Optical sensor for two-phase cooling vapor level measurement

A system for immersion cooling, the system comprising:

• an immersion tank defining an immersion chamber therein;
• an immersion working fluid positioned at least partially in the immersion chamber, the immersion working fluid having a liquid phase and a vapor phase;
• a first energy source positioned and oriented to direct a first infrared beam through a first portion of the vapor phase with a first beam path and first path length;
• a first optical sensor positioned in the first beam path;
• an optical element configured to direct at least a portion of the first infrared beam in a second beam path and a second path length through a second portion of the vapor phase;
• a second optical sensor positioned in the second beam path;
• and
• a microcontroller configured to determine vapor concentration in the immersion chamber based at least partially on data from the first path length, the first optical sensor, the second path length, the second optical sensor, and the energy source.

A method of measuring a vapor concentration in an immersion cooling system, the method comprising:

• positioning a sample portion of an immersion working fluid in a sampling region between an energy source and an optical sensor;
• providing an infrared beam through the sample portion with a beam path and a path length;
• receiving a transmitted portion of the infrared beam with the optical sensor;
• measuring an intensity of the transmitted portion relative to a source portion of the infrared beam;
• and
• determining a concentration of a vapor phase of the immersion working fluid in the sample portion.