High-frequency electromagnetic wave sending machine

A transmitter and electromagnetic wave technology, which is used in electromagnetic wave detection, electrical/magnetic detection and measurement for logging records, etc., can solve the problem of transistor amplification ability decline, poor transmission efficiency and impedance matching performance, and cannot guarantee normal operation. and other problems, to achieve the effect of good temperature characteristics and high emission efficiency
CN101338665BInactive Publication Date: 2012-04-18CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2012-04-18
Estimated Expiration
Not applicable · inactive patent

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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.
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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. Contents of the invention ...

Claims

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