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A Simple Psychrometric Apparatus for Bowen Ratio Determinations

D. H. SargeantUniversity of Wisconsin, Madison

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C. B. TannerUniversity of Wisconsin, Madison

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Abstract

A simple apparatus has been devised which automatically reverses the vertical positions of two pairs of shielded and aspirated wet- and dry-bulb diodes. Analog voltage signals proportional to the dry and wet bulb temperatures T and Tw and to the differences ΔT and ΔTw are provided. The diodes present a low source impedance, a linear response over normal ranges, a sensitivity of about 2.3 mV(°C)−1, and as used here, a time constant of about one minute. From these measurements the Bowen ratio can be determined conveniently.

Abstract

A simple apparatus has been devised which automatically reverses the vertical positions of two pairs of shielded and aspirated wet- and dry-bulb diodes. Analog voltage signals proportional to the dry and wet bulb temperatures T and Tw and to the differences ΔT and ΔTw are provided. The diodes present a low source impedance, a linear response over normal ranges, a sensitivity of about 2.3 mV(°C)−1, and as used here, a time constant of about one minute. From these measurements the Bowen ratio can be determined conveniently.

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