Noise considerations in millimeter-wave spectrometers
An improved version of a microwave spectrometer operating in the vicinity of 70 GHz is described. The spectrometer, which incorporates a Fabry-Perot resonator and superheterodyne detection for high sensitivity is designed for the detection of gaseous pollutants and other atmospheric constituents. The instrument is capable of detecting polar molecules with absorption coefficients as small as 2 x 10/sup -9/cm/sup -1/. For sulphur dioxide diluted in air, this sensitivity corresponds to a detection limit of 1.2 ppm without preconcentration and with a time constant of 1 second. Measurements and analysis of the noise contributions limiting the sentivity are presented.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6231691
- Report Number(s):
- LBL-7294
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sensitivity and response time improvements in a millimeter-wave spectrometer
Millimeter-wave spectrometer for pollution research
Sensitivity and response time improvements in millimeter-wave spectrometers
Journal Article
·
Tue Jun 01 00:00:00 EDT 1982
· Rev. Sci. Instrum.; (United States)
·
OSTI ID:5505805
Millimeter-wave spectrometer for pollution research
Technical Report
·
Mon Feb 14 23:00:00 EST 1977
·
OSTI ID:6852478
Sensitivity and response time improvements in millimeter-wave spectrometers
Technical Report
·
Mon Sep 01 00:00:00 EDT 1980
·
OSTI ID:6603463