No abstract

A high-stability, high-level (1.3-A) current source circuit of modest cost is described, suitable for powering lead-salt laser diodes or other semiconductor devices, especially expensive, delicate, or rare experimental samples requiring the protection features this current supply offers. The supply features circuits to shut off current to the laser or other device smoothly and quickly (in less than 90 μs) if there is an overvoltage, overcurrent, main battery supply failure, or elevated temperature condition, to protect the laser or device from any of these potentially damaging conditions. Spectral data of a lead-salt laser emitting in the 1840-cm−1 region are presented to demonstrate the use of the current supply.

An engineering design of an Jinager upgrade is under consideration for the GOES.N/Q seiies. The upgrade consists of adding up to three new JR channels at 4 km resolution and doubling the earth coverage rate. The design approach introdixes advancedtechnOlOaj as needed to minimize impacts to the sensor optical and mechanical configuration, eleclrcnicsbox layout, data cxnmunicaticn links and ground systns. By operating presently redundant portions of detector arrays and developing double rate signalprocessors, the scanning servo system and electronics modules are largely retaineL Bicolor detectors and optical coatings are used to add channels while retaining the present relay optics and radiant cooler layouts. Lossy data compression ofvisible imagery and lossless data compression ofiR imageiy are used to preserve the ssor data and processed data relay ocmmuthcaiicns links. SysteniNEDT and SNR performance and implementation issues for new technologies are addressed.

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