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Another Torsion Photoelectric Magnetometer |
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Vlk, M. |
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Institute of Geophysics of the CAS, Prague, Czech Republic |
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For proving of functionality of integral sensor – heating system unit, realization of which is being in progress at Polom observatory, simple TPM was constructed. Optical source is laser diode. Optical transducer works in baseband. It is realized with antiparallel PIN photodiodes and FET preamplifier of Kudelski type. Current output is fed to electronic box to regulator amplifier of Akerberg-Mossberg topology, which serves as TransImpedance Amplifier, integrator, damper and output amplifier. Feedback is realized by one-turn of Calibration Coil of the Bobrov element. Gain of the system (V/nT) is given by series resistor between TIA and CC. Heating is realized as continuous regulation via Phase to Amplitude Conversion property of switched H-bridge. |
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Instrumentation |
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oral |