Abstract: An electric submersible pump (ESP) monitoring system is described herein. The ESP monitoring system includes a base monitoring unit and a discharge monitoring unit that are communicably coupled via a ground path. The discharge monitoring unit is hydraulically coupled to the pump discharge and is configured to measure a discharge parameter relating to the pump discharge and transmit data corresponding to the discharge parameter to the base monitoring unit via the ground path. The base monitoring unit is electrically connected to the motor of the ESP system and is configured to measure a base parameter relating to the motor and/or the pump intake, receive the transmitted data corresponding to the discharge parameter from the discharge monitoring unit, combine the data corresponding to the discharge parameter and the data corresponding to the base parameter, and transmit the combined data to an ESP surface unit via an ESP power cable.

Abstract: One example discloses a reconfigurable analog to digital converter (ADC) device, including: an analog front end (AFE) configured to receive a set of analog input signals and generate a corresponding set of digital output signals; wherein the AFE includes a set of reconfigurable ADC conversion circuits; and a sequencer coupled to the AFE and configured to control the set of reconfigurable ADC conversion circuits with a first AFE channel configuration at a first time and a second AFE channel configuration at a second time.

Abstract: In a pulse-echo ranging system an energy pulse is transmitted to a target, echo pulses are received and converted into an echo signal that is processed to identify an echo from the target and to determine the distance from the propagation time of the identified echo, where the advanced stage of the processing is performed digitally. Instead of storing and processing the echo signal, the first derivative of the whole echo signal is stored in digital form and then processed to allow for storing as large a number of samples possible in a limited memory without reducing the resolution and without complicating the processing.

Abstract: A high capacity digital geophone system capable of distributing seismic data over a computer network connection in a real-time manner. Each geophone can convert seismic energy signals to analog then digital data before forwarding the observed data to a network connection for dissemination. Moreover, each geophone may be embedded with a processing capability that allows for instant front end processing of data. Remote processing computers can then access geophone data over the network connection and feed it into software analysis applications.

Abstract: The method consists in building a common midpoint gather of seismic traces of which the CMP point is said given point, subjecting the traces of this gather to dynamic and/or static corrections, and characterized in that the gather associated with the given point (A) is built by recording four CMP sub-gathers associated with said given point along four angular directions (1 to 4) passing through said given point, and dynamic and/or static corrections are applied to each of the four CMP sub-gathers in order to determine, for each sub-gather, a value of the curvature and/or the velocity optimizing the energy of the trace stack of the corrected sub-gather concerned, the four values thus obtained representing the components of the stacking velocity field desired for each of the reflector elements corresponding to the given point, and characterized by a vertical propagation time t0 with reflection for zero offset.Application in particular to the exploration of a medium with a complex tectonics.

Abstract: An analog-to-digital converter system for converting an input analog signal having a wide dynamic range to a digital output has a non-linear function generator for compressing the wide dynamic range input signal to a reduced dynamic range signal, an analog-to-digital converter of limited dynamic range for converting the reduced dynamic range signal to a digitally formatted signal, and a conversion memory for providing a digital value corresponding to the value of the wide range analog input. The digitally formatted signal addresses a word within the conversion memory, the word so addressed containing a digital value corresponding to the magnitude of the analog input signal. Each word of the conversion memory has a sufficient number of bits for expressing the desired dynamic range of the input signal.

Abstract: The seismic amplifier includes an amplifying circuit which amplifies an analog signal to provide an amplified analog signal. The amplified analog signal is converted to digital signals. A controlled network connected to the amplifier circuit controls the gain of the amplifier circuit in a manner so that the gain for a current seismic operation, except for an initial seismic operation, is determined during the next previous vibration seismic operation.

Abstract: A processor responsive to multiple AC analog signals has individual sampling circuits to sample and hold each AC analog signal in DC form. After the DC signals are multiplexed, a single error correction circuit calculates correction voltages individualized for each sampling circuit and sums them with the DC signals. An instantaneous floating point amplifier amplifies each signal in 12 db increments up to a preselected limit, and then a second sampling circuit holds the amplified signal before an analog-to-digital converter generates a digital signal representative of the amplified signal.

Abstract: A geophone amplifier including a low cut filter which provides non-linear amplification of the signal to produce a substantially flat frequency response so as to enhance high frequency signals containing high resolution information. Discrete plug-in modules are used to custom design the parameters of the system to increase the signal-to-noise ratio and provide a signal which is conditioned for transmission to a data collection unit. Low power drain circuitry is used so that the system can be implemented as a portable unit for conditioning the seismic geophone signal prior to transmission over a long distance.

Abstract: An analog-to-digital converter for use in seismic data processing applications is disclosed which features variants on delta modulation and delta-sigma modulation methods. A series of single bits is output by an analog-to-digital converter based on comparison of a predicted analog signal with the actual analog signal. A low pass filter and subsampling operation is applied to the output digital bits to provide digital words corresponding to the analog signal amplitude. Plural integrator stages are shown which allow reduction of quantization error.

Abstract: A circuit is disclosed for use in an acoustic logging tool incorporating a transmitter sending an acoustic pulse which is received by acoustic receivers. In the preferred and illustrated embodiment hereof, an automatic gain control (AGC) circuit controls the receiver amplification to enable the output range to be limited for input to a digital graphic recorder, typically having a limited number of output signal levels, coordinating with data processing equipment. The AGC times the peak operation to thereby limit the dynamic range.

Abstract: A method of enhancing the signal to noise ratio of seismic data includes the steps of repeatedly obtaining, from at least one array of seismic detectors, analog signals representative of sensed vibrations or pressure waves. Each analog signal is converted to discrete digital values on a time correlation basis until a predetermined quantity of analog signals have been converted. In each time correlation, the two most positive digital values and the two most negative digital values are removed. The remaining values for each time correlation are averaged so as to provide a digital representation of the analog signals.

Abstract: An amplifier system repeatedly samples the voltage level of an analog signal and selects the gain to be applied to successive samplings of such signal in response to the voltage level of the sampled signals to thereby raise the amplitude of each sampled signal to a desired level.

Abstract: An A/D converter used with an A/D conversion system in which each of input analog signals applied thereto is amplified at a gain selected depending or the level of said each signal and subjected to A/D conversion. The A/D converter is arranged to select a desired one of predetermined gain select modes concerned with the selection of gain of the amplifier. Further, the A/D converter produces a reference analog signal of a level corresponding to the selected gain select mode and compares the input analog signal with the reference analog signal, thereby determining whether or not the gain of the amplifier is to be changed.

Abstract: A floating point analog-to-digital converter for use in a digital induction logging tool is disclosed. Floating point samples of phase quadrature components of the receiver signal are obtained. Each sample contains a digital word representing the exponent of a floating point number and digital word representing its magnitude. A voltage-to-frequency converter produces an output frequency proportional to the magnitude of the component signal. The resulting frequency signal is counted over a predetermined time inverval. At the completion of each time interval, the count is shifted until a predetermined magnitude is reached. The number of shift pulses required to reach this magnitude represents the exponent. The resulting shifted count represents its magnitude.

Abstract: An analog-to-digital converter system is disclosed in which the amplitude of the signal is compressed by means including a logging means prior to an analog-to-digital converter. Reference signals of known values are applied to the logging means and their values at the output of the converter are used to determine a linearity factor which is applied to a multiplier coupled to the output of the converter. The amplitude of one of the reference signals at the output of the multiplier is compared with what it should be and the difference is added by an adder at the output of the multiplier.

Abstract: A wide dynamic range automatic high speed gain ranging amplifier system includes a receiver circuit adapted to receive an analog input signal. A single stage amplifier is connected to the receiver circuit which amplifies a received analog signal to provide an output signal. A control circuit connected to the receiver circuit and to the amplifier controls the gain of the amplifier in accordance with the output signal and provides digital gain signals corresponding thereto.