JPS55131787A - Ultrasonic distance measuring system - Google Patents

Ultrasonic distance measuring system

Info

Publication number
JPS55131787A
JPS55131787A JP3771079A JP3771079A JPS55131787A JP S55131787 A JPS55131787 A JP S55131787A JP 3771079 A JP3771079 A JP 3771079A JP 3771079 A JP3771079 A JP 3771079A JP S55131787 A JPS55131787 A JP S55131787A
Authority
JP
Japan
Prior art keywords
low frequency
modulated
50hz
oscillator
distance
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
JP3771079A
Inventor
Takehiro Shimizu
Original Assignee
Sofuaade:Kk
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 Sofuaade:Kk filed Critical Sofuaade:Kk
Priority to JP3771079A priority Critical patent/JPS55131787A/en
Publication of JPS55131787A publication Critical patent/JPS55131787A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06Systems determining the position data of a target
    • G01S15/08Systems for measuring distance only
    • G01S15/32Systems for measuring distance only using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves
    • G01S15/36Systems for measuring distance only using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves with phase comparison between the received signal and the contemporaneously transmitted signal

Abstract

PURPOSE:To determine the phase difference of the low frequency transmitted or received for accurate distance by detecting and extracting the modulated low frequency from the ultrasonic wave modulated with low frequency in the measurement of distance to a flat reflection body including the altitude from the water surface. CONSTITUTION:A super high frequency (40kHz) obtained from the oscillator OSC1 is modulated with a low frequency (50Hz) obtained from the oscillator 2 and the modulated output is emitted with a transmitting element 1. The signal received with a receiving element 2 is detected and amplified with a low frequency of 50Hz by means of a detection amplifier DBA incorporated into the band width filter and then, converted into a square wave with a zero-crossing detector ZCD2. On the other hand, after adjusted in the phase with a phase adjusting device PS, the oscillated frequency of 50Hz from the oscillator 2 is provided to the zero-crossing detector ZCD1 to be converted into a square wave. The output of both the detectors ZCD 1 and 2 produces a signal of pulse width corresponding to the phase difference phi in an exclusive ''or'' circuit EX-OR. The means value of the signal is indicated as distance on the digital meter DM incorporated into the AD converter.
JP3771079A 1979-03-31 1979-03-31 Ultrasonic distance measuring system Pending JPS55131787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3771079A JPS55131787A (en) 1979-03-31 1979-03-31 Ultrasonic distance measuring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3771079A JPS55131787A (en) 1979-03-31 1979-03-31 Ultrasonic distance measuring system

Publications (1)

Publication Number Publication Date
JPS55131787A true JPS55131787A (en) 1980-10-13

Family

ID=12505069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3771079A Pending JPS55131787A (en) 1979-03-31 1979-03-31 Ultrasonic distance measuring system

Country Status (1)

Country Link
JP (1) JPS55131787A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895275A (en) * 1981-11-30 1983-06-06 Ryoko Takada Distance measuring device using ultrasonic wave
WO1992016857A1 (en) * 1991-03-22 1992-10-01 Connell Wagner (Qld) Pty. Ltd. A distance measurement system
GB2339021A (en) * 1998-06-30 2000-01-12 Subacoustech Limited Distance measuring systems and aircraft altimeters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895275A (en) * 1981-11-30 1983-06-06 Ryoko Takada Distance measuring device using ultrasonic wave
WO1992016857A1 (en) * 1991-03-22 1992-10-01 Connell Wagner (Qld) Pty. Ltd. A distance measurement system
GB2270979A (en) * 1991-03-22 1994-03-30 Connell Wagner A distance measurement system
US5418758A (en) * 1991-03-22 1995-05-23 Connell Wagner (Old) Pty. Ltd. Distance measurement system
GB2339021A (en) * 1998-06-30 2000-01-12 Subacoustech Limited Distance measuring systems and aircraft altimeters
US6434085B1 (en) 1998-06-30 2002-08-13 Subacoustech Limited Distance measuring systems altimeters and aircraft

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