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Description
Michigan Scientific's FO-LS is an EMI hardened Fiber-Optic Light Monitor that provides a means to observe the presence or absence of light (digital operation) in a high field environment or anechoic chamber. The light monitor is usable with almost any visible or near infrared light source such as LED's, neon, fluorescent, incandescent bulbs, lasers and flame sources. Signals sent over optic fiber are immune to interference or signal impairment typically seen with wire cable. Benefits provided are small size in a self-powered transmitter having electromagnetic immunity and extended battery life.
The active sensor is a photo-conductive cell with a wide dynamic range, capable of response to both very low light levels (moonlight) and to very high light levels (direct sunlight). The resistance changes several orders of magnitude between 'light' and 'no light.' An external sensitivity adjustment w/status LED is provided to set the detector threshold.
The receiver accepts 4 transmitter inputs and demodulates each incoming signal back to the light state as originally detected. A green LED displays the light state on the front panel and a BNC connector provides the TTL output on the back panel.
The FO-LS transmitter is EMI hardened and validated for EMC in harsh RF environments at power levels up to 200 V/m (46 dBV/m) from 500 kHz to 2 GHz. The FO-LS system uses 820 nm wavelength multimode 62.5/125 µm, 100/140 µm or step-index 200 µm HCS fiber cables. SMA type 905 connectors are standard.