METHOD AND DEVICE FOR TEMPERATURE MONITORING BASED ON PASSIVE DELAY LINES ON SURFACE ACOUSTIC WAVES WITH ANTI-COLLISION FUNCTION Russian patent published in 2021 - IPC G01K11/22 

FIELD: electronics.

SUBSTANCE: invention relates to the field of electronics and can be used in systems for wireless monitoring of the state of objects in order to prevent emergencies when monitoring physical quantities, in particular temperature. A method for wireless temperature monitoring based on passive delay lines (DL) on surface acoustic waves (SAW) with an anticollision function includes the formation of a set of n sensors, where n is the number of sensors, on SAW delay lines by means of frequency separation of signals, polling the sensors, taking sensor response signals and their processing, in this case, sequentially for each sensor, the signal delay time from the sensor to the interrogator is determined, while the sensors are located in different places of the monitoring object, according to the irregularity of the amplitude-frequency characteristic (AFC) of the parameter S_11i of the reader antenna, which is measured in the interrogator, the SAW delay between transceiving and reflective IDTs, taking into account the propagation time of the interrogation signal from the interrogator to the n-th sensor (the i-th pair of DL) as τ_1i=1/Δf_1i, τ_2i=1/Δf_2i, where Δf_1i is the distance between the nearest large and small maxima of the frequency response of the parameter S_11i, and Δf_2i is the distance between the large maxima of the frequency response of the parameter S_11i, for the i-th pair of DL, the delay between the reflective IDTs of the pair of LP sensor is calculated as , then of different pairs of DLs are compared with each other and with - the delay obtained for the i-th pair of DLs at a known temperature , from the difference and the known coefficient of temperature delay (TDC), the temperature is determined as , where α is TDC.

EFFECT: reduction of losses during reflection of SAW from the sensor, increasing the accuracy of determining the temperature, as well as eliminating the effect of the distance between the sensor and the reader on the accuracy of temperature measurement.

2 cl, 5 dwg