.4 discloses a pendulum-type shock wave pressure sensor field calibration device, which uses a pendulum to strike the piston rod of a pressure cylinder, squeezing the pressure oil in the cylinder to generate a nearly half-sine pressure pulse, thereby calibrating the working characteristic parameters of the pressure sensor. However, this method is difficult to detect the working characteristics of the sensor at a specified ambient temperature. Summary of the invention

[0005] The object of the present invention is to provide a system and method for detecting the high and low temperature working characteristics of a shock wave pressure sensor.

[0006] The technical solution to achieve the purpose of the present invention is: a high and low temperature working characteristic load detection system of a shock wave pressure sensor, comprising a temperature control cabinet, a detachable insulation box, a quasi-static pressure generating device, a pressure cylinder, a ventilation duct, a shock wave pressure sensor to be detected and a standard pressure sensor;

[0007] The detected shock wave pressure sensor and the standard pressure sensor are installed on the side of the pressure-building cylinder. The pressure-building cylinder is fixed in a detachable insulation box, and the end of the piston rod of the pressure-building cylinder is located outside the detachable insulation box. The quasi-static pressure generating device generates quasi-static pressure in the pressure-building cylinder by knocking the piston rod of the pressure-building cylinder. The temperature control cabinet is connected to the detachable insulation box through a ventilation duct to realize controllable temperature inside the detachable insulation box.

[0008] Furthermore, a temperature sensor is arranged in the detachable thermal insulation box, and the temperature control cabinet adjusts the temperature in the detachable thermal insulation box according to the temperature sensor.

[0009] Furthermore, a wire outlet is provided on the side of the detachable thermal insulation box for leading out the signal wires of the detected shock wave pressure sensor and the standard sensor, and is sealed by a sponge plug.

[0010] Further, the temperature control cabinet includes a circulation fan, a heater and an air compressor unit;

[0011] The air compressor unit cools the air, and the heater heats the air. The heated or cooled air flows through the ventilation duct under the action of the circulating fan to achieve heat exchange.

[0012] Furthermore, the detachable thermal insulation box is fixed to the quasi-static calibration device by bolts, and the detachable thermal insulation box includes an upper cover and a lower cover connected by snaps, and the upper cover and the lower cover are both box-type. An air inlet and an air outlet are provided on the side of the detachable thermal insulation box, and the air inlet and the air outlet are connected to the temperature control cabinet through a ventilation duct.

[0013] Furthermore, the quasi-static pressure generating device uses a pendulum-type quasi-static calibration device or a drop-hammer-type quasi-static calibration device.

[0014] A method for carrying out load detection of high and low temperature working characteristics of a shock wave pressure sensor based on the above system comprises the following steps:

[0015] Set the temperature value T that needs to be tested for the working characteristics of the sensor, and then start the high and low temperature control cabinet;

[0016] When the temperature in the detachable insulation box reaches the specified temperature, the quasi-static calibration device is started to generate near-half-sine quasi-static excitation pressure signals of different amplitudes in the pressure-generating cylinder, and the monitoring results of the excitation signal amplitude by the standard pressure sensor are obtained. Ti , and the output amplitude V of the detected shock wave pressure sensor Ti ;

[0017] Using the monitoring result of the standard pressure sensor as the excitation pressure of the detected shock wave pressure sensor, the output of the calibrated sensor under different inputs is obtained;

[0018] By using the least squares method, p Ti and V Ti Perform linear fitting and obtain the working characteristic curve of the sensor at temperature T:

[0019] V T =k T p+b T (2)

[0020] Where p is the input pressure, V T is the output voltage of the shock wave pressure sensor at temperature T, k T 、b T is the working characteristic curve parameter of the detected shock wave pressure sensor calibrated at this temperature, where k T is the sensitivity of the detected shock wave pressure sensor; the nonlinearity γ of the detected shock wave pressure sensor at temperature T is calculated LT ;

[0021] Adjust the temperature in the detachable incubator to T1, T2, T3, ..., and calibrate the shock wave pressure sensor under different temperature environments to obtain the working characteristic curve of the sensor under different temperature environments, and obtain the sensitivity k of the sensor under the corresponding temperature environment. T1 , k T2 , k T3 ...and the linearity γ LT1 , γ LT1 , γ LT1 ...; thereby obtaining the curve of the sensitivity and linearity of the detected shock wave pressure sensor changing with temperature.

[0022] Compared with the prior art, the present invention has the following significant advantages:

[0023] Different environmental temperatures can be flexibly simulated by the high and low temperature environmental simulation device, thereby changing the working environment temperature of the tested shock wave pressure sensor located in the environmental simulation device.

[0024] While the ambient temperature simulation is being performed, a quasi-static pressure load can be applied to the shock wave pressure sensor through a quasi-static calibration device.

[0025] This method can be used to detect the working characteristics of the shock wave pressure sensor under different temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An on-load detection system for high and low temperature working characteristics of shock wave pressure sensors based on a pendulum-type quasi-static calibration device.

[0027] Figure 2Installation cross-sectional view of the pressure cylinder and insulation box of the on-load detection system for the high and low temperature working characteristics of the shock wave pressure sensor.

[0028] Figure 3 Flow chart of the load detection of high and low temperature working characteristics of shock wave pressure sensor.

[0029] Figure 4 Working characteristic curve of shock wave pressure sensor at different temperatures.

[0030] Figure 5 The sensitivity and linearity curve of shock wave pressure sensor changing with temperature.

[0031] Description of reference numerals:

[0032] 1-temperature control cabinet, 2-detachable insulation box, 3-quasi-static pressure generating device, 4-pressure cylinder, 5-ventilation duct, 6-circulation fan, 7-heater, 8-air compressor unit, 9-outlet, 10-detected shock wave pressure sensor, 11-standard pressure sensor, 12-temperature sensor, 13-air outlet, 14-air inlet. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] The present invention proposes a method for detecting the high and low temperature working characteristics of a temperature-adjustable pressure sensor, which uses a high and low temperature environment simulation device to change the working environment temperature of a shock wave pressure sensor located therein. The method places a pressure-generating cylinder of a quasi-static pressure generating device, a standard pressure sensor installed on the pressure-generating cylinder, and a calibrated pressure sensor in a high and low temperature environment simulation device, and introduces gases of different temperatures into an insulated box of the environmental simulation device to change the ambient temperature, thereby simulating different temperature environments. While simulating different temperature environments, the piston rod assembly of the pressure-generating cylinder can be exposed from the opening at the upper end of the insulated box. Therefore, relying on the existing drop-hammer quasi-static calibration device or the pendulum quasi-static calibration device, a pressure load can be applied to the shock wave pressure sensor installed on the pressure-generating cylinder, thereby realizing the detection of the working characteristics of the shock wave pressure sensor under a specified temperature environment. Relying on the above method, as long as the temperature of the high and low temperature environment simulation device is changed, and the quasi-static calibration device is used to apply a load to the sensor for quasi-static calibration, the working characteristic parameters of the sensor under different temperature environments can be obtained, and the detection of the high and low temperature working characteristic parameters of the shock wave pressure sensor can be realized. This method can be used to obtain the sensitivity of the sensor in the entire temperature operating range and the change of linearity with temperature. The sensitivity of the sensor in the operating temperature range and the linearity when the sensitivity is used can be calculated. Specifically, the calibration device can use a pendulum quasi-static calibration device or a drop-hammer quasi-static calibration device according to different calibration ranges.

[0035] The specific system components of the high and low temperature working characteristics test of the shock wave pressure sensor based on the pendulum quasi-static calibration device are as follows: Figure 1 As shown. Its basic characteristics are: temperature control cabinet 1, detachable insulation box 2, quasi-static pressure generating device 3, ventilation duct 5. Its pressure-generating cylinder 4 is the core component of the quasi-static pressure generating device 3. The quasi-static pressure generating device 3 generates quasi-static pressure in the pressure-generating cylinder by knocking the piston rod of the pressure-generating cylinder 4. The pressure-generating cylinder 4 is located inside the detachable insulation box 2, forming a high and low temperature environment simulation device. The temperature control cabinet 1 is connected to the detachable insulation box 2 through the ventilation duct 5 to achieve heat exchange, thereby controlling the temperature in the insulation box.

[0036] The temperature control cabinet 1 relies on the air compressor unit 8 to cool the air and relies on the heater 7 to heat the air. The temperature sensor 12 installed in the detachable insulated box 2 is used to monitor the air temperature in the insulated box in real time and feedback control. The heated or cooled air is connected to the detachable insulated box 2 through the ventilation duct 5. The circulating fan 6 located in the temperature control cabinet can ensure that the air in the temperature control cabinet 1 and the detachable insulated box 2 can flow through the ventilation duct 5 when the temperature is adjusted, thereby realizing heat exchange.

[0037] The detachable heat preservation box 2 is fixed to the quasi-static calibration device by bolts, and has a detachable heat preservation box cover to facilitate the installation of the pressure-making oil cylinder and the replacement of the sensor. Its detachable heat preservation box cover is connected to the lower half of the heat preservation box by a buckle. The side of the detachable heat preservation box 2 has an air inlet 14 and an air outlet 13, and the air inlet 14 and the air outlet 13 are connected to the temperature control cabinet 1 through the ventilation duct 5. The heated or cooled air is exchanged with the air in the detachable heat preservation box 2 through the ventilation duct 5, thereby realizing heat exchange and temperature control. The side of the detachable heat preservation box 2 is provided with an outlet 9, which is used to lead out the signal lines of the detected shock wave pressure sensor 10 and the standard sensor 11 installed on the side of the pressure-making oil cylinder, and is sealed by a sponge plug. The detachable heat preservation box cover of the detachable heat preservation box 2 has an opening for extending the piston rod of the pressure-making oil cylinder to apply a quasi-static pressure load.

[0038] When testing the high and low temperature working characteristics of the shock wave pressure sensor, the tested shock wave pressure sensor 10 and the standard pressure sensor 11 are installed on the side of the pressure cylinder 4. In order to ensure accurate monitoring of the excitation pressure in the pressure cylinder 4 under different temperature environments, a pressure sensor that is less affected by temperature should be selected as the standard pressure sensor. After the pressure cylinder 4 is installed, the pressure cylinder 4 is fixed in the insulation box 2. The structure after installation is as follows Figure 2 shown.

[0039] The steps for testing the high and low temperature working characteristics of the shock wave pressure sensor are as follows: Figure 3 As shown. The temperature value T required for the sensor working characteristic detection is set through the temperature control cabinet 1, and then the high and low temperature control cabinet 1 is started. The high and low temperature control cabinet 1 will control the heater 7 or the air compressor unit 8 to adjust the temperature in the detachable insulation box according to the set temperature value. When the temperature in the detachable insulation box 2 reaches the specified temperature, the pendulum-type quasi-static calibration device 3 is started to generate a nearly half-sine quasi-static excitation pressure signal of different amplitudes in the pressure-generating cylinder 4, and the monitoring result p of the excitation signal amplitude of the standard pressure sensor 11 is obtained. Ti , and the output amplitude V of the detected shock wave pressure sensor 10 Ti The monitoring result of the standard pressure sensor 11 is used as the excitation pressure of the pressure sensor 10 to obtain the output of the calibrated sensor under different inputs. Ti and V Ti By performing linear fitting, the working characteristic curve of the sensor at temperature T can be obtained.

[0040] V T =k T p+b T (3)

[0041] Where p is the input pressure, V T is the output voltage of the shock wave pressure sensor at temperature T. k T 、b T is the working characteristic curve parameter of the detected shock wave pressure sensor 10 calibrated at this temperature, where k T is the sensitivity of the detected shock wave pressure sensor 10. At the same time, the nonlinearity γ of the detected shock wave pressure sensor 10 at temperature T can be calculated. LT

[0042] By changing the temperature set in the temperature control cabinet 1, adjusting the temperature in the incubator 2 to T1, T2, T3, ..., respectively, calibrating the sensor to be calibrated in different temperature environments, the working characteristic curve of the sensor in different temperature environments can be obtained, such as Figure 4 As shown. And the sensitivity k of the sensor in the corresponding temperature environment can be obtained T1 , k T2 , k T3 ...and the linearity γ LT1 , γ LT1 , γ LT1 ……. Therefore, the sensitivity and linearity curve of the detected shock wave pressure sensor 10 changing with temperature can be obtained, such as Figure 5 shown.

Claims

1. A high and low temperature working characteristic load detection system of a shock wave pressure sensor, characterized in that: It comprises a temperature control cabinet (1), a detachable heat preservation box (2), a quasi-static pressure generating device (3), a pressure-generating oil cylinder (4), a ventilation duct (5), a detected shock wave pressure sensor (10) and a standard pressure sensor (11); The detected shock wave pressure sensor (10) and the standard pressure sensor (11) are installed on the side of the pressure-generating oil cylinder (4); the pressure-generating oil cylinder (4) is fixed in a detachable heat-insulating box (2), and the end of the piston rod of the pressure-generating oil cylinder (4) is located outside the detachable heat-insulating box (2); the quasi-static pressure generating device (3) generates quasi-static pressure in the pressure-generating oil cylinder by striking the piston rod of the pressure-generating oil cylinder (4); the temperature control cabinet (1) is connected to the detachable heat-insulating box (2) through a ventilation duct (5), so that the temperature in the detachable heat-insulating box (2) can be controlled.

2. The system according to claim 1, characterized in that A temperature sensor (12) is arranged inside the detachable heat preservation box (2), and the temperature control cabinet (1) adjusts the temperature inside the detachable heat preservation box (2) according to the temperature sensor (12).

3. The system according to claim 1, characterized in that A wire outlet (9) is provided on the side of the detachable heat preservation box (2) for leading out the signal wires of the detected shock wave pressure sensor (10) and the standard sensor (11), and is sealed by a sponge plug.

4. The system according to claim 1, characterized in that The temperature control cabinet (1) comprises a circulation fan (6), a heater (7) and an air compressor unit (8); The air compressor unit (8) cools the air, and the heater (7) heats the air. The heated or cooled air flows through the ventilation duct (5) under the action of the circulating fan (6), thereby achieving heat exchange.

5. The system according to claim 1, characterized in that The detachable thermal insulation box (2) is fixed to the quasi-static calibration device by means of bolts. The detachable thermal insulation box comprises an upper cover and a lower cover connected by snap fasteners. Both the upper cover and the lower cover are box-shaped. An air inlet (14) and an air outlet (13) are provided on the side of the detachable thermal insulation box (2). The air inlet (14) and the air outlet (13) are connected to the temperature control cabinet (1) via a ventilation duct (5).

6. The system according to claim 1, characterized in that The quasi-static pressure generating device (3) is a pendulum-type quasi-static calibration device or a drop-hammer-type quasi-static calibration device.

7. A method for carrying out load detection of high and low temperature working characteristics of a shock wave pressure sensor based on the system according to any one of claims 1 to 6, characterized in that: The steps include: Set the temperature value T required for detecting the working characteristics of the sensor, and then start the high and low temperature control cabinet (1); When the temperature in the detachable heat preservation box (2) reaches a specified temperature, the quasi-static calibration device (3) is started to generate near-half-sine quasi-static excitation pressure signals of different amplitudes in the pressure-generating oil cylinder (4), and the monitoring result p of the excitation signal amplitude by the standard pressure sensor (11) is obtained. Ti , and the output amplitude V of the detected shock wave pressure sensor (10) Ti ; Using the monitoring result of the standard pressure sensor (11) as the excitation pressure of the detected shock wave pressure sensor (10), the output of the calibrated sensor under different inputs is obtained; By using the least squares method, p Ti and V Ti Perform linear fitting and obtain the working characteristic curve of the sensor at temperature T: V T =k T p+b T (1) Where p is the input pressure, V T is the output voltage of the shock wave pressure sensor at temperature T, k T , b T is the working characteristic curve parameter of the detected shock wave pressure sensor calibrated at this temperature, where k T is the sensitivity of the detected shock wave pressure sensor; the nonlinearity γ of the detected shock wave pressure sensor at temperature T is calculated LT ; The temperature in the detachable heat preservation box (2) is adjusted to T1, T2, T3, ..., and the shock wave pressure sensor (10) to be calibrated is calibrated in different temperature environments to obtain the working characteristic curve of the sensor in different temperature environments, and the sensitivity k of the sensor in the corresponding temperature environment is obtained. T1 , k T2 , k T3 ...and the linearity γ LT1 , γ LT1 , γ LT1 ...; thereby obtaining the curve of the sensitivity and linearity of the detected shock wave pressure sensor changing with temperature.

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