Pressure sensor linearity calibration device and method
A pressure sensor and verification device technology, which is applied in the direction of measuring devices, measuring fluid pressure, instruments, etc., can solve the problems that the time node is difficult to guarantee, and the pressure sensor verification system is not realistic, so as to simplify the verification and calibration process, simple structure, The effect of cost reduction
Active Publication Date: 2020-08-21
湖北三江航天红林探控有限公司
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Problems solved by technology
As an enterprise, it is not realistic to purchase a pressure sensor verification system with a price of more than 600,000 yuan for the verification of pressure sensors that are not in large quantities. Outsourcing needs to pay expensive verification fees, and the time node is difficult to guarantee
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Embodiment 1
[0057] The accuracy level of the pressure sensor to be verified is 0.1, and at least 6 verification points (including the zero point) are evenly selected within the measurement range; For a working cycle, the pressure sensor should be tested for at least three working cycles, that is, the pressure sensor is verified with 7 verification points and three working cycles. The positive stroke test point pressures are 0MPa, 0.5MPa, 1.0MPa, 1.5MPa, 2.0MPa, 2.5MPa, 3.0MPa and the negative stroke test point pressures are 3.0MPa, 2.5MPa, 2.0MPa, 1.5MPa, 1.0MPa, 0.5 MPa, 0MPa.
[0058] In addition, the maximum deviation between the pressure sensor output-input calibration curve and the fitting line △Y max with full scale output Y FS The percentage of , called linearity ξ, also known as nonlinear error. Linearity ξ is calculated according to formula (1):
[0059]
[0060] where △Y max To take the arithmetic mean of the output values with the selected working line y i the maximu...
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The invention discloses a pressure sensor linearity calibration device which comprises a pressure sensor, a pressure source, a power supply, a reading recording device and a metering device. The pressure source is used for providing pressure values for the pressure sensor to reach the corresponding verification points of the linearity; the power supply is used for supplying power to the pressure sensor; the reading recording device is connected with the pressure sensor and is used for reading the pressure values and the voltage values of the pressure sensor reaching the corresponding verification points of the linearity; the numerical values, read by the reading recording device, of the corresponding verification points, reaching the linearity, of the pressure sensor are input into the metering device, and the metering device automatically calculates the linearity xi of the pressure sensor. The device is simple in structure, high in practicability and low in cost.
Description
technical field [0001] The invention belongs to the technical field of pressure measurement, in particular to a pressure sensor linearity verification device. Background technique [0002] At present, the Institute of Planning and Research uses an automatic pressure sensor verification system to verify the (static) linearity of pressure sensors. The system is mainly composed of main engine, automatic pressurization system (pressure controller), data acquisition device, DC stabilized power supply, computer, special metering device, printer, special test circuit, signal conversion device, special verification workbench and other auxiliary devices. Automatically collect and process data, which belongs to special measuring equipment. As an enterprise, it is not realistic to purchase a pressure sensor verification system with a price of more than 600,000 for the verification of pressure sensors that are not in large quantities. Outsourcing needs to pay expensive verification fee...
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IPC IPC(8): G01L25/00G01L27/00
CPCG01L25/00G01L27/00
Inventor 张远航欧阳坤任涛
Owner 湖北三江航天红林探控有限公司