Bolometer housing design for SST-1. The cooling is provided by 12 continuous tubes brazed on the periphery of the pipe.
Prototype bolometer housing. All the dimensions except the length are similar to the actual housing.
Schematic of the experimental setup.
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.
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.
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.
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.
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.
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.
Histogram of different sections of the tube. The threshold intensity was set at 60% for estimation of contact area.
Dimensions of the prototype bolometer housing.
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