Temperature control apparatus for controlling metallic vapor pre

Details Temperature control apparatus for controlling metallic vapor pre Temperature control apparatus for controlling metallic vapor pre

1990-01-25

1992-01-21

Ben, Loha

Optical: systems and elements

Absorption filter

Fluid

250436, 250343, 250352, 250429, 356 43, 359896, G02B 500

Patent

active

050823566

ABSTRACT:
By controlling the temperature of a glass reservoir tube attached to a closed vapor cell, the vapor pressure inside the cell can be accurately controlled. The apparatus for controlling the reservoir temperature includes an electric heater, a temperature sensor, heat straps to distribute and remove heat from the reservoir, and a clamp to hold the apparatus in close thermal contact with the exterior of the reservoir. An external control circuit energizes the reservoir heater as required. In the preferred embodiment the vapor cell functions as an optical filter when filled with a heated metallic vapor such as cesium. The reservoir tube functions as the cold spot of the cell and contains a small pool of the metal in liquid form.

REFERENCES:
patent: 4452538 (1984-06-01), Reger et al.
patent: 4749276 (1988-06-01), Bragg et al.
patent: 4789784 (1988-12-01), Grossman
patent: 4935633 (1990-06-01), Curbelo et al.

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