公开(公告)号：US3684378A

公开(公告)日：1972-08-15

申请号：US3684378D

申请日：1970-09-04

Applicant: JOSEPH S LORD

Inventor： LORD JOSEPH S

IPC: G01J1/16 ,  G01J1/36 ,  H03F1/30 ,  G01J3/42

CPC classification number: G01J1/16 ,  G01J1/36 ,  H03F1/303

Abstract: In a flicker-type photosensing device, photosensor dark current is corrected for by applying the output of the photosensor to a current-to-voltage mode amplifier including a special dark current correction loop. In particular, the amplifier has connected between its input and output terminals a loop including a resistor, a grounded capacitor, a gating arrangement adapted to close the loop only during those periods when no light beam is applied to the photosensor, and a second resistor for limiting the capacitor charging rate. In operation, the capacitor charges while the gate is closed during the dark period; and, during pulse periods when the gate is open, it discharges to reduce the photosensor current by an amount nearly equal to the dark current.

Abstract translation: 在闪烁型感光装置中，通过将光传感器的输出施加到包括特殊暗电流校正环的电流 - 电压模式放大器来校正光电传感器暗电流。 特别地，放大器已经在其输入和输出端之间连接一个环路，该环路包括电阻器，接地电容器，仅在没有光束施加到光电传感器的那些周期期间闭合环路的选通装置，以及第二电阻器 限制电容充电率。 在操作中，在黑暗期间门关闭时，电容器充电; 并且在栅极断开的脉冲周期期间，其放电以将光电传感器电流减小几乎等于暗电流的量。