Characterization of Humidity Sensors and Physical Properties of H20.

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Abstract:

Commercially available humidity sensors have been evaluated. There do not appear to have been any significant advances in aluminum oxide devices recently. A new sensor Thunder Scientific BR-101B is a little faster than the aluminum oxide types but not as fast as the manufacturer claims, and it has the significant advantage of a near purely resistive impedance. A monitoring system capable of following fast changes milliseconds in sensor parameters has been developed it detects and records in logarithmic fashion both the magnitude and phase of th sensors response to a sinusoidal signal. Thermal conductivity of pure ice Ih and tetrahydrofuran hydrate has been measured in the temperature range 45 to 200K. The data on the pure ice is in good agreement with previous results. Our data on the clathrate hydrate is a little higher than previous measurements by a radial flow method, but we also find the conductivity to be a factor of 5 at 200K to 20 at 45K lower than that of pure ice. We find an identical temperature dependence to that found previously, and we extended measurements down to 45K. Author

Author(s):
Ashworth, T.
Author Organization(s):
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DEPT OF PHYSICS
Descriptive Note:
Final rept. Jan 82-Aug 83,
Pagination:
0046

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PHYS-84-1
Contract/Grant Number(s):
N00014-75-C-0214, N00014-82-K-0177
 Subject Terms
Communities of Interest:
Sensors
Descriptor(s):
*Hygrometers, *Water, *Physical properties, *Thermal conductivity, Water vapor, Ice, Monitoring, Aluminum oxides, Clathrate compounds, Hydrates, Radial flow, Temperature, Furans, Hydroxyl radicals
Field(s)/Group(s):
Meteorology, Test Facilities, Equipment and Methods, Thermodynamics
Report Date:
1984 Mar 01