Narrowband ultraviolet vapor filter.
A narrowband optical vapor filter based on the principle of selective specular reflection from vapors is described. The device consists of a mercury vapor cell with Brewster angle windows that selectively reflects the 2537-A line and transmits other radiation. The bandwidth of the device varies from 0.1 A to 1.0 A as a function of the mercury vapor pressure. Its signal-to-skirt rejection ratio at an acceptance angle of 7 degrees is 28 dB, and its acceptance area is 1 cm(2). It is used to perform a spectrochemical analysis of mercury in water and also to take a monochromatic photograph of the spatial distribution of excited mercury atoms in a flame.
B
B
Senitzky