| 摘要 |
Scanning radiation source detecting apparatus, comprising means for deriving a general response signal in response to radiation from any part of a field of view, and a central response signal in response to radiation from a central part of the field of view, with means for producing audio signals of a frequency dependent on the magnitude of the central response signal. The apparatus may produce a constant frequency signal in response to the general response signal, and the central response signal may be derived from the general response by a gate circuit controlled by a scanning mirror mechanism. The gate circuit may be connected to a voltage controlled oscillator by a sample-and-hold circuit or, by an integrating circuit. Alternatively the apparatus may comprise a light emitting diode energized by a radiation detector, an optical system arranged to form an image of the diode and two separate detectors placed in the optical system to form the general response and central response signals. One detector covers a small area at the center of the image plane; the other covers a larger area in a different plane, and intercepts only some of the rays directed to extreme positions on the image plane.
|
