Class 73/1.85 - Seismic (e.g., geophone) or with optical sensor

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein either (a) the apparatus for proving
No. of patents: 36
Last issue date: 02/05/2008

Number	Title	Issue Date
7326917	Wear monitor for turbo-machine A wear determination device for determining vibration in a turbine engine component to reduce wear in a turbine engine. The wear determination device may be capable of measuring vibrations in a turbine engine component. The vibration measurement may be used to deter...	02/05/2008
7272505	Determination of geophone coupling Information about coupling of a seismic receiver is obtained from a power spectrum for a record acquired at a seismic receiver. In one method, the power spectrum for the record is compared with a reference power spectrum, which may be known a priori or which may be ...	09/18/2007
7225662	Geophone calibration technique Various techniques are described which may be used to facilitate and improve seismic exploration activities. For example, one aspect of the present invention is directed to a technique for enabling in-situ measurement of geophone response parameters. Another aspect ...	06/05/2007
7085194	Methods and systems for calibrating acoustic receivers A method and system for calibrating acoustic receivers (112). The method and system facilitate calibrating the acoustic receivers (112) while they are mounted to a downhole acoustic tool (102). Calibrating the acoustic receivers (112) in ...	08/01/2006
7076398	Method for determining vacuum producer system parameters and performance specifications A vacuum-strength measurement device is utilized to determine vacuum producer system performance specifications and system parameters. A flow ability factor can be determined that represents the effect of system piping and usage area equipment on performance. With t...	07/11/2006
7010974	Method for measuring a fill level A method for a fill level measurement in accordance with the running time principle, which functions dependably over a long period of time, is provided, having a fill level measuring device with an ultrasonic sensor for transmitting and receiving ultrasound, wherein...	03/14/2006
6816434	Seismic detection A method of using a seismic detector including four seismic sensors having axes which are in a substantially tetrahedral configuration, each of the sensors being in a respective signal channel, includes one or more of the following steps: combining outputs from the ...	11/09/2004
6722203	Strong-motion seismological accelerometer system An accelerometer system principally for use in high spatial density urban arrays for near-real-time mapping of strong shaking due to large earthquakes. The present accelerometer system offers research-grade “16-bit resolution” (=90.3 dB dynamic range =20log(2	04/20/2004
6718265	Petrophysical property estimation using an acoustic calibration relationship A method of estimating a petrophysical property of a subsurface area that includes deriving an acoustic calibration relationship correlating acoustic propagation characteristics of a first subsurface area with a petrophysical property of the first subsurface area de...	04/06/2004
6325172	Geophone including laser interferometer An interferometric geophone includes a freely-falling reference mass and an interferometric arrangement to measure motion of a surface to which the geophone is attached. The mass may fall through an evacuated chamber. A carriage arrangement may reposition...	12/04/2001
6295394	Sensor array having a non-fiber optic sensor and a passive fiber optic cable A sensor array includes a fiber optic cable and at least one electro-optical conversion unit connected to the cable. The electro-optical conversion unit includes a housing formed of mating upper and lower covers. The housing includes an interior cavity fo...	09/25/2001
6194706	Methods and systems for locating buried fiber optic cables The invention provides for assessing location and/or proximity to a buried or submerged optical fiber cable. A seismic generator creates seismic pulses, at known frequencies, on the ground (or water) at a first location and the synchronous rotation of the...	02/27/2001
6160762	Optical sensor An element that is sensitive to a pressure or acceleration signal comprises an optical element capable of changing its index of refraction and/or path length in response to a time varying pressure or in response to acceleration and a pliant mounting membe...	12/12/2000
5996416	Seismometer A two- or three-component measuring accelerometer based on an operating principle entirely different from that of conventional accelerometers is realized with a simple arrangement and provided as a two- or three-component measuring seismometer. Planar opt...	12/07/1999
5774415	Geophone normalization process A method is described for controlling the magnetic field strength of an electromagnetic geophone by: a) providing a specified center value each for a geophone sensitivity parameter and a geophone damping parameter; b) magnetizing an electromagnetic geopho...	06/30/1998
5440914	Method of measuring distribution and intensity of ultrasonic waves There is provided a method of measuring three-dimensional distribution of ultrasonic waves which allows simple real time measurement, wherein a multiplicity of bubble-shaped elements, which are trace amounts of gas coated with an extremely thin coating, a...	08/15/1995
5146776	Method for continuously calibrating an optical vibration sensor An optical vibration sensor is automatically calibrated by extracting a beat frequency vibration signal from a vibration signal produced by the optical vibration sensor, computing a resonant frequency of the optical vibration sensor using the beat frequen...	09/15/1992
5113375	Method and apparatus for testing geophones A LCD display is driven by certain elements to indicate the responses of a geophone to various tests as a waveform. Waveforms are displayed for an impulse tests, wherein a current pulse is applied to the geophone and the response is displayed, and for a t...	05/12/1992
4757706	Geophone testing A method and apparatus for testing geophones is provided which utilizes the levitate waveform produced by the geophones upon removal of a levitate current. The levitate waveform is integrated to give an integral value which is proportional to the number o...	07/19/1988
4639901	Method for testing cableless seismic digital field recorders Test features are incorporated in an improved cableless seismic digital recording system recorder. The improved recorder facilitates application of earlier cableless seismic digital recording systems to situations in which seismic-trace data is generated ...	01/27/1987
4594692	Seismic signal generator A system for testing seismic signal recording equipment wherein a test signal is generated which simulates the output of at least one seismic sensing device, and, thereafter, the test signal is applied to the seismic signal recording equipment. The test s...	06/10/1986
4525814	Leakage testing cable connector network Disclosed is test apparatus included in a cable transmission system having intermediate local data units spaced along a cable, one connection to the cable also being to a master or control station. At each data unit, there is an input differential amplifi...	06/25/1985
4493063	Method and apparatus for seismic geophysical exploration A method and apparatus for seismic geophysical exploration is disclosed wherein the seismic exploration system includes a seismic energy source, a central recording and control station, a plurality of geophones, and a plurality of remote geophone monitori...	01/08/1985
4448057	Apparatus and method for testing a geophone during assembly An apparatus and method for testing a geophone during assembly is disclosed. The apparatus includes a light source cooperating with a photocell for generating a voltage signal in response to light. A member for support of the geophone to be tested is loca...	05/15/1984
4392213	Current impulse method and apparatus for testing geophone strings A method and apparatus for testing geophones to measure the response of the geophones and associated circuits and obtain a signal that can be used to deconvolve recorded seismic data. The method comprises applying a constant voltage or current to the geop...	07/05/1983
4375679	Hydrophone acoustic response chamber A method and apparatus for testing individual hydrophones mounted on seismic streamer cables. An irregularly shaped chamber is provided which can be clamped around the cable containing the hydrophone to be tested. An acoustic transducer, such as a loud sp...	03/01/1983
4366561	Method and apparatus for testing a plurality of geophones In a seismic exploration system wherein a plurality of geophones are utilized to detect seismic waves and transduce the detected seismic waves into representative electrical signals, method and apparatus is provided whereby a plurality of remotely located...	12/28/1982
4305274	Waveform generator A waveform generator is provided which is capable of generating simultaneously a plurality of electrical signals which have different waveforms. The waveform generator is completely battery operated and is particularly useful in testing multichannel devic...	12/15/1981
4298969	Method and apparatus for testing the impedances of geophone channels This application relates to seismic data gathering devices and to testing the impedances of the geophone channels of such devices. The invention includes impressing a test current on each channel to be tested, said current developing a test voltage indica...	11/03/1981
4296483	Method and means for measuring geophone parameters A geophone testing apparatus includes a plurality of force detectors upon each of which is mounted a corresponding geophone. An electrical step function is applied to the active elements of the geophones to generate mechanical output transients. The mecha...	10/20/1981
4276619	Impedance and common mode rejection testing of a multi-channel seismic data gathering apparatus This relates to testing the impedance and common mode rejection characteristics of multi-channel seismic data gathering apparatuses. The apparatus embodying the invention includes a signal recording and computing system with a plurality of input channels;...	06/30/1981
4232379	Automatic balancing system for seismic equipment A method and apparatus for reducing ground current interference with electrical signals representative of seismic signals, said electrical signals passing from at least one geophone to a recording system via an electric circuit including a balancing circu...	11/04/1980
4043175	Automatic method and apparatus for digitally indicating response characteristics of geophones of a geophysical data acquisition system This invention relates to an automatic method and apparatus for quick and convenient testing of one or more geophones of a geophysical data acquisition system through the generation and analysis of the impulse response characteristics of such geophones. I...	08/23/1977
4039806	Synthesizer for testing elements of a geophysical data acquisition system This disclosure relates to a non-recursive digital synthesizer for producing a surprisingly accurate synthesized sinusoid suitable for testing elements of a geophysical data acquisition system in either a laboratory or a field environment. In accordance w...	08/02/1977
4015202	Automatic measurement and display of resonance frequencies of seismic detection elements An apparatus and a method are described with which the resonance frequencies of seismic detector elements, such as geophones, hydrophones, or sets of geophones or hydrophones, may be automatically determined and displayed with relatively high precision, e...	03/29/1977
4003018	Method and apparatus for testing a plurality of geophones A method and apparatus for testing a plurality of geophones disposed in either a series or series-parallel arrangement for both their activity and distortion. The activity of geophones is checked by applying a plurality of constant amplitude current pulse...	01/11/1977

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Class 73/1.85 - Seismic (e.g., geophone) or with optical sensor