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JPS6463857A - Ultrasonic wave receiving signal amplifying circuit and gain control system thereof - Google Patents

Ultrasonic wave receiving signal amplifying circuit and gain control system thereof

Info

Publication number
JPS6463857A
JPS6463857A JP63102724A JP10272488A JPS6463857A JP S6463857 A JPS6463857 A JP S6463857A JP 63102724 A JP63102724 A JP 63102724A JP 10272488 A JP10272488 A JP 10272488A JP S6463857 A JPS6463857 A JP S6463857A
Authority
JP
Japan
Prior art keywords
gain
amplifier
ultrasonic wave
reference signal
wave receiving
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.)
Granted
Application number
JP63102724A
Other languages
Japanese (ja)
Other versions
JPH0646193B2 (en
Inventor
Hiroshi Otake
Junichi Kajiwara
Yoshio Akutsu
Katsuyoshi Miyaji
Yoichi Katsuyama
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP63102724A priority Critical patent/JPH0646193B2/en
Publication of JPS6463857A publication Critical patent/JPS6463857A/en
Publication of JPH0646193B2 publication Critical patent/JPH0646193B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To set a gain stepwise, finely and selectively, by adding a reference signal to a variable gain amplifying circuit during a receiving stop period and comparing the output thereof with an objective value to control the gain. CONSTITUTION:In the stop period during the repeating cycle of an ultrasonic wave receiving signal, a reference signal is preliminarily generated from a reference signal generator 22 to be inputted to the terminal 21c of an amplifier 20 and amplifying output is sent out to the (-) phase input of an error amplifier 24. Further, a gain setting signal is sent out to the (+) phase input of said amplifier 24 while the DC voltage level formed by a calibration voltage generating circuit 27 and a gain operator 26 is set as an objective value. A feedback control loop system is controlled by these two inputs and the mu-factor of the amplifier 20 is set to the gain corresponding to the objective value and this gain is kept in the next measuring period.
JP63102724A 1987-05-08 1988-04-27 Ultrasonic reception signal amplification circuit and gain control method thereof Expired - Lifetime JPH0646193B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63102724A JPH0646193B2 (en) 1987-05-08 1988-04-27 Ultrasonic reception signal amplification circuit and gain control method thereof

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP62-126032 1986-05-25
JP62-111763 1987-05-08
JP11176387 1987-05-08
JP12603287 1987-05-25
JP62-129910 1987-05-28
JP12991087 1987-05-28
JP63102724A JPH0646193B2 (en) 1987-05-08 1988-04-27 Ultrasonic reception signal amplification circuit and gain control method thereof

Publications (2)

Publication Number Publication Date
JPS6463857A true JPS6463857A (en) 1989-03-09
JPH0646193B2 JPH0646193B2 (en) 1994-06-15

Family

ID=27469040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63102724A Expired - Lifetime JPH0646193B2 (en) 1987-05-08 1988-04-27 Ultrasonic reception signal amplification circuit and gain control method thereof

Country Status (1)

Country Link
JP (1) JPH0646193B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0337589A (en) * 1989-07-04 1991-02-18 Hodaka Denshi Gijutsu Kenkyusho:Kk Detector for seam, hole or the like in cloth seam or the like hole in cloth
JPH05100012A (en) * 1991-10-04 1993-04-23 Nec Corp Preprocessing device for soner

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140251A (en) * 1980-04-04 1981-11-02 Hitachi Ltd Supersonic wave flaw detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140251A (en) * 1980-04-04 1981-11-02 Hitachi Ltd Supersonic wave flaw detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0337589A (en) * 1989-07-04 1991-02-18 Hodaka Denshi Gijutsu Kenkyusho:Kk Detector for seam, hole or the like in cloth seam or the like hole in cloth
JPH05100012A (en) * 1991-10-04 1993-04-23 Nec Corp Preprocessing device for soner

Also Published As

Publication number Publication date
JPH0646193B2 (en) 1994-06-15

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