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Pressure intensity value determination method and system

A measurement method and measurement system technology, applied in the field of measurement, can solve the problem of large measurement error and can not meet the requirements of engineering accuracy, and achieve the effect of meeting the requirements of high-precision engineering measurement, broad application prospects, and important application value

Active Publication Date: 2017-05-10
武汉立易方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and system for measuring pressure values. When the existing piezoresistive pressure sensor measures the pressure value, when the ambient temperature changes greatly, the measurement error is large and cannot meet the technical problem of engineering accuracy requirements

Method used

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  • Pressure intensity value determination method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A method for measuring pressure value, including the following steps:

[0077] (1) For a pressure sensor including a peripheral amplifier circuit and an analog / digital conversion circuit, collect the digital quantity D output by the digital circuit and the ambient temperature T;

[0078] (2) Obtain the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value;

[0079] Specifically, the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value are determined according to the following method:

[0080] (2-1) Select several calibration pressure values ​​and several calibration temperature values;

[0081] The calibration pressure values ​​are respectively: 0.2kpa, 1kpa, 1.5kpa, 2kpa, 2.5kpa, 3kpa; the calibration temperature values ​​are respectively: -55℃, -35℃, -15℃, 5℃, 25℃, 45 ℃, 65℃, 85℃.

[0082] (2-2) Make the pressure sensor including the peripheral amplifying c...

Embodiment 2

[0092] A method for measuring pressure value, including the following steps:

[0093] (1) For a pressure sensor including a peripheral amplifier circuit and an analog / digital conversion circuit, collect the digital quantity D output by the digital circuit and the ambient temperature T;

[0094] (2) Obtain the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value;

[0095] Specifically, the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value are determined according to the following method:

[0096] (2-1) Select several calibration pressure values ​​and several calibration temperature values;

[0097] The calibration pressure values ​​are respectively: 0.2kpa, 1kpa, 1.5kpa, 2kpa, 2.5kpa, 3kpa; the calibration temperature values ​​are respectively: -55℃, -35℃, -15℃, 5℃, 25℃, 45 ℃, 65℃, 85℃.

[0098] (2-2) Make the pressure sensor including the peripheral amplifying c...

Embodiment 3

[0108] A method for measuring pressure value, including the following steps:

[0109] (1) For a pressure sensor including a peripheral amplifier circuit and an analog / digital conversion circuit, collect the digital quantity D output by the digital circuit and the ambient temperature T;

[0110] (2) Obtain the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value;

[0111] Specifically, the pre-calibrated calibration temperature, calibration digital quantity, and corresponding calibration pressure value are determined according to the following method:

[0112] (2-1) Select several calibration pressure values ​​and several calibration temperature values;

[0113] The calibration pressure values ​​are respectively: 0.2kpa, 1kpa, 1.5kpa, 2kpa, 2.5kpa, 3kpa; the calibration temperature values ​​are respectively: -55℃, -35℃, -15℃, 5℃, 25℃, 45 ℃, 65℃, 85℃.

[0114] (2-2) Make the pressure sensor including the peripheral amplifying c...

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Abstract

The present invention discloses a pressure intensity value determination method and system. The method comprises: (1) collecting the digital value D and the environment temperature T outputted by a digital circuit about the pressure intensity sensor including an amplification circuit and an analog-digital conversion circuit; (2) obtaining a calibration temperature, a calibration digital value and the corresponding calibration pressure intensity value calibrated in advance; and (3) performing temperature compensation according to the digital value D and the environment temperature T to obtain a determined pressure intensity value. The system comprises a determination parameter collection module, a fixed point register module and a compensation calculation module. The pressure intensity value determination method and system perform compensation calculation according to the relation between the digital value D outputted by the pressure intensity sensor according to the environment temperature and the actual pressure intensity value, and the obtained pressure intensity value error is controlled in the limitation of 1% through determination, the high-precision engineering measurement requirement can be satisfied, and the pressure intensity value determination method and system have wide application prospects and important application values in the aspects of the altitude calculation and the indoor navigation.

Description

Technical field [0001] The invention belongs to the field of measurement technology, and more specifically, relates to a method and system for measuring pressure value. Background technique [0002] The current pressure value measurement methods mostly directly use piezoresistive pressure sensors, the principle of which is to use the piezoresistive effect of monocrystalline silicon materials and integrated circuit technology to make sensors. Piezoresistive sensors are often used for the measurement and control of pressure, tension, pressure difference, and other physical quantities that can be transformed into changes in force (such as liquid level, acceleration, weight, strain, flow, and vacuum). [0003] However, the current piezoresistive pressure sensor is affected by temperature due to the physical and chemical characteristics of itself and the peripheral circuit, and the result of the pressure measurement value under the application environment has a large error. In the actu...

Claims

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Application Information

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IPC IPC(8): G01L1/20G01L9/02
CPCG01L1/20G01L9/025
Inventor 张磊
Owner 武汉立易方科技有限公司
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