JPS62254087A - Ultrasonic type distance measuring apparatus - Google Patents

Ultrasonic type distance measuring apparatus

Info

Publication number
JPS62254087A
JPS62254087A JP9718386A JP9718386A JPS62254087A JP S62254087 A JPS62254087 A JP S62254087A JP 9718386 A JP9718386 A JP 9718386A JP 9718386 A JP9718386 A JP 9718386A JP S62254087 A JPS62254087 A JP S62254087A
Authority
JP
Japan
Prior art keywords
wave
received signal
threshold
measured
compared
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
JP9718386A
Other languages
Japanese (ja)
Inventor
Toshihiro Fukushima
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP9718386A priority Critical patent/JPS62254087A/en
Publication of JPS62254087A publication Critical patent/JPS62254087A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To achieve a highly accurate measurement, by comparing, with a threshold, received signal levels of reflected ultrasonic waves from an object to be measured and an object to be compared to prevent adverse effect from the reception of a secondary reflected wave positively.
CONSTITUTION: An ultrasonic transmitter/receiver 5 transmits or receives an ultrasonic wave intermittently and received signal levels of reflected ultrasonic waves from an object to be measured and an object to be compared are compared with a threshold by a comparator 4 to produce an output when the received signal level is higher than the threshold. An automatic threshold adjusting means is made up of an integrator 1 comprising a resistance R1, an operational amplifier OP1 and a capacitor C1, a one-shot multivibrator 2 which receives an input of a sensing gate signal GS to output a one-shot signal OS at the rising thereof and an adder 3 comprising variable resistances R31, R32 and ΔR3, an operational amplifier OP2 and a resistance R4. The threshold shall be set higher than the received signal level of a secondary reflected wave from the object being measured based on the preceding wave transmission at the timing of receiving the wave but lower than the received signal levels of a primary reflected wave from the object being measured and a reflected wave from the object being compared based on the current wave transmission at the timing of receiving the waves.
COPYRIGHT: (C)1987,JPO&Japio
JP9718386A 1986-04-25 1986-04-25 Ultrasonic type distance measuring apparatus Pending JPS62254087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9718386A JPS62254087A (en) 1986-04-25 1986-04-25 Ultrasonic type distance measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9718386A JPS62254087A (en) 1986-04-25 1986-04-25 Ultrasonic type distance measuring apparatus

Publications (1)

Publication Number Publication Date
JPS62254087A true JPS62254087A (en) 1987-11-05

Family

ID=14185464

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9718386A Pending JPS62254087A (en) 1986-04-25 1986-04-25 Ultrasonic type distance measuring apparatus

Country Status (1)

Country Link
JP (1) JPS62254087A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008002811A (en) * 2006-06-20 2008-01-10 Daido Signal Co Ltd Pulse radar system for measuring short distance

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59218973A (en) * 1984-05-15 1984-12-10 Matsushita Electric Ind Co Ltd On-vehicle obstacle detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59218973A (en) * 1984-05-15 1984-12-10 Matsushita Electric Ind Co Ltd On-vehicle obstacle detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008002811A (en) * 2006-06-20 2008-01-10 Daido Signal Co Ltd Pulse radar system for measuring short distance

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