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Nondestructive test of brazed cooling tubes of prototype bolometer camera housing using active infrared thermography
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Image of FIG. 1.
FIG. 1.

Bolometer housing design for SST-1. The cooling is provided by 12 continuous tubes brazed on the periphery of the pipe.

Image of FIG. 2.
FIG. 2.

Prototype bolometer housing. All the dimensions except the length are similar to the actual housing.

Image of FIG. 3.
FIG. 3.

Schematic of the experimental setup.

Image of FIG. 4.
FIG. 4.

Schematic of the pipe layout. The area limited by the sections A–Z and 1–6 is the maximum internal surface area seen by the mirror at a given time.

Image of FIG. 5.
FIG. 5.

Thermograph of the whole pipe, formed by 30 thermographs of the internal surface of the pipe (see color bar on the right side). Since different sections were scanned in different runs, all these images were taken at a time when the rise in the surface temperature of the section under inspection was 5   from the initial temperature.

Image of FIG. 6.
FIG. 6.

Comparison of the thermograph (right) with the radiograph (left). Surface temperature (see thermograph) of the tube is high at the places where brazing material is present (see radiograph) whereas it remains low at places where the brazing material is absent. The third vertical tube seen in the radiograph is not visible in the thermograph because of the viewing line of the mirror.

Image of FIG. 7.
FIG. 7.

The temporal evolution of temperature in good brazed region (1) and poorly brazed region (2). The temperature of the poorly brazed region lags behind the good brazed region.

Image of FIG. 8.
FIG. 8.

Temperature evolution in one of the six sectors (five sections), shown at three different temperatures of the pipe with time progression from left to right.

Image of FIG. 9.
FIG. 9.

The normalized intensity along the length for two pipes. The normalization is done by dividing the measured intensity with the maximum intensity. These are taken at the time of maximum contrast.

Image of FIG. 10.
FIG. 10.

Histogram of different sections of the tube. The threshold intensity was set at 60% for estimation of contact area.


Generic image for table
Table I.

Dimensions of the prototype bolometer housing.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nondestructive test of brazed cooling tubes of prototype bolometer camera housing using active infrared thermography