Krypton hygrometer

From Glossary of Meteorology
A hygrometer technically very similar to the Lyman-alpha hygrometer, but with the hydrogen radiation source replaced by a Krypton glow tube.

The main emission is at 123.58 nm, and the main advantages are a longer lifetime of the Krypton tube and a better calibration stability compared to the Lyman-alpha hygrometer, which makes this instrument more suitable for continuous humidity recordings. On the other hand, the sensitivity of the Krypton hygrometer is distinctly lower; therefore it is used mainly for ground- based measurements.

A hygrometer technically very similar to the Lyman-alpha hygrometer, but with the hydrogen radiation source replaced by a Krypton glow tube.

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