GB1289847A - - Google Patents

Info

Publication number
GB1289847A
GB1289847A GB1289847DA GB1289847A GB 1289847 A GB1289847 A GB 1289847A GB 1289847D A GB1289847D A GB 1289847DA GB 1289847 A GB1289847 A GB 1289847A
Authority
GB
United Kingdom
Prior art keywords
detectors
output
amplifier
winding
electromagnet
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
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 filed Critical
Publication of GB1289847A publication Critical patent/GB1289847A/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
    • G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
    • G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
    • G01V1/181—Geophones

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)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

1289847 Photo-electric position finding GRAVIMETKICS Inc 3 Oct 1969 48679/69 Heading H4D [Also in Divisions G1 and H2] A seismograph comprises an electromagnetically levitated body 8 which is held in a stable horizontal and vertical positions by the spatial distribution of the magnetic field of an electromagnet. Three photo-detectors 26, 28, 20 are spaced apart at the vertices of an equilateral triangle so that detectors 26, 28 measure horizontal movement and detector 20 vertical movement. A light source 14 is energized by oscillator 10 through modulator 12 to produce a pulsating light of narrow bandwidth which is collimated by lens 16 into a beam which passes around the periphery of disc 8 to illuminate the detectors. The apparatus is contained within a transparent vacuum tight housing 6. In operation a disturbance will result in relative movement of body 8 and cause the output of one or all the detectors 26, 28, 20 to charge. The output of detectors 26, 28, since they will normally charge in opposite directions, are added at resistor 40 and applied to amplifier 42 whereas the output of detector 20 is applied direct to amplifier 42. The output of amplifier 42 is integrated at capacitor 43 and applied to winding 44 of electromagnet 48. The energization level of winding 44 is monitored by winding 46 whose output can be recorded or supplied to a computer as a measure of the disturbing force.
GB1289847D 1969-10-03 1969-10-03 Expired GB1289847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4867969 1969-10-03

Publications (1)

Publication Number Publication Date
GB1289847A true GB1289847A (en) 1972-09-20

Family

ID=10449522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1289847D Expired GB1289847A (en) 1969-10-03 1969-10-03

Country Status (1)

Country Link
GB (1) GB1289847A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2001627C2 (en) * 2007-10-24 2009-04-27 Magnetic Innovations B V Speed sensor.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2001627C2 (en) * 2007-10-24 2009-04-27 Magnetic Innovations B V Speed sensor.
WO2009054724A2 (en) * 2007-10-24 2009-04-30 Magnetic Innovations Bv Speed sensor
WO2009054724A3 (en) * 2007-10-24 2010-10-21 Magnetic Innovations Bv Speed sensor

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees