Evaluating NDIR Optical Cavity Signal Degradation under Field Humidity Exposure
Field humidity degrades NDIR cavities through liquid condensation scattering and mirror oxidation, requiring hydrophobic vents and controlled wall heating.
Iec 60068 Damp Heat
Testing Standard
International protocols define the procedures for evaluating how electronic and optical equipment survives high humidity at constant or cyclic temperatures. Adherence to iec 60068 damp heat requirements ensures that seals and coatings remain effective under tropical or industrial conditions. The test identifies weaknesses in adhesive bonds and protective housings.
Accelerated Aging
Elevated temperature and moisture levels simulate years of field exposure in a matter of weeks. During iec 60068 damp heat cycles, the relative humidity is typically held at 93 percent while the temperature remains at 40 degrees Celsius. Moisture is forced into micro-cracks by this stress.
Moisture Effect
Penetration of water vapor can lead to corrosion of internal circuits or clouding of optical elements. Passing the iec 60068 damp heat test proves that the device can maintain its insulation resistance and functional accuracy in saturated environments. Failure is often marked by a drop in dielectric strength.
Verification Protocol
Assessment of the specimen occurs immediately following the removal from the environmental chamber. Technicians performing the iec 60068 damp heat evaluation check for physical swelling or discoloration. A specific recovery period is often allowed before the final metrological measurements are recorded.
These results are compared against the initial baseline to determine the degree of degradation. Documentation of the temperature profile and humidity levels is required for a valid test certificate.