Gas absorption cell photometer for rocket observations of local interstellar helium
Abstract
A photometer sensitive in the 584-A line of He I, incorporating a helium-gas absorption cell, has been developed. The helium is confined at a pressure of 0.2 torr between thin-metal-foil broad-band ultraviolet filters. The cell contains sufficient helium to absorb 584-A radiation scattered from atmospheric helium. The ratio of fluxes seen with the cell full and empty provides a valuable datum for fitting models of the local interstellar medium, which is independent of solar 584-A flux, interstellar helium density, and photometer sensitivity.-
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- March 1976
- DOI:
- 10.1063/1.1134631
- Bibcode:
- 1976RScI...47..277F
- Keywords:
-
- Absorption Spectroscopy;
- Gas Spectroscopy;
- Helium;
- Interstellar Gas;
- Photometers;
- Rocket-Borne Instruments;
- Astronomical Photometry;
- Atmospheric Scattering;
- Calibrating;
- Photosensitivity;
- Spectrophotometry;
- 94.70.Km;
- 98.40.-p;
- Instrumentation and Photography