MID-IR detection: Detector circuitry and noise

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Our ability to measure the spectral transmission of the atmosphere is limited in two ways. First, by noise that is added to the returning signal by random processes such as electronic noise and the random emission of IR photons. Second, by speckle that acts as a wavelength dependent multiplier of the returning signal amplitude. In this paper we report our estimates of the effects of added random noise on the measurements planned for the October field tests. We do not consider speckle which is fundamentally different from {open_quotes}additive noise{close_quotes} and is being separately considered by others. The system which will ... continued below

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14 p.

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Blum, A.; Gates, A. & Montoya, M. July 1, 1994.

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Our ability to measure the spectral transmission of the atmosphere is limited in two ways. First, by noise that is added to the returning signal by random processes such as electronic noise and the random emission of IR photons. Second, by speckle that acts as a wavelength dependent multiplier of the returning signal amplitude. In this paper we report our estimates of the effects of added random noise on the measurements planned for the October field tests. We do not consider speckle which is fundamentally different from {open_quotes}additive noise{close_quotes} and is being separately considered by others. The system which will be fielded by LLNL in October `94 will transmit on and off resonance wave-lengths {lambda}1 and {lambda}2. The integral of the returning signal as well as an integral of the transmitted signal will be recorded at each wavelength. From these the transmission can be calculated. The two returning wavelengths are separated in a spectrograph and sent to detectors in a 16-element array. Each detector is followed by an amplifier. To maintain good system linearity, nominally constant detector voltage, and large dynamic range, it is desirable that the amplifier input be a virtual ground. Either a linear transimpedance amplifier or negative feedback charge sensitive can satisfy this requirement. Two of the 16 amplifier outputs are selected by a multiplexer and passed to data processing and/or recording hardware. The charge sensitive amplifier integrates the arriving current and we need only record its output. The digital sampling (waveform capture) hardware can be used in a mode in which it records the integrated outputs.

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14 p.

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OSTI as DE95014159

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  • 1994 chemical analysis by laser interrogation of proliferation effluents (CALIOPE ITR) interim technical review, Livermore, CA (United States), 26-28 Apr 1994

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  • Other: DE95014159
  • Report No.: UCRL-JC--118290
  • Report No.: CONF-9404162--21
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 82393
  • Archival Resource Key: ark:/67531/metadc785035

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  • July 1, 1994

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  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 17, 2016, 2:27 p.m.

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Blum, A.; Gates, A. & Montoya, M. MID-IR detection: Detector circuitry and noise, article, July 1, 1994; California. (digital.library.unt.edu/ark:/67531/metadc785035/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.