Abstract

A recording night sky photometer which surveys the sky in 3 min 53 sec and possesses high spectral purity has been constructed and is in use at Sacramento Peak, New Mexico. The photometer is used to record the night sky emission lines at 5577, 5890, and 6300 A. It employs three interference filters 6 inches in diameter, of about 15 A band width, of about 70% transmission, and centered upon the above emission lines. It also employs a single element quartz birefringent filter used to modulate the emission lines. This arrangement of filters was first employed by Blamont and Kastler [ Ann. géophys. 7, 73 ( 1951)] and has been effectively used by Koomen et al. [ Koomen, Lock, Packer, Scolnik, and Tousey, J. Opt. Soc. Am. 44, 827 ( 1954)]. The ac signal in the photomultiplier is then proportional to the emission intensity. This combination of filters provides high spectral purity and corresponding freedom from the effects of continuum in the vicinity of the emission lines.

© 1956 Optical Society of America

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References

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  1. F. E. Roach and Helen B. Pettit, J. Geophys. Research 56, 325 (1951).
    [Crossref]
  2. John W. Evans, J. Opt. Soc. Am. 39, 229 (1949).
    [Crossref]
  3. Bernard Lyot, Ann. Astrophys. 7, 31 (1944).
  4. Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
    [Crossref]
  5. Henry L. Cox, Rev. Sci. Instr. 24, 307 (1953).
    [Crossref]
  6. Edward R. Manring and Helen B. Pettit, “Observations of the [OI] 5577 nightglow at Sacramento Peak, New Mexico, February through June, 1955,” Airglow and Auroral Conference, Belfast, North Ireland, September, 1955 (The Pergamon Press Ltd., London, to be published).

1953 (1)

Henry L. Cox, Rev. Sci. Instr. 24, 307 (1953).
[Crossref]

1951 (2)

Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
[Crossref]

F. E. Roach and Helen B. Pettit, J. Geophys. Research 56, 325 (1951).
[Crossref]

1949 (1)

1944 (1)

Bernard Lyot, Ann. Astrophys. 7, 31 (1944).

Billings,

Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
[Crossref]

Cox, Henry L.

Henry L. Cox, Rev. Sci. Instr. 24, 307 (1953).
[Crossref]

Draisen,

Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
[Crossref]

Evans, John W.

Lyot, Bernard

Bernard Lyot, Ann. Astrophys. 7, 31 (1944).

Manring, Edward R.

Edward R. Manring and Helen B. Pettit, “Observations of the [OI] 5577 nightglow at Sacramento Peak, New Mexico, February through June, 1955,” Airglow and Auroral Conference, Belfast, North Ireland, September, 1955 (The Pergamon Press Ltd., London, to be published).

Pettit, Helen B.

F. E. Roach and Helen B. Pettit, J. Geophys. Research 56, 325 (1951).
[Crossref]

Edward R. Manring and Helen B. Pettit, “Observations of the [OI] 5577 nightglow at Sacramento Peak, New Mexico, February through June, 1955,” Airglow and Auroral Conference, Belfast, North Ireland, September, 1955 (The Pergamon Press Ltd., London, to be published).

Roach, F. E.

F. E. Roach and Helen B. Pettit, J. Geophys. Research 56, 325 (1951).
[Crossref]

Sage,

Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
[Crossref]

Ann. Astrophys. (1)

Bernard Lyot, Ann. Astrophys. 7, 31 (1944).

J. Geophys. Research (1)

F. E. Roach and Helen B. Pettit, J. Geophys. Research 56, 325 (1951).
[Crossref]

J. Opt. Soc. Am. (1)

Rev. Sci. Instr. (2)

Billings, Sage, and Draisen, Rev. Sci. Instr. 22, 1009 (1951).
[Crossref]

Henry L. Cox, Rev. Sci. Instr. 24, 307 (1953).
[Crossref]

Other (1)

Edward R. Manring and Helen B. Pettit, “Observations of the [OI] 5577 nightglow at Sacramento Peak, New Mexico, February through June, 1955,” Airglow and Auroral Conference, Belfast, North Ireland, September, 1955 (The Pergamon Press Ltd., London, to be published).

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Figures (7)

Fig. 1
Fig. 1

Over-all schematic diagram.

Fig. 2
Fig. 2

Orientation of birefringent components.

Fig. 3
Fig. 3

Transmissions of the interference and birefringent filter combination. The upper block shows the relative intensities of the two components of the sodium D lines. The second block shows the transmission vs wavelength curve of the interference filter used for the sodium D lines. The third block shows the transmission vs wavelength curves of the birefringent filter for 3 Polaroid positions. The final block is a transmission vs wavelength curve of the combined filters for one Polaroid position. The envelope is that of the interference filter.

Fig. 4
Fig. 4

Temperature controlled mounting jacket for birefringent elements.

Fig. 5
Fig. 5

Complete photometer.

Fig. 6
Fig. 6

Photometer showing interference filters.

Fig. 7
Fig. 7

Typical recording trace.

Equations (2)

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sin 2 i = ( W ω / 2.5 λ ) ,
( / - ω ) 1 2 ,