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 gaugeInfo
- 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
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.
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)
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 |
-
1979
- 1979-11-13 FR FR7927972A patent/FR2441856A1/en active Granted
Patent Citations (5)
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 |