Title:
IN-VIVO TEMPERATURE MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JPS63171331
Kind Code:
A
Abstract:
PURPOSE:To accurately measure temperature by forming a loop for phase- synchronizing a transmitter, a sensor and a receiver when a transmission frequency agrees with the resonant frequency of the sensor and providing means for catching the resonant frequency of the sensor. CONSTITUTION:Clock pulses outputted from a clock oscillator 5 are transmitted from an antenna 12 as radio wave via a frequency divider 6, a counter 7, a D/A converter 8, a level shifting circuit, a voltage control variable frequency oscillator 9, a frequency multiplier 10 and a power amplifier 11. The multiplier 10 and the amplifier 11 are inputted with the output of the frequency divider 6 to be on/off-controlled. An intermediate frequency is obtained from received reverberation frequency via an attenuator 13, a high frequency amplifier 14, a mixer 15 and a demodulator 17 to be applied to an AND gate 19. Further, the gate 19 is applied with the output of the frequency divider 6 to make the attenuator 13 conduct attenuation at a prescribed level. When a reception becomes impossible due to the attenuator 13, number of steps up to the maximum value of the reception level of a transmission frequency is counted 21 and a corresponding temperature is displayed 23 by a driving circuit 22.
Inventors:
FUNAKUBO HIROYASU
KOJIMA SEIJI
ISHIGAMI SUMIYUKI
KOJIMA SEIJI
ISHIGAMI SUMIYUKI
Application Number:
JP31368487A
Publication Date:
July 15, 1988
Filing Date:
December 11, 1987
Export Citation:
Assignee:
FUNAKUBO HIROYASU
TOKYO DENPA KK
TOKYO DENPA KK
International Classes:
G01K7/32; A61B5/00; A61B5/01; (IPC1-7): A61B5/00; G01K7/32
Attorney, Agent or Firm:
Teruo Taniyama (3 outside)