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  1. R. C. Hawes, Appl. Opt. 10, 1246 (1971).
    [CrossRef] [PubMed]
  2. A. Reule, Appl. Opt. 7, 1023 (1968).
    [CrossRef] [PubMed]
  3. ASTM, Standard Test Methods for Normal Spectral Emittance at Elevated Temperatures, E307-72 (ASTM, Philadelphia, 1972), Part 41.
  4. J. E. Stewart, Infrared Spectroscopy, Experimental Methods and Techniques (Marcel Dekker, New York, 1970).
  5. In first approximation, the electrical equivalent circuit of a thermopile exposed to a chopped light [light duty cycle d = ton/(ton + toff)] is a parallel RC circuit driven by a pulsed current with the same duty cycle (d = t0/T). The ripple can be defined as r = ΔV/〈V〉, where 〈V〉 = iRd is the average voltage stationary value, while ΔV = 〈V〉Δt/RC is the peak-to-peak voltage value being Δt = T − t0 = (1 − d)T, the discharge time.

1971

1968

Hawes, R. C.

Reule, A.

Stewart, J. E.

J. E. Stewart, Infrared Spectroscopy, Experimental Methods and Techniques (Marcel Dekker, New York, 1970).

Appl. Opt.

Other

ASTM, Standard Test Methods for Normal Spectral Emittance at Elevated Temperatures, E307-72 (ASTM, Philadelphia, 1972), Part 41.

J. E. Stewart, Infrared Spectroscopy, Experimental Methods and Techniques (Marcel Dekker, New York, 1970).

In first approximation, the electrical equivalent circuit of a thermopile exposed to a chopped light [light duty cycle d = ton/(ton + toff)] is a parallel RC circuit driven by a pulsed current with the same duty cycle (d = t0/T). The ripple can be defined as r = ΔV/〈V〉, where 〈V〉 = iRd is the average voltage stationary value, while ΔV = 〈V〉Δt/RC is the peak-to-peak voltage value being Δt = T − t0 = (1 − d)T, the discharge time.

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Figures (2)

Fig. 1
Fig. 1

Sector disk attenuator apparatus: (a) dc motor container; (b) frequency monitor.

Fig. 2
Fig. 2

Frequency spectrum analysis performed to choose the best rotation condition for the 50% sector disk attenuator: (a), (b), (c), (d) noise output at 122, 127, 132, 133 Hz; (e) what comes out without using any disk; (f), (g), (h) allowed rotation frequencies at 116, 150, 183 Hz.

Tables (2)

Tables Icon

Table I Sector Disk Attenuator Characteristics

Tables Icon

Table II Test Results. Average Transmission, Standard Error and Density Values for Two Neutral Density Filters Measured Separately and Coupled (Seventeen Experimental Points from 8400 to 4800 cm−1)

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