Intelligent metal detector

A metal detector, intelligent technology, applied in the field of detectors, can solve the problems of parameter adjustment and self-learning, phase shift and control, etc., to improve the level of intelligence, improve performance and price ratio, stability and reliability Improved effect

Inactive Publication Date: 2005-04-06
SHANGHAI JIAO TONG UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

The sine wave used in this patent is not generated by DSP and digital synthesis chip, so the pha

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Embodiment Construction

[0026] like Figure 1-3As shown, the present invention comprises: digital signal processor 1, man-machine dialogue system 2, direct digital synthesis chip 3,4,5, multiplier 6,7, low-pass filter 8 and 9, transmitting coil 11, transmitting circuit 12 , receiving coil 13, receiving circuit 14. The digital signal processor 1 generates a standard sine wave of 50-400kHz through the direct digital synthesis chip 3, and sends it to the transmitting coil 11 after being amplified by the transmitting circuit 12 to establish an alternating electromagnetic field. The receiving coils 13 are symmetrically distributed on both sides of the transmitting coil. The receiving coil 13 transmits the signal to the receiving circuit 14, which is divided into two paths and sent to the multiplier 6 and the multiplier 7 respectively. The digital signal processor 1 generates two quadrature signals with a phase difference of 90° through the direct digital synthesis chip 4 and the direct digital synthesis...

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Abstract

It is a metal probe in lossless electromagnetism measurement technique field. The digital signal processor generates two paths of signals through two direct digital systemization chips into two multipliers that get two paths of separation signals through two low-pass filters. The data through the A/D conversion is sent to the digital signal processor for analysis and judgments. The human and machine dialogue system comprises single machines communicated with digital signal serial processors.

Description

technical field [0001] The invention relates to a detector in the technical field of non-destructive electromagnetic detection, in particular to an intelligent metal detector. Background technique [0002] Metal detectors can be roughly divided into beat type, self-excited induction type, energy consumption type (power absorption type) and balanced type according to the basic principle and detection circuit. Using the balanced type can get relatively high sensitivity, and can detect metal particles below 1mm. Metal detectors currently on the market are basically implemented with analog circuits. The advantage of using an analog circuit is that the circuit is simple and easy to implement. The disadvantage is that the analog system has poor anti-interference and stability. It is difficult to adjust parameters. The use of digital technology can overcome the problems of analog circuits. There are two digital technology solutions for metal detectors: one is basically using a...

Claims

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Application Information

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IPC IPC(8): G01N22/00G01N35/00
Inventor 项安洪坚潘俊民刘淑琴
Owner SHANGHAI JIAO TONG UNIV
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