Anirban Roy

currently Assistant Professor, IIIT Surat

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Field deployable tunable diode laser spectroscopy systems for greenhouse gas and air pollutant monitoring


Measurement of greenhouse gases using tunable diode laser spectroscopy (TDLS) is the focal area of my research work. Recent measurements of carbon dioxide levels at multiple locations of Ahmedabad and Gandhinagar have revealed a gruesome picture. The values are significantly higher than the current global average of 406 ppm. This is the first time that a portable TDLS sensor has been deployed at urban locations in India to measure atmospheric carbon dioxide and water vapour. Moreover, the measurements come at a time when the air pollution in major cities like Delhi, Bangalore and Kanpur have reached dangerously high levels and have repeatedly hit media reports over last few years. Although there have been several efforts by various research groups towards atmospheric carbon dioxide monitoring in India, most of them have been done on a campaign basis instead of on a continuous basis. Data is therefore not available over long time intervals and this makes it difficult to study the variations of carbon dioxide fluxes over the Indian sub-continent region. Our measurements clearly demonstrate the need to adopt tunable diode laser spectroscopy for precise long-term monitoring of greenhouse gases in the Indian subcontinent.

Awards

Optical Society of America (OSA) Best Poster Award for the paper 

A Roy, R S Chawhan and A L Chakraborty, "A portable mid-infrared quantum cascade laser-based TDLS system for atmospheric carbon dioxide measurement: results of a week-long expedition to Mount Abu", International Conference on Fiber Optics and Photonics (Photonics 2018), 12-15 Dec 2018, New Delhi

Journal papers

  1. A Roy, A L Chakraborty, “Intensity modulation-normalized calibration-free 1f and 2f wavelength modulation spectroscopy”, IEEE Sensors JournalVol 20, Iss 21, Nov.1, 1 2020, https://doi.org/10.1109/JSEN.2020.3000470

  2. A Roy, R S Chawhan, and A L Chakraborty, "Field deployment of a 4320 nm quantum cascade laser-based TDLS system to compare the background CO2 levels in Mount Abu with foreground measurements in Gandhinagar, India", SPIE Optical Engineering, 59(2), 024110, Feb 2020, https://doi.org/10.1117/1.OE.59.2.024110

  3. A Roy, R S Chawhan, R Patel, S Varadharajan, L M Tiwari, A L Chakraborty, C Ghoroi and G Srivastava, “Quantifying the CO and CO2 mole fraction in the plume of an aerosol-based fire extinguishing agent using 4560 nm and 4320 nm QCLs”, IEEE Sensors Journal, Vol 19, Iss 21, 9728–9735, 2019 https://doi.org/10.1109/JSEN.2019.2927081

  4. A Roy, N K Sharma, A L Chakraborty and A Upadhyay, “Measurement of atmospheric carbon dioxide and water vapour in urban built-up areas in the Gandhinagar-Ahmedabad region in India using a portable tunable diode laser spectroscopy system”, Applied Optics (Feature issue: Near- to mid-IR (1–13 μm) III-V Semiconductor Lasers), Vol 56, No 31, H57-H66, Nov 2017 https://doi.org/10.1364/AO.56.000H57

  5. A Roy, A L Chakraborty and C K Jha, “Fiber Bragg grating interrogation using wavelength modulated tunable DFB lasers and a fiber-optic Mach-Zehnder interferometer", Applied Optics, Vol 56, No 12, 3562-3569 (2017), https://doi.org/10.1364/AO.56.003562

 

Conference papers

  1. A Roy and A L Chakraborty, "Quantum cascade laser-based in situ measurement of atmospheric CO and CO2 in Gandhinagar using 1f and 2f wavelength modulation spectroscopy", IEEE Workshop of Recent Advances in Photonics (IEEE WRAP 2019), 13-14 Dec 2019, IIT Guwahati

  2. A Roy, A L Chakraborty and K T V Grattan, "A 1531.52 nm tunable diode laser-based system for high-sensitivity remote monitoring of acetylene and ammonia leaks in industrial plants", International Conference on Optics & Electro-Optics, XLIII Symposium of Optical Society of India (ICOL 2019), 19-22 Oct 2019, Dehra Dun, India (oral presentation)

  3. A Roy, R S Chawhan and A L Chakraborty, "A portable mid-infrared quantum cascade laser-based TDLS system for atmospheric carbon dioxide measurement: results of a week-long expedition to Mount Abu", International Conference on Fiber Optics and Photonics (Photonics 2018), 12-15 Dec 2018, New Delhi         OSA BEST POSTER AWARD

  4. R S Chawhan, A Roy and A L Chakraborty, "Development of a compact and light-weight 1392 nm tunable diode laser-based system for real-time ambient water vapour measurements ", International Conference on Fiber Optics and Photonics (Photonics 2018), 12-15 Dec 2018, New Delhi

  5. A Roy, R S Chawhan, A L Chakraborty, "A 4320 nm quantum cascade laser-based TDLS system for long-term measurement of ambient carbon dioxide levels at Gandhinagar in western India", Field Laser Applications in Industry and Research (FLAIR 2018), September 10-14, 2018, Italy

  6. A Roy, N K Sharma, A L Chakraborty, A Upadhyay, "Current scenario of ambient carbon dioxide levels at multiple locations in urban Ahmedabad revealed by a 2004 nm tunable diode laser spectroscopy system", IEEE Sensors 2017, Optical Sensors and Systems II Poster session C2P-J, Glasgow, UK, Oct 2017, doi:10.1109/ICSENS.2017.8234369

  7. A Roy, A L Chakraborty, C K Jha, “Fiber Bragg grating interrogation using a wavelength modulated 1651 nm tunable distributed feedback laser and a fiber ring resonator for wearable biomedical sensors”, 25th International Conference on Optical Fiber Sensors (OFS-25), 25-28 April 2017, Korea

  8. A Roy, A Upadhyay and A L Chakraborty, "Open-path CO2 measurement in indoor and outdoor environments in the Ahmedabad-Gandhinagar area using a 2004 nm tunable VCSEL", oral presentation at International Conference on Fiber Optics and Photonics (Photonics 2016), 4-8 Dec 2016, IIT Kanpur https://doi.org/10.1364/PHOTONICS.2016.W4G.2

  9. A Upadhyay, P Chakraborty, A Roy, A L Chakraborty, "Measurement of carbon dioxide concentrations in urban built-up areas using a portable 2004 nm VCSEL-based calibration-free TDLS system with wireless data logging", Field Laser Applications in Industry and Research (FLAIR 2016), Aix les Bains, France, 12-16 Sep 2016

  10. A Roy, A Upadhyay, A L Chakraborty, "High-sensitivity remote detection of atmospheric pollutants and greenhouse gases at low ppm levels using near-infrared tunable diode lasers", Proc. SPIE 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI, 98761W, 4-7 April 2016, New Delhi (May 5, 2016); https://doi.org/10.1117/12.2222785