Detection and Signal Processing: Technical Realization by Wilhelmus Jacobus Witteman

By Wilhelmus Jacobus Witteman

This entire monograph offers with detectors, sign processors and similar noise phenomena. precise quantitative analyses are constructed in a constant structure for thermal detectors, vacuum detectors, semiconductor detectors and avalanche detectors, in addition to their accompanying noise currents. For sign processing applocations, the monograph treats intimately the operational amplifier, sign averagers, waveform analyzers, correlation ideas and heterodyne detection. numerous unique extensions are stated, specially for correlation units and heterodyne detection with noise rejection. furthermore, result of analyses are illustrated with examples of working platforms and of purposes in house communique and laser radar.

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Extra info for Detection and Signal Processing: Technical Realization

Sample text

We find ∆P 2 = 16ABσkT 5 . 68) over the full spectrum. 47) and integrating over ν. 86) where we have substituted σ = 2π 5 k 4 /15c2 h3 . 84). This can be understood by the fact that we have considered so far only the incident radiation. 84). 2 Signal–Noise Relations The noise signals as discussed in Chap. 1 are always inherently connected to the detection process or they are a consequence of the physical nature of the input signal itself. In fact the noise pollutes the signal and a low-power signal may be even obscured by the noise.

The ultimate minimum of the thermal conductance is set by radiation losses only. It is therefore challenging to reduce the conduction losses along the leads as far as possible and to get it at most comparable with the radiation losses. Leads as thin as 100 µm have been used. 20). Unfortunately these requirements for thermal and electrical conductivity are not compatible, because according to the Wiedemann-Franz law it is stated that metals with low thermal conductivity have also low electrical conductivity.

29). For the operating current i0 the voltage V0 is indicated. The resistance of the element is R = V /i but its deviation from the derivative Z = dV /di contains information on λ and α. As a consequence the responsivity can be described by the voltage–current curve. For this purpose we describe dV /di in 1/2 and terms of the dissipated electrical power P by substituting V = (P R) 1/2 i = (P/R) . We write −1/2 Z= 1/2 (P R) dV = −1/2 di 1/2 P R R dP dR + P 1 dP R dR − P R2 dP dR = R dP dR + − P R P R .

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