METAL DETECTOR
The present invention relates to devices designed for detecting metals and can be used in food and woodworking industry. The proposed metal detector contains an oscillator (1) and a transducer (3) with measuring coils that is connected to the output of the oscillator. When metal is detected, the tra...
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Zusammenfassung: | The present invention relates to devices designed for detecting metals and can be used in food and woodworking industry. The proposed metal detector contains an oscillator (1) and a transducer (3) with measuring coils that is connected to the output of the oscillator. When metal is detected, the transducer generates the output signal that is applied to the input of an amplifier (4). The output of the amplifier (4) is connected to the control input of a trigger (10) via switch (5), phase detectors (6, 7), an amplifier (8) with a filter, and a comparator (9). The difference between the parameters of the transducer coils, which is caused by temperature variations and other factors, is compensated by applying an in-phase signal and a quadrature signal to the corresponding inputs of the amplifier (4). To generate the said signals, multipliers (13, 14), integrators (15, 16) of the error signal, and a phasor (12) are used. The present invention provides the possibility to increase the sensitivity and simplify the circuit of the metal finder. |
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