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Transfer Calibration Validation Tests on a Heat Flux Sensor in the 51 mm High-Temperature Blackbody

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ABSTRACT

Facilities and techniques to characterize heat flux sensors are under development at the National Institute of Standards and Technology. As a part of this effort, a large aperture high-temperature blackbody was commissioned recently. The graphite tube blackbody, heated electrically, has a cavity diameter of 51 mm and can operate up to a maximum temperature of 2773 K. A closed-loop cooling system using a water-to-water heat exchanger cools electrodes and the outer reflecting shield. This paper describes the newly developed blackbody facility and the validation tests conducted using a reference standard Schmidt-Boelter heat flux sensor. The transfer calibration results obtained on the Schmidt-Boelter sensor agreed with the previous data within the experimental uncertainty limits.

No MeSH data available.


Angular response of the Schmidt-Boelter sensor measured in the 25 mm VTBB.
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f7-j65mur: Angular response of the Schmidt-Boelter sensor measured in the 25 mm VTBB.

Mentions: The cosine response of the heat flux sensor used in the present calibration was measured in the 25 mm VTBB. The measurements were made for different orientations of the sensor with respect to the radiant source operating at a fixed temperature of 2673 K giving a normal incident flux of 7 kW/m2 at the sensor surface. Measurement results along with the theoretical cosine response curve are presented in Fig. 7. The sensor output measurements for different angles have been normalized with respect to the value at the normal incidence (0°). Good agreement between the measurements and the theoretical response is observed, as expected.


Transfer Calibration Validation Tests on a Heat Flux Sensor in the 51 mm High-Temperature Blackbody
Angular response of the Schmidt-Boelter sensor measured in the 25 mm VTBB.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4862819&req=5

f7-j65mur: Angular response of the Schmidt-Boelter sensor measured in the 25 mm VTBB.
Mentions: The cosine response of the heat flux sensor used in the present calibration was measured in the 25 mm VTBB. The measurements were made for different orientations of the sensor with respect to the radiant source operating at a fixed temperature of 2673 K giving a normal incident flux of 7 kW/m2 at the sensor surface. Measurement results along with the theoretical cosine response curve are presented in Fig. 7. The sensor output measurements for different angles have been normalized with respect to the value at the normal incidence (0°). Good agreement between the measurements and the theoretical response is observed, as expected.

View Article: PubMed Central - PubMed

ABSTRACT

Facilities and techniques to characterize heat flux sensors are under development at the National Institute of Standards and Technology. As a part of this effort, a large aperture high-temperature blackbody was commissioned recently. The graphite tube blackbody, heated electrically, has a cavity diameter of 51 mm and can operate up to a maximum temperature of 2773 K. A closed-loop cooling system using a water-to-water heat exchanger cools electrodes and the outer reflecting shield. This paper describes the newly developed blackbody facility and the validation tests conducted using a reference standard Schmidt-Boelter heat flux sensor. The transfer calibration results obtained on the Schmidt-Boelter sensor agreed with the previous data within the experimental uncertainty limits.

No MeSH data available.