IGF::OT::IGF MESA PHOTONICS, IN COLLABORATION WITH THE COLLEGE OF OPTICS AND PHOTONICS (CREOL) AT THE UNIVERSITY OF CENTRAL FLORIDA, PROPOSES TO DEVELOP A SPACESUIT GAS SENSOR BASED UPON ITS ENHANCED RAMAN GAS SENSOR (ERGS) TECHNOLOGY. THE GOAL A MOISTURE TOLERANT, DROP-IN REPLACEMENT FOR THE CURRENT CO2 SENSOR. PRELIMINARY WORK ACHIEVED DETECTION SENSITIVITIES FOR CO2, CH4, O2, AND N2 OF 1000, 300, 1000 AND 1500 PPM, RESPECTIVELY. ERGS REPORTS GAS PARTIAL PRESSURES DIRECTLY AND CAN OPERATE TOLERATE PURE OXYGEN. THE RESPONSE TO ALL GASES IS LINEAR FROM 0 TO 100%. NO CONSUMABLE SUPPLIES ARE REQUIRED AND ERGS IS SELF-CALIBRATING.