GB1447873A - Method and apparatus for radiant energy measurement of impedance transitions in media for identification and other purposes - Google Patents

Method and apparatus for radiant energy measurement of impedance transitions in media for identification and other purposes

Info

Publication number
GB1447873A
GB1447873A GB4573573A GB4573573A GB1447873A GB 1447873 A GB1447873 A GB 1447873A GB 4573573 A GB4573573 A GB 4573573A GB 4573573 A GB4573573 A GB 4573573A GB 1447873 A GB1447873 A GB 1447873A
Authority
GB
United Kingdom
Prior art keywords
receiver
impedance
source
energy
receivers
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
GB4573573A
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.)
Bolt Beranek and Newman Inc
Original Assignee
Bolt Beranek and Newman Inc
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 Bolt Beranek and Newman Inc filed Critical Bolt Beranek and Newman Inc
Publication of GB1447873A publication Critical patent/GB1447873A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
    • G01V1/36—Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy
    • G01V1/37—Effecting static or dynamic corrections on records, e.g. correcting spread; Correlating seismic signals; Eliminating effects of unwanted energy specially adapted for seismic systems using continuous agitation of the ground, e.g. using pulse compression of frequency swept signals for enhancement of received signals
    • G01V1/375—Correlating received seismic signals with the emitted source signal
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
    • G01V1/30—Analysis
    • G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

1447873 Wave-energy impedance transition measurement BOLT BERANEK & NEWMAN Inc 1 Oct 1973 [16 Oct 1972] 45735/73 Heading H4D Impedance transistions in a medium are measured by transmitting wave energy into it in a predetermined direction, receiving the energy returned from the medium, deconvolving the transmitted and received energy to produce a reflection impulse-response function, and integrating this function to provide an impedance-transition measurement which may be compared with properties of known media to identify the nature of the medium. The waveenergy may be acoustic, visible or invisible light, radio, microwave or heat. The invention is applicable to seismic exploration, non- destructive testing of laminates, and medical diagnosis. In the Fig. 1 embodiment for investigating the nature and gas content of marine sediments 5, an acoustic pulse source 1 and receivers 2, 3 are supported by a frame 4. Clock pulse generator 6 and the receiver 2 position are adjusted such that the wave travel times from source 1 to a receiver and between receivers are integral multiples of the clock pulse interval, to simplify received signal processing. Closure of switch 8 triggers source 1 and the sweep of a CRO 10 on which the receiver signals are monitored. The receiver signals are sampled, preferably at the Nyquist minimum rate, at intervals defined by the clock pulses and are recorded at 20, 21. From the samples the downgoing (transmitted) and returning waveforms are computed. The two computed waveforms are then convolved, the convolution result is integrated with respect to time, and the resulting acoustic impedance measure is displayed as a function of the wave travel time in the sediments 5. Source 1 may be directional and actuated repeatedly so that successive waveform signals can be averaged to enhance the signal-to-noise ratio. Mechanical or electronic scanning of transducer arrays is also envisaged. The apparatus may be towed by a ship. A single receiver movable vertically may be used instead of the two receivers shown. Receiver signal samples are obtainable by analysis of a photograph of the CRO display.
GB4573573A 1972-10-16 1973-10-01 Method and apparatus for radiant energy measurement of impedance transitions in media for identification and other purposes Expired GB1447873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29802772A 1972-10-16 1972-10-16

Publications (1)

Publication Number Publication Date
GB1447873A true GB1447873A (en) 1976-09-02

Family

ID=23148695

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4573573A Expired GB1447873A (en) 1972-10-16 1973-10-01 Method and apparatus for radiant energy measurement of impedance transitions in media for identification and other purposes

Country Status (6)

Country Link
JP (1) JPS4974974A (en)
CA (1) CA1017049A (en)
DE (1) DE2352318A1 (en)
FR (1) FR2209112A1 (en)
GB (1) GB1447873A (en)
NL (1) NL7314248A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420881A (en) * 2004-12-01 2006-06-07 Westerngeco Ltd Processing seismic data by convolving signal traces
US7447115B2 (en) 2006-12-05 2008-11-04 Westerngeco L.L.C. Processing seismic data using interferometry techniques
US7596055B2 (en) 2006-12-05 2009-09-29 Westerngeco L.L.C. Attenuating unwanted signal using interferometry techniques
GB2536576A (en) * 2015-03-20 2016-09-21 Reece Innovation Centre Ltd Buried object detection system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491622A1 (en) * 1980-10-02 1982-04-09 Rech Geolog Miniere AUTOMATIC APPARATUS FOR CONTINUOUS DETERMINATION OF REFLECTION COEFFICIENTS FROM A SEISMIC SIGNAL
NL8600444A (en) * 1986-02-21 1987-09-16 Optische Ind De Oude Delft Nv DEVICE FOR ULTRA-SOUND DETECTION.
DE3913178C1 (en) * 1989-04-21 1990-07-12 Franz Prof.Dr. 4405 Nottuln De Thyssen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344396A (en) * 1966-04-04 1967-09-26 Pan American Petroleum Corp Seismic surveying by recording the signal used to convolve either up-going or down-going seismic signals to produce the other

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420881A (en) * 2004-12-01 2006-06-07 Westerngeco Ltd Processing seismic data by convolving signal traces
GB2420881B (en) * 2004-12-01 2008-01-16 Westerngeco Ltd Processing seismic data
US8547792B2 (en) 2004-12-01 2013-10-01 Westerngeco L.L.C. Processing seismic data
US7447115B2 (en) 2006-12-05 2008-11-04 Westerngeco L.L.C. Processing seismic data using interferometry techniques
US7596055B2 (en) 2006-12-05 2009-09-29 Westerngeco L.L.C. Attenuating unwanted signal using interferometry techniques
GB2536576A (en) * 2015-03-20 2016-09-21 Reece Innovation Centre Ltd Buried object detection system

Also Published As

Publication number Publication date
JPS4974974A (en) 1974-07-19
FR2209112A1 (en) 1974-06-28
CA1017049A (en) 1977-09-06
NL7314248A (en) 1974-04-18
DE2352318A1 (en) 1974-05-02

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee