405M6
Model 405M6
High Gain Thermally pensated
Pyroelectric IR Detector
Manufactured under one or more of the following U.S. patents: 3,839,640
- 4,218,620
- 4,326,663
- 4,384,207
- 4,437,003
- 4,441,023
- 4,523,095
Model 405M6 consists of two lithium tantalate sensing elements, a load resistor and a JFET sealed into a TO-5 transistor package with an optical filter.
One centrally located sensing element is exposed to infrared radiation entering through the optical filter while the second element is shielded from outside radiation.
The sensing elements are connected electrically in a parallel opposed configuration for cancellation of signals generated by both crystals due to thermal changes in the housing environment.
The JFET circuit is configured to provide gain (about 5x with a 100k Ω source resistor) whereas the standard source follower circuit has a gain less than one.
A source resistor is required to set the drain current and the operating parameters of the JFET. A 100k Ω to 1 M Ω...
