METHOD AND ACOUSTIC THERMOMETER FOR TAKING DISTANT OBJECT TEMPERATURE MEASUREMENTS Russian patent published in 1996 - IPC

FIELD: medicine. SUBSTANCE: method involves placing acoustic receiver 1 on the surface of an object under investigation, recording acoustic noise and comparing the received signal reference signal of the acoustic receiver measuring concurrently the acoustic receiver temperature and calculating temperature in the depth of the object according to a relationship: T_A=K₁(V₁-a•V₂)+T_R-(T_R-T₀) where T_A - temperature in the depth of the object, V₁ is the signal value read from the acoustic receiver bandwidth, V₂ is the signal value read outside of the acoustic receiver bandwidth, T_R is the acoustic receiver temperature, K₁, a, b, T₀ are the acoustic receiver parameters selected due to calibration. The reference signal is recorded outside of the acoustic receiver bandwidth and the acoustic noise is recorded on the 1,3,5...(2i-1) harmonics of the main frequency. Acoustic thermometer has acoustic emission receiver 1 with chamber 2 and piezoelectric transducer 7, high frequency amplifier 19, spectral components detecting unit 21, 22, chamber temperature measuring unit 12 with pickup 11, recording and displaying unit 29, multi- frequency band filter 9, correction unit 23, summer 28, chamber thermal stabilizer 14 with temperature set-point adjustment unit and executive member and unit 17 for measuring surface temperature of the object under examination with pickup 16 placed on the object surface. The spectral components detecting unit has parallel circuits each provided with a high frequency band filter, quadratic detector and low frequency filter. The number of circuits is equal to the number of the band-pass filter bands. Unit 21 additionally has reversible controllable keys. Filter 9 has three induction coils, resistor, capacitor and transformer. EFFECT: enhanced sensitivity of measurements. 10 cl, 8 dwg