| 摘要 |
<p>An instrument including a light-emitter (24) of a light beam, a sensing head (14) through which the light beam is transmitted, a light-detective element (30) receiving the beam from the head (14)and a detector receiving an electric signal from the light-detective element. The head (14) has a thermo-optical element (12) changing a first component of the light beam with an ambient temperature, and an optical element (10) changing a second component of the beam with an electric quantity. The electric signal produced by the light-detective element has a first and a second component which correspond to the first and second components of the light beam, respectively. The detector determines the ambient temperature based on the first component of the electric signal, and determines the electric quantity based on the second component of the electric signal. The electric quantity may be an AC magnetic field, a current, an AC electric field or a voltage.</p> |
