Abstract
A wireless passive pressure measurement system for an 800 °C high-temperature environment is proposed and the impedance variation caused by the mutual coupling between a read antenna and a LC resonant sensor is analyzed. The system consists of a ceramic-based LC resonant sensor, a readout device for impedance phase interrogation, heat insulating material, and a composite temperature-pressure test platform. Performances of the pressure sensor are measured by the measurement system sufficiently, including pressure sensitivity at room temperature, zero drift from room temperature to 800 °C, and the pressure sensitivity under the 800 °C high temperature environment. The results show that the linearity of sensor is 0.93%, the repeatability is 6.6%, the hysteretic error is 1.67%, and the sensor sensitivity is 374 KHz/bar. The proposed measurement system, with high engineering value, demonstrates good pressure sensing performance in a high temperature environment.
Highlights
There is much innovative research on wireless passive LC resonant sensors for special situations where traditional wired sensors could not be applied
The pressure sensor is placed in the high temperature environment, as shown on the left of Figure 1
Measurements are achieved by the system including the pressure measurement from 0 bar to 2 bar at room temperature, the temperature measurement from room temperature to 800 °C with no pressure, and the pressure measurement from 70 KPa to 190 KPa at 800 °C
Summary
There is much innovative research on wireless passive LC resonant sensors for special situations where traditional wired sensors could not be applied. Sardini and Serpelloni et al [18] have presented research on conditioning electronics for temperature monitoring by extracting the real component and phase of the impedance They developed a sensor designed and fabricated with hybrid MEMS technology which is positioned in a high temperature airtight environment, while the readout antenna is outside in a safe zone. We present a complete wireless passive measurement system of temperatures up to 800 °C inside a hermetic pressure and high temperature environment This system comprises a LC resonance sensor based on alumina ceramic material made by HTCC technology, a read antenna, a RF connection cable, a thermal insulation structure, a resonant phase-shift reading unit, and a computer to monitor and process data. The sensor we designed has a zero resonance frequency under 100 KPa, please keep consistent throughout the paper atmospheric pressure, while there will be a frequency drift as the temperature changes, so it is significative and necessary to test how the zero resonance frequency varies with the temperature under 100 KPa atmospheric pressure
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