Abstract

A simple device for the measurement of the color temperature of incandescent lamps is described. Two vacuum photo-tubes are used in a balanced bridge circuit with an “electric eye” as an output indicator. No electronic amplification is used.

© 1940 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. Campbell and Gardiner, “Photoelectric color matching,” J. Sci. Inst. 2, 12 (1925); J. Sci. Inst. 4, 38 (1926).
    [CrossRef]
  2. G. F. Hubing, “Portable photoelectric pyrometer,” J. Opt. Soc. Am. 26, p. 260 (1936).
    [CrossRef]
  3. Russell, Lucks, and Turnbull: “A new two-color optical pyrometer,” J. Opt. Soc. Am. 30, 248 (1940).
    [CrossRef]
  4. C. H. Sharp, “Apparatus for measuring the color temperature of incandescent lamp filaments,” J. Opt. Soc. Am. 20, 62 (1930).
    [CrossRef]

1940 (1)

1936 (1)

1930 (1)

1925 (1)

Campbell and Gardiner, “Photoelectric color matching,” J. Sci. Inst. 2, 12 (1925); J. Sci. Inst. 4, 38 (1926).
[CrossRef]

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (4)

Fig. 1
Fig. 1

Showing flux distribution at two temperatures. E1—Spectral distribution of a blackbody at a given temperature; E2—Same as E1 at a higher temperature; A B ¯— Range of response for an ideal blue receiver; C D ¯—Range of response for an ideal red receiver. Cross-hatched sections show the effective radiation for E1, cross-hatched areas plus dotted areas for E2.

Fig. 2
Fig. 2

Relative response of photo-cells. Curve 1—Relative response of type 926 photo-cell used as the blue receiver. Curve 2—Relative response of type 922 cell. Curve 3—Relative response of the filtered 922 cell used as the red receiver. Note: Since the absolute response corresponding to curve 1 is much less than that for curves 2 and 3, curve 1 cannot be directly compared with curves 2 and 3 as to relative response.

Fig. 3
Fig. 3

Electrical circuit. C1—40 mf; C2—0.005 mf; N 1 4-watt “resistorless” neon lamp; R1—5000 ohms, variable; R2—20,000 ohms; R3—1000 ohms; R4—20,000 ohms; R5—50,000 ohms; R6—40,000 ohms; R7—10,000 ohms; R8—0.5 megohm; R9—15 megohms; R10—360-ohm “line cord resistor.”

Equations (1)

Equations on this page are rendered with MathJax. Learn more.

I = k [ 0 ( E ) λ · ( P 1 ) λ · d λ - 0 ( E ) λ · ( P 2 ) λ · d λ ] ,