A hygrometer based on measuring the speed of sound and the temperature

Pekka Hiismäki, Veikko Kämäräinen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Humidity can be calculated by measuring the speed of sound and the temperature in air. A new type of hygrometer has been constructed for industrial applications and therefore special attention has been paid to easy maintenance. The measurement of the speed of sound is effected in a steel pipe through which the air can flow freely. A 2-22 kHz wide-band frequency sweep is used as the sound signal, the transit time of which is measured with a fast fully parallel polarity correlator. The temperature measurement method is aimed at giving the real mean temperature of the air in the steel pipe. The use of a multiplexer enables the measurement of humidity at several places simultaneously. The results obtained in a test chamber have shown that good accuracy can be achieved with the hygrometer.
Original languageEnglish
Pages (from-to)1465-1468
JournalJournal of Physics E: Scientific Instruments
Volume20
Issue number12
DOIs
Publication statusPublished - 1987
MoE publication typeA1 Journal article-refereed

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Hygrometers
hygrometers
Acoustic wave velocity
Humidity
Steel pipe
acoustics
humidity
air
Steel
Atmospheric humidity
Air
steels
test chambers
sweep frequency
Correlators
Temperature Measurement
Correlator
Polarity
transit time
Sweep

Cite this

Hiismäki, Pekka ; Kämäräinen, Veikko. / A hygrometer based on measuring the speed of sound and the temperature. In: Journal of Physics E: Scientific Instruments. 1987 ; Vol. 20, No. 12. pp. 1465-1468.
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A hygrometer based on measuring the speed of sound and the temperature. / Hiismäki, Pekka; Kämäräinen, Veikko.

In: Journal of Physics E: Scientific Instruments, Vol. 20, No. 12, 1987, p. 1465-1468.

Research output: Contribution to journalArticleScientificpeer-review

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