Light measuring apparatus

Abstract

Abstract PURPOSE:To enable highly accurate measurement at all times by incorporating a temperature sensor and storing the temperature characteristic of a photosensor in a memory, so that the temperature is compensated within the measuring temperature range. CONSTITUTION:An operational amplifier OP1 changes a photocurrent IPX of a photosensor 4X to a voltage and outputs the voltage, while an operational amplifier OP2 changes an output current from a temperature sensor 10 to a voltage and outputs the voltage. A CPU 13 carries out temperature correction to the measuring data from the measuring data and temperature data supplied from analog-digital converters (ADC) 11, 12, and temperature characteristic data of the photosensor 4X stored beforehand by a memory 14. The measuring value after being corrected is indicated by an indicating part 15. Accordingly, since the temperature characteristic of the photosensor 4X is stored by the memory 14 and utilized for temperature correction, even if the inclination of the characteristic is changed in accordance with the temperature, the temperature is corrected in consideration of this change, thereby effecting highly accurate measurement at all times.

Inventors

• 👤 Shizuhiro Okui
• 👤 奥井　静弘
• 👤 Kazuhiko Naruse
• 👤 鳴瀬　一彦
• 👤 Taketoshi Kawamura
• 👤 河村　武敏
• 👤 Shinji Shimizu
• 👤 晋二 清水
• 👤 Mikio Uematsu
• 👤 幹夫 上松

Bibliographic Details