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GB1313534A - Electroacoustic investigation apparatus - Google Patents

Electroacoustic investigation apparatus

Info

Publication number
GB1313534A
GB1313534A GB1313534DA GB1313534A GB 1313534 A GB1313534 A GB 1313534A GB 1313534D A GB1313534D A GB 1313534DA GB 1313534 A GB1313534 A GB 1313534A
Authority
GB
United Kingdom
Prior art keywords
amplifier
transistor
modulation
signals
reflections
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.)
Expired
Application number
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.)
Parke Davis and Co LLC
Original Assignee
Parke Davis and Co LLC
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 Parke Davis and Co LLC filed Critical Parke Davis and Co LLC
Publication of GB1313534A publication Critical patent/GB1313534A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/02—Measuring pulse or heart rate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/08—Clinical applications
    • A61B8/0866—Clinical applications involving foetal diagnosis; pre-natal or peri-natal diagnosis of the baby
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/663—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by measuring Doppler frequency shift
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/241—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by using reflection of acoustical waves, i.e. Doppler-effect
    • G01P5/242—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by using reflection of acoustical waves, i.e. Doppler-effect involving continuous, e.g. modulated or unmodulated, waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO 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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S15/523—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Remote Sensing (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Hematology (AREA)
  • Cardiology (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Gynecology & Obstetrics (AREA)
  • Pregnancy & Childbirth (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1313534 Ultrasonic investigation apparatus; transistor amplifying and detecting circuits PARKE DAVIS & CO 6 May 1970 21925/70 Headings H3T and H4D An investigation apparatus includes a linear amplifier for connection to an electroacoustic transducer the amplifier having two cascaded, capacitively coupled field effect transistors and a detector to detect any modulation in the received signals. The central "eye" 3 of transducer 1 is connected to a 5MHz crystal controlled oscillator 2 and radiates C.W. ultrasound. Reflections from a moving target are received by the outer ring 4, which signals are made up of background reflections at the radiated frequency plus Doppler shifted reflections. The transducer linearly adds these signals producing an amplitude modulated wave, the period of the modulation being proportional to the Doppler shift (Fig. 1, not shown). This is superimposed on any modulation due to changes in reflectivity or size of the object. The signals pass through a noise filter 8 to a two stage f.e.t. linear amplifier, the f.e.t. 9 providing a high input impedance. The amplifier feeds a further filter 14 and an f.e.t. detector 15 and R-C integrator 16, 17, whose output is the low frequency modulation envelope. This is amplified by a low output impedance transistor pre-amplifier which feeds an audio amplifier 7 through a transmission line. The audio amplifier 7 comprises a three transistor amplifier whose D.C. conditions are stabilized by providing three series connected diodes to bias the first transistor and by D.C. coupling to the other two (Fig. 3, not shown). The apparatus may be used for measuring heart beat or blood flow, measurement of liquid flow in industrial processes, detection of marine life, or detection of vibration in machines.
GB1313534D 1970-05-06 1970-05-06 Electroacoustic investigation apparatus Expired GB1313534A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB2192570 1970-05-06
DE19702023928 DE2023928A1 (en) 1970-05-06 1970-05-15 Device for the detection of moving, solid or liquid bodies by means of ultrasound
FR7017880A FR2091933B1 (en) 1970-05-06 1970-05-15

Publications (1)

Publication Number Publication Date
GB1313534A true GB1313534A (en) 1973-04-11

Family

ID=27182594

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1313534D Expired GB1313534A (en) 1970-05-06 1970-05-06 Electroacoustic investigation apparatus

Country Status (3)

Country Link
DE (1) DE2023928A1 (en)
FR (1) FR2091933B1 (en)
GB (1) GB1313534A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000698A1 (en) * 1990-01-12 1991-07-18 Hermesmeyer Alexander C Dipl I DEVICE AND METHOD FOR DETECTING THE PRESENCE OF A VEHICLE BY MEANS OF AN ULTRASONIC DEVICE
CN102538952A (en) * 2012-01-12 2012-07-04 中国人民解放军理工大学 High-sensitivity thunder test circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH548196A (en) * 1972-04-19 1974-04-30 Siemens Ag HEART RATE MONITOR WORKING ACCORDING TO THE ULTRASONIC DOPPLER PRINCIPLE.
FR2516781B1 (en) * 1981-11-20 1986-05-30 Cetehor METHOD FOR THE RECORDING OF FETAL MOVEMENTS DURING PREGNANCY AND APPARATUS FOR IMPLEMENTING THE METHOD

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL302841A (en) * 1963-01-02
GB990309A (en) * 1963-05-01 1965-04-28 Atomic Energy Authority Uk Improvements in or relating to electric circuits for matching high impedance signal sources to low impedance loads
DE1798100A1 (en) * 1968-08-22 1971-11-04 Siemens Ag Device for speed measurement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4000698A1 (en) * 1990-01-12 1991-07-18 Hermesmeyer Alexander C Dipl I DEVICE AND METHOD FOR DETECTING THE PRESENCE OF A VEHICLE BY MEANS OF AN ULTRASONIC DEVICE
CN102538952A (en) * 2012-01-12 2012-07-04 中国人民解放军理工大学 High-sensitivity thunder test circuit

Also Published As

Publication number Publication date
DE2023928A1 (en) 1971-12-02
FR2091933A1 (en) 1971-01-21
FR2091933B1 (en) 1974-08-09

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee