Response calculations for five commercial light-scattering aerosol particle counters have been carried out that take into account the emissive power of the light source, the spectral sensitivity of the phototube, and the specific geometrical factors for each instrument. Earlier calculations had been published for two of these instruments, but these had not considered each of these factors appropriately. The results indicate a strong dependence of response upon both the real and imaginary part of the refractive index and, for a given refractive index, a multivalued response in the submicrometer range for three of the five instruments.
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This is the tungsten filament blackbody temperature. The emissive power was obtained from A. C. Hardy and F. H. Perrin, Principles of Optics (McGraw-Hill, New York, 1932), p 150,
where c1 = 3.703 × 1023 and c2 = 1.433 × 107.
This is the spectral sensitivity of the photosurface. The response for the S5 photocathode was found in J. W. Gewartowski and H. A. Watson, Principles of Electron Tubes (D. Van Nostrand, Princeton, N.J., 1965), p. 70. The response for the S4 surface was found in the RCA Tube Handbook, 1 August 1944.
Bausch & Lomb, 820 Linden Ave., Rochester, New York 14625. The angles used differ from those cited in earlier references, viz., 13.75°, 53.75°, 23.75°. These data were provided by D. D. Doonan of the Bausch & Lomb Company, personal communication, 27 June 1973.
Climet Instruments Company, 1240 Birchwood Dr., Sunnyvale, California 94086. The angles were measured from scale drawings provided by the company.
Royco Instruments Company, 141 Jefferson Dr., Menlo Park, California 94025.
Obtained from Donald Lash, General Electric Lamp Division, Cleveland, Ohio, for the GE 1014 coiled filament lamp rated for use at 6.6 V, but operated in this instrument at 6.0 V.
Obtained from operating data and specifications sheet supplied by E. G. and G. Inc., Electro-Optics Division 35, Congress St., Salem, Massachusetts 01970.
This temperature corresponds to a lamp voltage of 6.3 V. For the alternate voltage of 5.75 V, this GE 1014 lamp had a filament temperature of 2650 K. However, the resulting response curves were very similar.