title: Laser Calorimetry Spectroscopy for ppm-level Dissolved Gas Detection and Analysis.
abstract: In this paper we report a newly developed technique - laser calorimetry spectroscopy (LCS), which is a combination of laser absorption spectroscopy and calorimetry - for the detection of gases dissolved in liquids. The technique involves determination of concentration of a dissolved gas by irradiating the liquid with light of a wavelength where the gas absorbs, and measuring the temperature change caused by the absorbance. Conventionally, detection of dissolved gases with sufficient sensitivity and specificity was done by first extracting the gases from the liquid and then analyzing the gases using techniques such as gas chromatography. Using LCS, we have been able to detect ppm levels of dissolved gases without extracting them from the liquid. In this paper, we show the detection of dissolved acetylene in transformer oil in the mid infrared (MIR) wavelength (3021 nm) region.
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Nagapriya
authors.initials: N
authors.lastname: K S
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Shashank
authors.initials: S
authors.lastname: Sinha
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Prashanth
authors.initials: P
authors.lastname: R
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Samhitha
authors.initials: S
authors.lastname: Poonacha
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Gunaranjan
authors.initials: G
authors.lastname: Chaudhry
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Anandaroop
authors.initials: A
authors.lastname: Bhattacharya
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Niloy
authors.initials: N
authors.lastname: Choudhury
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Saroj
authors.initials: S
authors.lastname: Mahalik
authors.affiliation: GE Global Research, GE India Technology Centre Pvt. Ltd., Bangalore, 560066, India.
authors.forename: Sandip
authors.initials: S
authors.lastname: Maity