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An improved method for water vapor detection.

T Adams, M A Steinmetz, D B Manner

Annals of Biomedical Engineering

|January 1, 1983

Summary

A new device accurately measures low-level water evaporation rates using thermal conductivity. This noninvasive tool has applications in skin research and material science, offering precise measurements for various water diffusion studies.

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Area of Science:

Biomedical Engineering
Materials Science
Physical Chemistry

Background:

Accurate measurement of low-level water evaporation is crucial for understanding biological processes and material properties.
Existing methods may lack sensitivity, precision, or noninvasive capabilities for certain applications.

Purpose of the Study:

To describe the construction, calibration, and use of an improved device for measuring low-level water evaporation rates.
To validate the device's accuracy and sensitivity for various applications.

Main Methods:

Utilized a thermal conductivity cell for precise measurement of water evaporation (E) from small surface areas.
Developed a device providing analog d.c. voltage output and digital display for evaporation rate and total amount.
Ensured the device is noninvasive and constructed from conventional components.

Main Results:

Achieved measurement of water evaporation rates from 0.0 to 1.0 mg/min.
Demonstrated a high correlation coefficient (0.999) between measured and independently verified evaporation rates.
Confirmed the device's sensitivity and rapid response for thermoregulatory and psychogenic sweating.

Conclusions:

The improved thermal conductivity device offers accurate and precise measurement of low-level water evaporation.
The noninvasive, versatile device is suitable for biological applications (e.g., transcutaneous water diffusion, sweating) and material science (adsorption/desorption, water storage).
The device's design facilitates construction from conventional components, promoting accessibility.

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