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An apparatus for detecting fluid modulation signals transmitted by an instrument in a wellbore includes a motion sensor coupled to a selected position on an exterior of a conduit coupled between a discharge side of a fluid pump and an inlet to a pipe string suspended in the wellbore. The instrument

An apparatus for detecting fluid modulation signals transmitted by an instrument in a wellbore includes a motion sensor coupled to a selected position on an exterior of a conduit coupled between a discharge side of a fluid pump and an inlet to a pipe string suspended in the wellbore. The instrument is coupled to the pipe string. A signal detector is in signal communication with the motion sensor.

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1. A method for transmitting downhole measurements to a surface location, the method comprising: deploying a mud pulse telemetry transmitter in a drill string in a subterranean wellbore;causing the mud pulse telemetry transmitter to modulate a flow of drilling fluid in the drill string, said modulat

1. A method for transmitting downhole measurements to a surface location, the method comprising: deploying a mud pulse telemetry transmitter in a drill string in a subterranean wellbore;causing the mud pulse telemetry transmitter to modulate a flow of drilling fluid in the drill string, said modulated flow generating an acoustic signal in the drilling fluid, the acoustic signal representative of the downhole measurements;deploying an accelerometer on an exterior surface of a conduit providing fluid communication between a discharge side of a drilling fluid pump and an inlet to the drill string;using the accelerometer to receive the acoustic signal in the drilling fluid; andconverting said received acoustic signal in the drilling fluid into representations of the downhole measurements;wherein the accelerometer is deployed at a position corresponding to a maximum amplitude of a standing wave generated in the conduit by the mud pulse telemetry transmitter and a minimum amplitude of a noise signal generated in the conduit by a drilling fluid pump. 2. The method of claim 1, wherein the accelerometer comprises a plurality of triaxial accelerometers deployed about a circumference of the conduit; and using the accelerometer comprises using each of the plurality of triaxial accelerometers to receive the acoustic signal in the drilling fluid. 3. The method of claim 2, further comprising combining measurements from each of the plurality of triaxial accelerometers along three mutually orthogonal directions and at a plurality of circumferential positions to maximize a signal to noise ratio of the received acoustic signal in the drilling fluid. 4. The method of claim 1, wherein the conduit comprises a rubber hose providing fluid communication between a standpipe and the inlet to the pipe string. 5. The method of claim 1, wherein the conduit comprises a rubber hose providing fluid communication between the discharge side of a fluid pump and a standpipe. 6. The method of claim 1, wherein: the accelerometer comprises a plurality of triaxial accelerometers deployed along an axis of the conduit; andusing the accelerometer comprises using each of the triaxial accelerometers to receive the acoustic signal in the drilling fluid;wherein at least one of the plurality of triaxial accelerometers is deployed at the position. 7. The method of claim 1 wherein the accelerometer comprises a microelectrical mechanical system accelerometer. 8. The method of claim 1, wherein the conduit comprises a steel standpipe.