Thermal Shock

Heat shock typically occurs when the infrared sensor is quickly moved from one ambient temperature to another or if a strong, steady thermal gradient is applied along the sensor. Typically, in all infrared sensors for temperature sensing, the internal infrared detector compares incoming infrared radiation with a reference temperature inside the sensor housing. Thermal shock resistance is essential for the pyrometer to deliver accurate and consistent temperature measurements under conditions of rapid thermal variation.

In a dynamic thermal shock, a quickly changing sensor temperature might result in inaccurate readouts until the sensor reference temperature is stable again. An additional compact housing can help to ensure accurate temperature measurements in environments with significant and fast temperature fluctuations.

The thermal gradient along the sensor faces a constant heat flow. This temperature gradient might depend on the process temperature, the ambient temperature, and the mounting. This almost static temperature gradient is what we relate to a “static” thermal shock and results in random temperature deviations. Additional protective housings and thermal insulation are often used to shield infrared sensors from direct exposure to high ambient temperatures, ensuring the pyrometer maintains its performance and reliability in demanding industrial settings.