Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing

TMT adopts Stressed Mirror Polishing (SMP) technology for the polishing of mirror segments. In this process, the meniscus type spherical shape glass blanks are converted in to a desired aspheric shape by spherical grinding and polishing in the stressed condition. After each grinding and polishing activity metrological measurements are done using different metrology tools. The metrology tool named as 2D-Profilometer is used for low frequency error/foam measurements. It consists of 61 high precision length gauges attached to Carbon Fiber Reinforced Polymer (CFRP) sandwiched Aluminum panel of diameter 1.6 meter in spiral direction. The coefficient of thermal of CFRP is very low however, a small delta temperature variation between the top and bottom sheet of CFRP of the panel will lead to panel bowing which will result in increasing power error. Hence, the objective this work is to analyse the thermal sensitivity of the 2D Profilometer.

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Published
2024-08-26
DOI
https://doi.org/10.1117/12.3019856
Primary Topic
Laser and Thermal Forming Techniques
Type
article
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article

Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing

Pramod Panchal, Alikhan Basheer, Prasanna Deshmukh, Sanjeev Jha et al.
Laser and Thermal Forming Techniques
article

Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing

Pramod Panchal, Alikhan Basheer, Prasanna Deshmukh, Sanjeev Jha, Sriram Sripadmanaban, Vineeth Valsan
article en

Abstract

TMT adopts Stressed Mirror Polishing (SMP) technology for the polishing of mirror segments. In this process, the meniscus type spherical shape glass blanks are converted in to a desired aspheric shape by spherical grinding and polishing in the stressed condition. After each grinding and polishing activity metrological measurements are done using different metrology tools. The metrology tool named as 2D-Profilometer is used for low frequency error/foam measurements. It consists of 61 high precision length gauges attached to Carbon Fiber Reinforced Polymer (CFRP) sandwiched Aluminum panel of diameter 1.6 meter in spiral direction. The coefficient of thermal of CFRP is very low however, a small delta temperature variation between the top and bottom sheet of CFRP of the panel will lead to panel bowing which will result in increasing power error. Hence, the objective this work is to analyse the thermal sensitivity of the 2D Profilometer.

Indian Institute of Astrophysics (IN), Christ University (IN)
Openalex Percentile: Top 85%
Laser and Thermal Forming Techniques
DOISourceOpenAlex
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Thermal sensitivity analysis of 2D profilometer used for TMT polished glass polishing — Pramod Panchal, Alikhan Basheer, et al. · (2024) | TGRS Research Map | TGRS