Physico-Mechanical Metrology: Part III: Thermal, Optical Radiation and Acoustic Metrology

Yadav, Sanjay; Shivagan, D. D.; Bapna, Komal; Jaiswal, V. K.; Sharma, Parag; Saha, Shibu; Singh, Mahavir; Garg, Naveen; Soni, Kirti; Titus, S. S. K.; Aswal, D. K.

This chapter describes the three physico-mechanical metrology streams; temperature and humidity, optical radiation and acoustic and vibration metrology. Among the seven base SI units, temperature and optical radiation encompasses the two SI units while acoustic comprises only derived parameters. Temperature metrology includes realization and dissemination of temperature and humidity parameters, optical radiation metrology includes parameters like illuminance, illuminance responsivity, luminous flux, luminance, colour temperature, colour coordinates and spectral irradiances. Acoustic metrology includes sound pressure, vibration amplitude, sound transmission and absorption coefficients. All the parameters are inter-connected to fulfil the human needs and endeavours and have immense importance in the socio-economic growth of the country. The contribution, insinuation, impact, significance and relevance of these PMPs in different sectors like health, process and manufacturing, lighting industry, building acoustics, SODAR system and noise mapping are described along with established measurement standards and facilities, CMCs, participation in key comparisons, gap analysis and futuristic requirements and suggestions. All these endeavours are carried for the inclusive industrial growth of the nation.