FR2371182A1 - Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade - Google Patents

Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade

Info

Publication number
FR2371182A1
FR2371182A1 FR7634550A FR7634550A FR2371182A1 FR 2371182 A1 FR2371182 A1 FR 2371182A1 FR 7634550 A FR7634550 A FR 7634550A FR 7634550 A FR7634550 A FR 7634550A FR 2371182 A1 FR2371182 A1 FR 2371182A1
Authority
FR
France
Prior art keywords
cascade
receiver
pass filter
low frequency
band pass
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
FR7634550A
Other languages
French (fr)
Other versions
FR2371182B1 (en
Inventor
Clement Guillaud
Herve Moulinier
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Priority to FR7634550A priority Critical patent/FR2371182A1/en
Publication of FR2371182A1 publication Critical patent/FR2371182A1/en
Application granted granted Critical
Publication of FR2371182B1 publication Critical patent/FR2371182B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/48—Diagnostic techniques
    • A61B8/488—Diagnostic techniques involving Doppler signals

Abstract

The ultrasonic system for detecting bubbles in the blood of the human body, is used on a diver who has been immersed at great depths and subjected to high pressures. The system is a Doppler system, the receiver having a mixer stage and a low frequency amplifier with a band pass filter at its output, the band passed being characteristic of the origin of the detected sound. The filtering stage has three integrated operational amplifiers in cascade, with capacitors between the amplifiers. The intermediate amplifier has a potentiometer to vary its supply voltage. The transmission frequency is 5 MHz and the band passed is between 800 Hz and 4 kHz. The transmitter has a low noise level quarz oscillator.
FR7634550A 1976-11-17 1976-11-17 Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade Granted FR2371182A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7634550A FR2371182A1 (en) 1976-11-17 1976-11-17 Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7634550A FR2371182A1 (en) 1976-11-17 1976-11-17 Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade

Publications (2)

Publication Number Publication Date
FR2371182A1 true FR2371182A1 (en) 1978-06-16
FR2371182B1 FR2371182B1 (en) 1979-04-06

Family

ID=9179996

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7634550A Granted FR2371182A1 (en) 1976-11-17 1976-11-17 Ultrasonic blood bubble monitor - has receiver with low frequency band pass filter stage with three operational amplifiers in cascade

Country Status (1)

Country Link
FR (1) FR2371182A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050040A2 (en) * 1980-10-14 1982-04-21 Purdue Research Foundation A method and apparatus for the detection of impurities in a liquid such as blood
EP0483522A1 (en) * 1990-09-28 1992-05-06 Fujitsu Limited Apparatus for obtaining blood backscattering power excluding clutter components
CN114306825A (en) * 2021-12-28 2022-04-12 安徽皖仪科技股份有限公司 Blood bubble monitoring module and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1268640A (en) * 1968-05-31 1972-03-29 Nat Res Dev Acoustic detection apparatus
FR2101274A5 (en) * 1970-07-17 1972-03-31 France Etat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1268640A (en) * 1968-05-31 1972-03-29 Nat Res Dev Acoustic detection apparatus
FR2101274A5 (en) * 1970-07-17 1972-03-31 France Etat

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050040A2 (en) * 1980-10-14 1982-04-21 Purdue Research Foundation A method and apparatus for the detection of impurities in a liquid such as blood
EP0050040A3 (en) * 1980-10-14 1982-05-12 Purdue Research Foundation A method and apparatus for the detection of impurities in a liquid such as blood
EP0483522A1 (en) * 1990-09-28 1992-05-06 Fujitsu Limited Apparatus for obtaining blood backscattering power excluding clutter components
US5243987A (en) * 1990-09-28 1993-09-14 Fujitsu Limited Apparatus for obtaining blood backscattering power excluding clutter components
CN114306825A (en) * 2021-12-28 2022-04-12 安徽皖仪科技股份有限公司 Blood bubble monitoring module and method
CN114306825B (en) * 2021-12-28 2024-02-09 安徽皖仪科技股份有限公司 Blood bubble monitoring module

Also Published As

Publication number Publication date
FR2371182B1 (en) 1979-04-06

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