High-frequency electromagnetic wave sending machine

A transmitter, electromagnetic wave technology, applied in electromagnetic wave detection, electrical/magnetic detection and measurement for logging records, etc., can solve the problem of transistor amplification capacity decline, poor transmission efficiency and impedance matching performance, and cannot guarantee normal operation. and other problems, to achieve the effect of high emission efficiency and good temperature characteristics

Inactive Publication Date: 2009-01-07
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0002] The transmitter of the high-frequency electromagnetic wave logging tool mainly completes the functions of frequency division, gating, filtering, driving, and power amplification. The output end uses a high-temperature high-frequency transformer to efficiently complete impedance matching and power transmission. Both terminals use resistors and capacitors for impedance matching, and their emission efficiency and impedance matching performance are poor; in addition, as the temperature rises, the amplification capability of the transistor in the transmitter circuit will decrease, which will adversely affect the circuit performance. , cannot guarantee proper operation over a wide temperature range

Method used

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Embodiment Construction

[0021] Below, the present invention is illustrated by taking the logging instrument transmitting circuit of the present invention at two frequencies of 0.8MHz and 6.4MHz as an example:

[0022] like Picture 1-1 and 1-2 As shown, the transmitter of the high-frequency electromagnetic wave logging tool mainly completes the functions of frequency division, gating, filtering, driving and power amplification, and can work normally in a relatively large temperature range of 25 degrees to 150 degrees.

[0023] Since the transmit clock signal is very stable at high temperature, it meets our temperature requirements. The transmit clock signal is passed through a frequency divider to obtain 6.4MHz and 0.8MHz transmit frequency signals. Each of the two transmission signals is connected to the amplifying module of the subsequent stage through an analog switch, and is selected by a gate signal on the analog switch. In this way, under the action of the control signal, the two analog switc...

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Abstract

The present invention relates to a high frequency electromagnetic wave transmitter which comprises a frequency demultiplier, a gating switch, a filter, a transmission drive unit, a power amplification unit and an output end resonance loop which are in electric connection orderly. The output end resonance loop is connected with a transmission coil by a coupling transformer and forms an integral resonance loop together with the coupling transformer and the transmission coil. The transmitter uses the coupling transformer, temperature compensation, seven-step elliptic filter and a transistor C-class amplification circuit; compared with the prior art, the transmitter has the advantages of high transmission efficiency, good temperature characteristic, etc. The circuit design of the transmitter can be fit for various kinds of high frequency electromagnetic wave well logging tools with one or multiple transmission frequencies less than 15MHz and can work normally within a large temperature range between 25 DEG C and 150 DEG C.

Description

technical field [0001] The invention relates to a transmitter, in particular to a high-frequency electromagnetic wave transmitter, in particular to a high-frequency electromagnetic wave logging instrument transmitter. Background technique [0002] The transmitter of the high-frequency electromagnetic wave logging tool mainly completes the functions of frequency division, gating, filtering, driving, and power amplification. The output end uses a high-temperature high-frequency transformer to efficiently complete impedance matching and power transmission. Both terminals use resistors and capacitors for impedance matching, and their emission efficiency and impedance matching performance are poor; in addition, as the temperature rises, the amplification capability of the transistor in the transmitter circuit will decrease, which will adversely affect the circuit performance. , cannot be guaranteed to operate properly over a wide temperature range. SUMMARY OF THE INVENTION [...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00G01V3/30E21B47/13
Inventor 张雷罗曦李焱骏
Owner CHINA NAT OFFSHORE OIL CORP
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