| 摘要 |
Range finding equipment for use with optical systems utilizing a small number of radiation detectors positioned to receive radiation in first and second patterns from a remote object. The logarithm of the ratio of the output of a first and second detector are compared with the logarithm of the ratio of the output of a third and fourth detector to determine which has the largest absolute magnitude. The system operates to control the range finding circuitry with the largest signal thus obtained.
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