overview

The temperature measurement host is the core device of the entire system, which emits frequency hopping pulse radio waves to query radio signals (OOK). When the sensor antenna receives the frequency hopping pulse radio waves, it will cause mechanical vibration of the quartz crystal piezoelectric material. The closer the frequency of the hopping pulse wave is to the natural frequency of the piezoelectric material, the larger the mechanical amplitude (inverse piezoelectric effect), and the mechanical vibration of the crystal cannot disappear immediately with the disappearance of the excitation source (the actual echo decays exponentially with time, with a duration of less than 20 microseconds); The residual energy of the mechanical vibration of the crystal will trigger an instantaneous electric field (positive piezoelectric effect) between the electrodes, and there is an antenna between the electrodes. The temperature measurement host captures the instantaneous echo through a precision circuit; The sensor frequency is recovered through Fourier transform, wavelet denoising, and filtering algorithms, and the echo frequency is linearly proportional to the ambient temperature of the crystal material. The current temperature data can be obtained through the algorithm. One host can measure 6 to 12 temperature points, and the temperature measurement host is connected through RS485 communication line in standard MODBUS-RTU protocol format.

　　Technical Parameter