FR2441856A1 - Variable frequency seismic wave generator - utilises adjustment of partial vacuum in cylinder in which piston operates, with pressure indicated on external gauge - Google Patents

Variable frequency seismic wave generator - utilises adjustment of partial vacuum in cylinder in which piston operates, with pressure indicated on external gauge

Info

Publication number
FR2441856A1
FR2441856A1 FR7927972A FR7927972A FR2441856A1 FR 2441856 A1 FR2441856 A1 FR 2441856A1 FR 7927972 A FR7927972 A FR 7927972A FR 7927972 A FR7927972 A FR 7927972A FR 2441856 A1 FR2441856 A1 FR 2441856A1
Authority
FR
France
Prior art keywords
cylinder
piston
partial vacuum
wave generator
variable frequency
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
FR7927972A
Other languages
French (fr)
Other versions
FR2441856B1 (en
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.)
MILLER NORVEL
Original Assignee
MILLER NORVEL
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 MILLER NORVEL filed Critical MILLER NORVEL
Publication of FR2441856A1 publication Critical patent/FR2441856A1/en
Application granted granted Critical
Publication of FR2441856B1 publication Critical patent/FR2441856B1/fr
Granted 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
    • G01V1/02—Generating seismic energy
    • G01V1/143—Generating seismic energy using mechanical driving means, e.g. motor driven shaft
    • G01V1/147—Generating seismic energy using mechanical driving means, e.g. motor driven shaft using impact of dropping masses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/02—Generating seismic energy
    • G01V1/04—Details
    • G01V1/047—Arrangements for coupling the generator to the ground

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

A non-explosive source of variable frequency seismic waves is provided by a piston in a cylinder in which a partial vacuum exists. Pressure vaia tion allows tuning of the acoustic wave frequency. A seismic wave generator (10) mounted on a lorry comprises a cylinder (1 2) with a piston release mechanism (14) at the upper end operated by the excitation of coils (338, 340). A pressure buffer(16) is located at the lower end. Holes (304) in an upper plate (302) allow entry of air to a space (306) above the piston (308). A pin (318) protruding from the rear face of the piston has a conical section (322) which engages the release mechanism. A partial vacuum in the cylinder (12) is achieved via connections (350) to a vacuum pump (366) via a valve (368) which is closed when the required frequency is obtained.
FR7927972A 1978-11-13 1979-11-13 Variable frequency seismic wave generator - utilises adjustment of partial vacuum in cylinder in which piston operates, with pressure indicated on external gauge Granted FR2441856A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US96019978A 1978-11-13 1978-11-13

Publications (2)

Publication Number Publication Date
FR2441856A1 true FR2441856A1 (en) 1980-06-13
FR2441856B1 FR2441856B1 (en) 1984-11-30

Family

ID=25502933

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7927972A Granted FR2441856A1 (en) 1978-11-13 1979-11-13 Variable frequency seismic wave generator - utilises adjustment of partial vacuum in cylinder in which piston operates, with pressure indicated on external gauge

Country Status (1)

Country Link
FR (1) FR2441856A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277437A (en) * 1965-04-05 1966-10-04 Gen Dynamics Corp Acoustic apparatus
US3349867A (en) * 1966-02-23 1967-10-31 Exxon Production Research Co Vacuum energized seismic pulse generator
US3828891A (en) * 1972-12-27 1974-08-13 Texaco Inc Seismic pulse generator
US3866709A (en) * 1973-11-12 1975-02-18 Exxon Production Research Co Vibratory seismic energy generator
US4056164A (en) * 1976-07-21 1977-11-01 Western Geophysical Co. Stabilized portable seismic signal transducer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277437A (en) * 1965-04-05 1966-10-04 Gen Dynamics Corp Acoustic apparatus
US3349867A (en) * 1966-02-23 1967-10-31 Exxon Production Research Co Vacuum energized seismic pulse generator
US3828891A (en) * 1972-12-27 1974-08-13 Texaco Inc Seismic pulse generator
US3866709A (en) * 1973-11-12 1975-02-18 Exxon Production Research Co Vibratory seismic energy generator
US4056164A (en) * 1976-07-21 1977-11-01 Western Geophysical Co. Stabilized portable seismic signal transducer

Also Published As

Publication number Publication date
FR2441856B1 (en) 1984-11-30

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Legal Events

Date Code Title Description
ST Notification of lapse