Measuring circuit for amount of light

Abstract

Abstract PURPOSE:To enable to display the relation of two types of light flux, by operating the integration value of the first and second integration circuits which perform photo electric conversion and integration for the first and second light flux with various methods. CONSTITUTION:The first integration circuit consists of the photo electric element Pd1 receiving the first flux alpha, amplifier A1 and capacitor C1, and the second integration circuit is made up of the photo electric element Pd2 receiving the second flux beta, amplifier A2 and capacitor C2, and the control circuit CONT controls the integration control switches S1 and S2 and gates G1 and G2 to specify the integration period of each integration circuit. The output of each integration circuit is fed to the operation circuit Ar via the counters T1 and T2, and the result of the number of counts of the counter T2 divided by the number of counts of the counter T1 is calculated and displayed on the display unit DISP.

Inventors

• 👤 Azusa Ogawa
• 👤 Kazuo Sano

Bibliographic Details