Signal correction circuit for infrared camera

Abstract

Abstract PURPOSE:To obtain a stable output signal, by including a cooling means, a temperature detection means of detecting the temperature thereof, a comparison means for picking up errors from a reference voltage means, an automatic gain control means and the like to supperess variations in the output with changes in the cooling temperature. CONSTITUTION:In a container 2, for example, Peltier elements 3a-3c are placed on a container base 2a and terminals T3 and T4 are used as current supply terminal. An infrared detection element 5 and a temperature sensor 6 are arranged on an element 3a and detection outputs are led out through terminals T5 and T6 while the temperature sensor outputs done through terminals T1 and T2. With such an arrangement, the output Vc+ or -DELTAVc corresponding to the temperature error is amplified to be obtained at an output terminal of a differential amplifier U1 and is applied to a current amplifier U2. The control current as such converted with the amplifier U2 is applied to elements 3a-3c to control them to a specified temperature. On the other hand, the detection output is applied to an automatic gain control amplifier U3 and the output Vc+ or -DELTAVc of the differential amplifier U1 is applied to a gain control terminal to control an electric circuit system with a relatively quick response to perform a second temperature correction whereby a control output is led out to a terminal Tout.

Inventors

• 👤 Masaaki Nakamura
• 👤 正昭 中村
• 👤 Yukihiro Yoshida
• 👤 幸広 吉田

Bibliographic Details