Method for calibrating liquid temperature and pressure monitoring sensor in pipe
A temperature sensor and pressure sensor technology, applied in the field of sensors, can solve problems such as pressure offset, temperature drift, and low temperature accuracy, and achieve the effects of improving measurement accuracy, solving pressure measurement errors, and simple structure
Active Publication Date: 2019-03-29
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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Problems solved by technology
[0003] The platinum resistance temperature sensor will be affected by the parameters of the calculation model, resulting in low accuracy of the measured temperature. The ceramic pressure sensor will be affected by temperature and pressure at the same time, which will cause the measured pressure to shift and cause temperature drift; therefore, the actual temperature used Both the sensor and the pressure sensor need to be calibrated in the later stage to achieve the required measurement accuracy
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[0047] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.
[0048] The embodiment of the present invention discloses a method for calibrating a liquid temperature and pressure monitoring sensor in a pipeline, wherein the liquid temperature monitoring sensor is a platinum resistance temperature sensor; the liquid pressure monitoring sensor is a ceramic pressure sensor;
[0049] Such as figure 1 As shown, the calibration method includes the following steps:
[0050] Platinum resistance temperature sensor calibration steps: set the step test water temperature in the constant temperature water tank to obtain the water temperature standard value; at each standard water temperature, collect and process the temperatur...
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The invention relates to a method for calibrating a liquid temperature and pressure monitoring sensor in a pipe. The method comprises the steps of a platinum temperature sensor calibrating step, namely setting step testing water temperatures in a constant-temperature water tank, obtaining a standard water temperature, acquiring and processing a temperature sensor signal for obtaining a measured water temperature; establishing a temperature calibrating model according to the standard water temperature and the measured water temperature, calibrating the water temperature which is measured by a sensor; a ceramic pressure sensor calibrating step, namely measuring a step temperature drift testing water temperature which is set in the constant-temperature water trough by means of the calibratedtemperature sensor; at each water temperature , successively inputting step water pressures, and obtaining output voltages of a pressure sensor; according to the water temperature, the input water pressure and the voltage, establishing a temperature drift calibration model of the pressure, and calibrating the water pressure which is measured by the pressure sensor. The method settles a problem ofa temperature measurement error of the temperature sensor and a pressure measurement error of the pressure sensor and further improves measurement precision of the temperature sensor and the pressuresensor.
Description
technical field [0001] The invention relates to the technical field of sensors, in particular to a method for calibrating liquid temperature and pressure monitoring sensors in pipelines. Background technique [0002] The temperature and pressure inside the liquid are important physical quantities that reflect the state of the liquid medium itself. In various types of industrial pipelines, the temperature sensor and pressure sensor equipment located at each node position are traditionally used to monitor the state of the liquid medium conveyed in the pipeline. In terms of temperature measurement, platinum resistance temperature sensors (PRTDs for short) are commonly used as sensitive cores to penetrate into the liquid medium. According to the Callendar-Van Dusen formula, the real-time resistance of the platinum resistor is directly related to the liquid temperature; in terms of pressure measurement, the sensitive core can use a ceramic pressure sensor to convert the medium p...
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IPC IPC(8): G01K15/00G01L27/00
CPCG01K15/005G01L27/002
Inventor 云峰赵川李舒悦许振丰
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST