| |
 |
| Paper: |
A synchronous motor chopper for laboratory testing of detector systems in infrared astronomy |
| Volume: |
73, Airborne Astronomy Symposium on the Galactic Ecosystem: From Gas to Stars to Dust |
| Page: |
579 |
| Authors: |
Baltz, James A.; Erickson, Edwin F. |
| Abstract: |
Airborne and ground-based IR telescopes have oscillating secondary mirrors to permit subtraction of background emission from the sky and telescope. These chopping mirrors are synchronized to a clock which may originate in the data acquisition system. For laboratory testing of detecting instruments with such data systems, externally synchronized chopped IR sources are required. We describe a laboratory chopper in which a synchronous motor is driven by 2-phase sinusoidal currents in sync with an external clock at frequencies from 5 to 50 Hz. This design is used with the KAO's facility sources, the Chopped Hotplate and the Portable Chopped Light Source (PCLS). |
|
|
|
|
|
