| 摘要 |
A meter sensor light tamper detector includes at least one light emitter and one or more sensors. The sensors have some parameter, i.e., conductivity in the case of phototransistor sensors, to provide an indication that they are in the presence of light. The system also includes a microprocessor which is capable of independent control of the light emitter and the sensors, and can determine the state of the electrical parameter, i.e., conductivity or nonconductivity, of the sensors. The microprocessor determines whether the sensors are being tampered with by checking the state of the sensors when a particular light condition is known to be present or absent.
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