JPS571937A - Temperature detector - Google Patents

Temperature detector

Info

Publication number
JPS571937A
JPS571937A JP7494280A JP7494280A JPS571937A JP S571937 A JPS571937 A JP S571937A JP 7494280 A JP7494280 A JP 7494280A JP 7494280 A JP7494280 A JP 7494280A JP S571937 A JPS571937 A JP S571937A
Authority
JP
Japan
Prior art keywords
frequency
output
local oscillator
phase
frequency difference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7494280A
Other languages
Japanese (ja)
Inventor
Shigefumi Morishita
Riichi Kodama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7494280A priority Critical patent/JPS571937A/en
Publication of JPS571937A publication Critical patent/JPS571937A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/32—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using change of resonant frequency of a crystal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

PURPOSE:To make it possible to discriminance the positive and the negative of temperature, by a method wherein a frequency difference signal S1 is obtined by mixing the frequency of the signal sent from an oscillator with the output frequency of a local oscillator at a reference temperature, together with a frequency difference signal S2 which is obtained by mixing said received signal with the output of the local oscillator whose phase has been shifted by 90 deg., and the phases of both frequency difference signals S1 and S2 are detected. CONSTITUTION:The oscillation frequency of an oscillator 20 employing an elastic surface wave resonator 19 is supplied to a mixer 26 through antennas 22 and 23 and mixed with the oscillation output from a local oscillator 25. As a result, a differential frequency between the received signal frequency and the local oscillation output frequency is obtained as an output. This is mixed with the oscillation output from a reference local oscillator 28 in a mixer 29 to obtain a frequency difference signal S1. Moreover, after the phase of the output of the reference local oscillator 28 has been shifted by 90 deg., said output is applied to a mixer 30 and mixed with the received signal to obtain a frequency difference signal S2. The phase difference between these frequency difference signals S1 and S2 is phase-discriminated in a phase comparator 34. According to the output therefrom, positive or negative is displayed on a positive/negative display device 35.
JP7494280A 1980-06-05 1980-06-05 Temperature detector Pending JPS571937A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7494280A JPS571937A (en) 1980-06-05 1980-06-05 Temperature detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7494280A JPS571937A (en) 1980-06-05 1980-06-05 Temperature detector

Publications (1)

Publication Number Publication Date
JPS571937A true JPS571937A (en) 1982-01-07

Family

ID=13561894

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7494280A Pending JPS571937A (en) 1980-06-05 1980-06-05 Temperature detector

Country Status (1)

Country Link
JP (1) JPS571937A (en)

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