基本信息
摘要：780,089. Photo-electric gauging apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 15, 1955 [Jan. 26, 1955], No. 2305/55. Class 40 (3). [Also in Group XXXVI] An instrument for gauging a dimension comprises separable members between which the specimen is received and a semi-conductor rectifying photo-junction across which a voltage is applied and which has a light pattern directed close to the junction, the arrangement being that the distance of the pattern from the junction varies with that of the dimension to be gauged so as to indicate the dimension on an electric current meter. As shown, the object to. be gauged is inserted between an anvil 3 and a ball-ended probe 4. Probe 4 is carried by flat springs 6, 7 and carries a block 11 of insulating material in which are mounted a pair of semi-conductor rectifying photo-junction of germanium P-N type. Fig. 2 shows the two junctions. An adjustable tube 19 carried on telescopic legs 17, 18 and containing lenses, a rotatable diaphragm and a light source directs a line of light 6 on the semiconductors so as to fall to one side of one interface in one case and the other side in the other. The connections are shown in Fig. 3, the semiconductors being arranged to form with potentiometer 30 a bridge circuit across which D.C. is applied from source 29. A current meter 31 is connected across the common cell connection and the potentiometer slider and is shunted at 33, 34 for adjustment. Fig. 4 shows an arrangement in which a pair of semi-conductors of P-N-P type have a wafer W of N type material on which are spots 15
摘要附图：
