A multi-channel pulse phase-controlled acoustic excitation signal generator
An excitation signal and multi-channel technology, which is applied in the direction of vibrating fluid, can solve the problems of complex control logic, invariable amplitude, and low precision, and achieve simple circuit structure, precise adjustment of emission delay, and precise control of emission pulse width Adjustment effect
Inactive Publication Date: 2016-03-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0004] When the pulse signal is used to achieve phase control, the amplitude of the excitation signal is realized by adjusting the input voltage of the pulse transformer. Due to the large number of channels, the output of the high-voltage power supply is directly adjusted to adjust the excitation intensity, and the circuit will become very complicated and large. , is not easy to achieve
Invention patent ZL200610098676.4 proposes to use DSP to control the charging time of the energy storage capacitor to adjust the excitation amplitude. The circuit becomes simplified and easy to implement. However, for the convenience of underground implementation, the patent uses pulsating DC for the charging power supply, which has low precision and the capacitor The capacity is inconsistent, the leakage performance is very different, and the aging degree is inconsistent with time, resulting in different changes in capacity and leakage current, and it is difficult to adjust accurately
[0005] Due to the many channels of the phase-controlled excitation signal generator, each high-voltage transmission channel needs an independent transmission delay and transmission pulse width. Although the control sequence of a single channel is not complicated, the control logic of dozens of channels is very complicated. DSP and other processing Devices cannot achieve precise synchronous control of dozens of channels, and low-density logic devices such as CPLDs require multiple chips, and the circuit design is complex
[0006] At present, the standard acoustic pulse excitation signal generator has fewer channels and the amplitude is not variable. It is difficult to flexibly adjust the emission time and pulse width, and most of the channels are irrelevant, so it cannot realize the precise phase control function. It is necessary to use a large-scale integrated circuit to simplify the system. design
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[0033] Such as figure 1 As shown, the multi-channel pulse phase-controlled acoustic wave excitation signal generator includes a main control unit 1, a high-voltage power supply control unit 2, an analog-to-digital conversion circuit 3, and multiple sets of high-voltage transmitting channels 4. There are 32 groups of high-voltage transmitting channels 4, and the structure is exactly the same. .
[0034] Such as figure 1 , figure 2As shown, the main control unit 1 receives computer commands through the serial port, uses external trigger or timing to start the signal generator to work, and provides acquisition synchronization reference signals for the data acquisition system at the same time; the high-voltage power supply control unit 2, the analog-to-digital conversion circuit 3 and 32 groups The control signal of the high-voltage transmission channel 4 comes from the main control unit 1; the high-voltage power supply control unit 2 provides energy for the capacitor charging ...
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The invention relates to a multi-channel pulse phase control sound wave drive signal generator. The multi-channel pulse phase control sound wave drive signal generator comprises a main control unit, a high-voltage power supply control unit, an analog-digital conversion circuit and a plurality of sets of high voltage transmitting channels, wherein the high voltage transmitting channels are of the same structure. Computer commands are received by the main control unit through a serial port, the signal generator is started to work in an external triggering or timing mode, and a synchronous reference signal is provided at the same time. A control signal of the high-voltage power supply control unit, a control signal of the analog-digital conversion circuit and control signals of the high voltage transmitting channels come from the main control unit. Energy is provided for charging of capacitors of the high voltage transmitting channels by the high-voltage power supply control unit. Charging voltages of the high voltage transmitting channels are collected by the analog-digital conversion circuit in a resistor bleeder mode. Precise adjustment of the output voltage of the multi-channel pulse phase control sound wave drive signal generator is achieved, transmission delay and transmission pulse control width can also be precisely controlled, and the circuit is simple in structure.
Description
technical field [0001] The invention belongs to the field of generation or transmission of general mechanical vibration in operation and transportation classification, in particular, it relates to a multi-channel pulse phase-controlled acoustic wave signal generator applied to well logging acoustic wave excitation, especially relates to an output excitation signal amplitude, A multi-channel pulse phase-controlled acoustic wave excitation signal generator with precisely adjustable launch delay and launch control pulse width. Background technique [0002] In the phased acoustic wave technology, by selecting parameters such as the number of elements of the phased linear array transducer, excitation sequence, excitation interval, excitation intensity and sound source frequency, it is possible to realize the optimization of the deflection of the radiated sound beam and the width of the main lobe of the sound beam. Control, so that the radiated sound waves have directivity, and di...
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IPC IPC(8): B06B1/06
Inventor 成向阳陈雪莲谭宝海郝宪锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)