Procedures are described for simplifying the computation of detector responsivity (output per unit input) from known detector calibration data. These procedures involve the computation, tabulation, and use of certain dimensionless spectral matching factor ratios. These ratios effectively express the relative degree of overlap occurring between the spectral response distribution of the detector and the spectral distribution of the incident flux to be detected. All three basic systems of units for expressing detector responsivity (A/W, A/lm, and electrons/photon) are considered.
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Entry valid only for 300–1200-nm wavelength interval.
For the total wavelength spectrum this entry would be3 0.0294.
Notes:
Registered22 spectral distribution. Data extrapolated as required.
Sulfide type.
RCA23 data.
Low brightness22 type.
Harshaw Chemical Co. data.24
Standard test lamp distribution. See text and Table VIII.
From Davis et al.15 between 380 nm and 780 nm. From 300 nm to 380 nm and from 780 nm to 1200 nm at 2854°K blackbody spectral distribution was assumed.
General Electric Co. data.25
From Handbook of Geophysics.26
Approximately noon sealevel flux at 60° latitude.
From Gates27 between 300 nm and 530 nm. A 12,000°K blackbody spectral distribution was assumed between 530 nm and 1200 nm.
Registered spectral distribution.4 Data extrapolated as required.
Standard tabulated5 photopic visibility distribution.
Standard tabulated5 scotopic visibility distribution.
Weston Instrument Co. Photronic cell28 detectors.
Conversion factor for flux in watts to flux in photons/sec. See text.
Table II
Typical Peak and Integral Spectral Efficiency of Aluminized Phosphor Screens
Wavelength for peak spectral efficiency in radiated (W/nm)/phosphor-absorbed W.
Wavelength for peak spectral efficiency in (photons/nm)/phosphor-absorbed eV beam energy.
For 8-kV phosphor-absorbed electron beam energy, e.g., 10-kV electron beam energy with 2-kV loss in the aluminizing layer.
Table III
Peak Monochromatic and Integral Responsivity of Typical Photocathodes
Wavelength for peak monochromatic responsivity in A/W.
Wavelength for peak monochromatic responsivity in electrons/photon.
For secondary peak in the ir.
Table IV
Change in Luminous Responsivity with Flux Source RL/RL (cal) (2870°K calibrating lampa)
Entry valid only for 300–1200-nm wavelength interval.
For the total wavelength spectrum this entry would be3 0.0294.
Notes:
Registered22 spectral distribution. Data extrapolated as required.
Sulfide type.
RCA23 data.
Low brightness22 type.
Harshaw Chemical Co. data.24
Standard test lamp distribution. See text and Table VIII.
From Davis et al.15 between 380 nm and 780 nm. From 300 nm to 380 nm and from 780 nm to 1200 nm at 2854°K blackbody spectral distribution was assumed.
General Electric Co. data.25
From Handbook of Geophysics.26
Approximately noon sealevel flux at 60° latitude.
From Gates27 between 300 nm and 530 nm. A 12,000°K blackbody spectral distribution was assumed between 530 nm and 1200 nm.
Registered spectral distribution.4 Data extrapolated as required.
Standard tabulated5 photopic visibility distribution.
Standard tabulated5 scotopic visibility distribution.
Weston Instrument Co. Photronic cell28 detectors.
Conversion factor for flux in watts to flux in photons/sec. See text.
Table II
Typical Peak and Integral Spectral Efficiency of Aluminized Phosphor Screens
Wavelength for peak spectral efficiency in radiated (W/nm)/phosphor-absorbed W.
Wavelength for peak spectral efficiency in (photons/nm)/phosphor-absorbed eV beam energy.
For 8-kV phosphor-absorbed electron beam energy, e.g., 10-kV electron beam energy with 2-kV loss in the aluminizing layer.
Table III
Peak Monochromatic and Integral Responsivity of Typical Photocathodes
Wavelength for peak monochromatic responsivity in A/W.
Wavelength for peak monochromatic responsivity in electrons/photon.
For secondary peak in the ir.
Table IV
Change in Luminous Responsivity with Flux Source RL/RL (cal) (2870°K calibrating lampa)