High-precision automatic calibration detection system and method based on pressure sensor

Abstract

The invention relates to a high-precision automatic calibration detection system and method based on a pressure sensor. The system comprises a PC, a direct-current voltage stabilization source, a high-precision voltage / current collector, a sensor calibration system, a multi-channel selection controller, a high-low temperature box, a pressure controller and the pressure sensor. The PC is respectively connected with the direct-current voltage-stabilizing source, the high-precision voltage / current collector, the sensor calibration system, the high-low temperature box and the pressure controller, and the direct-current voltage-stabilizing source, the high-precision voltage / current collector, the sensor calibration system, the high-low temperature box and the pressure controller are respectively connected with the pressure sensor through the multi-channel selection controller. The method has the characteristics of reducing the production cost of the pressure sensor, improving the calibration test efficiency and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensor signal conditioning, and in particular relates to a high-precision automatic calibration detection system and method based on a pressure sensor. Background Art

[0002] Currently, traditional pressure sensor cores have large differences, poor calibration accuracy and low degree of automation.

[0003] For traditional multi-channel batch calibration, sensor calibration is still performed sequentially on multiple channels, and automated multi-channel parallel compensation has not been achieved. Therefore, the use of automated multi-channel to parallel compensation can further improve the calibration efficiency on the original basis; and due to the large differences in pressure cores, the calibration pass rate is often not guaranteed during the automatic compensation process. Therefore, the pressure core characteristics can be automatically analyzed to select a suitable calibration algorithm for calibration, thereby improving the sensor calibration pass rate; on the other hand, after calibration, some sensors still cannot meet the accuracy required by users, so the automatic adjustment method can be used to further calculate the compensation parameters, so that the sensor output can achieve higher accuracy. Summary of the invention

[0004] In order to solve the problems of large differences in pressure sensor cores, poor calibration accuracy and low degree of automation, the present invention provides a high-precision automated calibration detection system and method based on pressure sensors. The present invention has the characteristics of reducing the production cost of pressure sensors and improving calibration test efficiency.

[0005] The invention discloses a high-precision automatic calibration and detection system based on a pressure sensor, which is special in that: the high-precision automatic calibration and detection system comprises a PC, a sensor calibration system and a pressure sensor; the sensor calibration system comprises a DC voltage stabilizing source, a high-precision voltage / current collector, a multi-channel selection controller, a high-temperature box and a pressure controller; the PC is respectively connected to the DC voltage stabilizing source, the high-precision voltage / current collector, the high-temperature box and the pressure controller, and the DC voltage stabilizing source, the high-precision voltage / current collector, the high-temperature box and the pressure controller are respectively connected to the pressure sensor through the multi-channel selection controller.

[0006] Furthermore, there are multiple pressure sensors, and each of the multiple pressure sensors is connected to the multi-channel selection controller.

[0007] An automated calibration method for a high-precision automated calibration detection system based on the above-mentioned pressure sensor is special in that: the automated calibration method comprises the following steps:

[0008] 1) When using the system for automatic calibration, perform a device self-check after the system is turned on to determine whether the PC and all devices are communicating normally;

[0009] 2) The PC then powers all pressure sensors by controlling the DC regulated power supply;

[0010] 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor;

[0011] 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the high-precision voltage / current collector is used to collect and store the signals output by the sensor and calculate the calibration data of each pressure sensor;

[0012] 5) When one temperature point is calibrated, the PC controls the high and low temperature chambers to switch the temperature. After the insulation is completed, the pressure control and data acquisition calculation operations are performed again until the last temperature point is calibrated.

[0013] An automated detection method based on the high-precision automated calibration detection system of the pressure sensor described above is special in that the automated detection method comprises the following steps:

[0014] 1) When using the system automatic calibration, the system will perform a device self-check after it is turned on to determine whether the PC and all devices are communicating normally;

[0015] 2) Then power all pressure sensors by controlling the DC regulated power supply;

[0016] 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor;

[0017] 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the signals output by the sensor are collected and stored using a high-precision voltage / current collector;

[0018] 5) When the sensor data collection of a temperature point is completed, the PC controls the temperature box to switch the temperature. After the insulation is completed, the channel is switched to collect data until the data collection of the last temperature point is completed;

[0019] 6) Finally, the data of all stored temperature points are calculated to obtain comprehensive accuracy, linearity, and repeatability indicators. According to the preset indicators, the qualification of the pressure sensor product is determined and a data report is generated.

[0020] The present invention provides a high-precision automatic calibration and detection system based on a pressure sensor, which includes a pressure sensor calibration system and a sensor data acquisition and analysis system; wherein the pressure sensor calibration system is composed of a DC voltage regulator, a high-precision voltage / current collector, a sensor calibration system, a multi-channel selection controller, a high-temperature box and a pressure controller; the sensor data acquisition and analysis system is composed of a high-precision voltage / current collector, a high-temperature box and a multi-channel selection controller. The present invention highly integrates the traditional sensor calibration system with the sensor detection system, automatically controls the power supply, acquisition equipment and calibration system and other equipment through software to complete the pressure sensor calibration, and then automatically switches the mode to control the multi-channel selection controller and other equipment to complete the output signal acquisition after the pressure sensor calibration is completed, and automatically calculates the accuracy, linearity, repeatability and other indicators of the pressure sensor through the software, and forms a data report to automatically judge whether the product is qualified, so as to achieve the purpose of factory inspection, and the whole process does not require human intervention, and fully realizes the automatic operation of the pressure sensor from full-temperature calibration to field inspection. The present invention has the characteristics of reducing the production cost of the pressure sensor and improving the calibration test efficiency.

[0021] The sensor calibration system and the sensor detection system provided by the present invention are highly integrated, and each device can be reused during the sensor calibration and detection process, saving equipment costs, and is also conducive to the regularization of production lines. The automated calibration of the present invention is that the system automatically completes the automatic control of the DC voltage regulator, high-precision collector, pressure controller and temperature box during the sensor calibration process, realizing fully automated calibration and greatly improving the calibration efficiency. The automated detection of the present invention is for sensor products after automatic calibration. The system can automatically control external devices to complete the acquisition of multi-channel sensor voltage / current outputs, store and calculate the comprehensive accuracy, linearity, repeatability and other indicators of the product through system software, automatically form data reports and determine whether the product is qualified, so as to reduce the complexity of the sensor production process.

[0022] Therefore, the present invention has the following advantages:

[0023] 1) The present invention highly integrates the sensor calibration system with the sensor detection system, multiple devices are reused, and equipment costs are saved.

[0024] 2) The present invention controls various devices through software to achieve pressure sensor calibration and finished product testing automation.

[0025] 3) The present invention can automatically store and calculate sensor index data for sensor detection and form data reports, which greatly improves the production efficiency of pressure sensors and also reduces the complexity of pressure sensor production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the system of the present invention;

[0027] Figure 2 It is a flow chart of the automated calibration method of the present invention;

[0028] Figure 3 The figure is a flow chart of the automated detection method of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] See also Figure 1 The structure of a specific embodiment of the high-precision automatic calibration and detection system based on a pressure sensor of the present invention includes a PC, a sensor calibration system and a pressure sensor; the sensor calibration system includes a DC voltage regulator, a high-precision voltage / current collector, a multi-channel selection controller, a high and low temperature box and a pressure controller; the PC is respectively connected to the DC voltage regulator, the high-precision voltage / current collector, the high and low temperature box and the pressure controller, and the DC voltage regulator, the high-precision voltage / current collector, the high and low temperature box and the pressure controller are respectively connected to the pressure sensor through the multi-channel selection controller.

[0031] There are multiple pressure sensors, and all of the multiple pressure sensors are connected to the multi-channel selection controller. In this embodiment, the multi-channel selection controller is a 32-channel selection controller, and there are 32 corresponding pressure sensors.

[0032] See also Figure 2 The automatic calibration of the present invention is that the sensor realizes fully automatic calibration by automatically controlling the pressure controller, high-precision voltage / current collector and temperature box during the calibration process. The specific method is as follows:

[0033] 1) During the automatic calibration process using this system, the device will perform a self-check after the system is turned on to determine whether the PC and all devices are communicating normally;

[0034] 2) The PC then powers all pressure sensors by controlling the DC regulated power supply;

[0035] 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor;

[0036] 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the high-precision voltage / current collector is used to collect and store the signals output by the sensor and calculate the calibration data of each pressure sensor;

[0037] 5) When one temperature point is calibrated, the PC controls the temperature box to switch the temperature. After the insulation is completed, the pressure control and data acquisition calculation are performed again until the last temperature point is calibrated.

[0038] See also Figure 3 The automatic detection of the present invention is used in the process of sensor product detection after the sensor is calibrated. This function realizes fully automatic detection and data storage calculation and generates product reports through automatic control of the pressure controller, high-precision voltage / current collector and temperature box.

[0039] The specific method is as follows:

[0040] 1) During the automatic calibration process using this system, the device will perform a self-check after the system is turned on to determine whether the PC and all devices are communicating normally;

[0041] 2) The PC then powers all pressure sensors by controlling the DC regulated power supply;

[0042] 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor;

[0043] 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the signals output by the sensor are collected and stored using a high-precision voltage / current collector;

[0044] 5) When the sensor data collection of a temperature point is completed, the PC controls the temperature box to switch the temperature. After the insulation is completed, the channel is switched to collect data until the data collection of the last temperature point is completed;

[0045] 6) Finally, the data of all stored temperature points are calculated to obtain comprehensive accuracy, linearity, repeatability and other indicators. According to the preset indicators, the qualification of the pressure sensor product is determined and a data report is generated.

[0046] The above are only specific embodiments disclosed in the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

[0047] The content of the present invention and the technical content not specifically described in the above embodiments are the same as the prior art.

[0048] The present invention is not limited to the above embodiments, and all of the contents of the present invention can be implemented and have the above good effects.

Claims

1. A high-precision automatic calibration and detection system based on a pressure sensor, characterized in that: The high-precision automated calibration and detection system includes a PC, a sensor calibration system and a pressure sensor; the sensor calibration system includes a DC voltage regulator, a high-precision voltage / current collector, a multi-channel selection controller, a high-temperature box and a pressure controller; the PC is respectively connected to the DC voltage regulator, the high-precision voltage / current collector, the high-temperature box and the pressure controller, and the DC voltage regulator, the high-precision voltage / current collector, the high-temperature box and the pressure controller are respectively connected to the pressure sensor through the multi-channel selection controller.

2. The high-precision automatic calibration and detection system based on the pressure sensor according to claim 1 is characterized in that: There are multiple pressure sensors, and all of the multiple pressure sensors are connected to the multi-channel selection controller.

3. An automated calibration method based on the high-precision automated calibration detection system for the pressure sensor according to claim 1, characterized in that: The automated calibration method comprises the following steps: 1) When using the system for automatic calibration, perform a device self-check after the system is turned on to determine whether the PC and all devices are communicating normally; 2) The PC then powers all pressure sensors by controlling the DC regulated power supply; 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor; 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the high-precision voltage / current collector is used to collect and store the signals output by the sensor and calculate the calibration data of each pressure sensor; 5) When one temperature point is calibrated, the PC controls the high and low temperature chambers to switch the temperature. After the insulation is completed, the pressure control and data acquisition calculation operations are performed again until the last temperature point is calibrated.

4. An automated detection method based on the high-precision automated calibration detection system of the pressure sensor according to claim 1, characterized in that: The automated detection method comprises the following steps: 1) When using the system automatic calibration, the system will perform a device self-check after it is turned on to determine whether the PC and all devices are communicating normally; 2) Then power all pressure sensors by controlling the DC regulated power supply; 3) Then control the pressure controller to apply corresponding pressure to the pressure sensor; 4) After the pressure control is stable, the channels are switched by controlling the multi-channel selection controller, and the signals output by the sensor are collected and stored using a high-precision voltage / current collector; 5) When the sensor data collection of a temperature point is completed, the PC controls the temperature box to switch the temperature. After the insulation is completed, the channel is switched to collect data until the data collection of the last temperature point is completed; 6) Finally, the data of all stored temperature points are calculated to obtain comprehensive accuracy, linearity, and repeatability indicators. According to the preset indicators, the qualification of the pressure sensor product is determined and a data report is generated.

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