Figure 3
From: Laser Calorimetry Spectroscopy for ppm-level Dissolved Gas Detection and Analysis

(a) Schematic of the experimental arrangement used for LCS (b) Sample and reference cell design (c) Electronics and the Wheatstone bridge arrangement used to eliminate room temperature fluctuations and other common mode noise and to increase the dynamic range of the measurement (d) Bubbling set-up used for the preparation of transformer oil with dissolved gas of a desired concentration.