Method and system for improving frequency sweep efficiency of resonant surface acoustic wave temperature measurement system

Abstract

The present invention provides a method and system for improving the frequency sweep efficiency of a resonant surface acoustic wave temperature measurement system, comprising: a frequency sweep range optimization step: optimizing the sweep frequency range to determine the sweep frequency range; a sweep step size optimization step: Sweep frequency within the frequency sweep range with preset step size to determine the final test temperature value. The present invention can effectively improve the frequency scanning efficiency of the system and improve the responsiveness of the system; through the optimization of the frequency scanning range and the frequency scanning step length, the frequency scanning efficiency of the system can be effectively improved, and the responsiveness of the system test can be improved. It meets the real-time requirements of wireless dynamic temperature monitoring of moving parts in various types of reciprocating or rotating mechanical structures, and has great popularization and application value.

Description

technical field [0001] The invention relates to the technical field of wireless passive temperature measurement, in particular to a method and system for improving the frequency sweep efficiency of a resonant surface acoustic wave temperature measurement system. Background technique [0002] Surface Acoustic Wave temperature measurement technology (SurfaceAcousticWave, SAW) is a new temperature measurement technology in recent years. SAW wave speed will change with the change of external environmental factors. influence of this characteristic on thermometry, figure 2 Schematic diagram of surface acoustic wave temperature measurement technology. [0003] The SAW sensor is mainly composed of a piezoelectric substrate, an interdigital transducer, a reflection grid, and an antenna. The reflection grid is composed of periodically distributed metal fingers, and two sets of reflection grids form an acoustic Fabry resonant cavity. When the transmitting / receiving transceiver transm...

AI Technical Summary

Problems solved by technology

[0009] For the wireless passive temperature test system for steady-state temperature monitoring applications, the frequency sweep strategy will inevitably cause a lag in system response, which cannot meet the real-time requirements for dynamic temperature change monitoring in reciprocating or rotating mechanical structures such as connecting rods and bearing bushes.

[0010] Patent document CN104990625B (application number: 201510342196.7) discloses a wireless test circuit for a resonant surface acoustic wave sensor. Aiming at the problems of high cost, slow detection rate and high detection accuracy of traditional wireless passive SAW sensor test circuits, the present invention tests The circuit includes a transmitting unit, a receiving unit, a radio frequency switch and a signal processing unit, wherein the transmitting unit comprises a signal generator and a power amplifier connected in sequence, and the receiving unit comprises a low noise amplifier, a power detector and a power amplifier connected in sequence Low-pass filter, the signal processing unit includes an A / D acquisition module and a digital signal processor connected in sequence; the transmitting unit and the receiving unit are respectively connected with the radio frequency switch, and the signal processing unit is connected with the receiving unit

Images