| 摘要 |
The detector (1, 2, 3, 4) max sensitivity is oriented in different directions in the plane which includes the radiation source max radiation, whereby the detectors detect the diffusely reflected radiations from the source against a measurement surface. The detectors are positioned closely to each other and at a specific distance from the radiation source max radiation. The output signal from the system consists of the quota between weighted sum signals from two groups of detectors, with the summations made within the respective groups, and each group of detectors (2, 3; 1, 4) comprises one or more detectors whose max sensitivity is directed in the same direction. |
