Turbine engine exhaust gas temperatures are measured by using

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Turbine engine exhaust gas temperatures are measured by using

Exhaust gas temperature in turbine engines is measured with thermocouples because they tolerate the very high temperatures and provide a fast, direct electrical signal that can be read by engine controls. A thermocouple consists of two dissimilar metals joined at the sensing junction; when the hot exhaust heats this junction, a small voltage is produced that changes with temperature, allowing the control system to determine the exhaust temperature. This setup works well in harsh, high‑temperature exhaust environments and doesn’t require an external power source to generate the signal, which is why it’s favored in aviation. In practice, high‑temperature variants like Type K are commonly used to endure the corrosive gases and thermal cycling of jet engines. Thermistors, while accurate, have a limited high‑temperature range and a nonlinear response that isn’t ideal for the extreme conditions of engine exhaust. Bimetal strips are simple mechanical devices used for switches or indicators, not precise temperature measurement. Resistance temperature detectors are accurate and stable but typically have lower maximum temperatures and require electronic excitation, making them less suitable for the extreme, fast swings found in turbine exhaust compared to thermocouples.

Exhaust gas temperature in turbine engines is measured with thermocouples because they tolerate the very high temperatures and provide a fast, direct electrical signal that can be read by engine controls. A thermocouple consists of two dissimilar metals joined at the sensing junction; when the hot exhaust heats this junction, a small voltage is produced that changes with temperature, allowing the control system to determine the exhaust temperature. This setup works well in harsh, high‑temperature exhaust environments and doesn’t require an external power source to generate the signal, which is why it’s favored in aviation. In practice, high‑temperature variants like Type K are commonly used to endure the corrosive gases and thermal cycling of jet engines.

Thermistors, while accurate, have a limited high‑temperature range and a nonlinear response that isn’t ideal for the extreme conditions of engine exhaust. Bimetal strips are simple mechanical devices used for switches or indicators, not precise temperature measurement. Resistance temperature detectors are accurate and stable but typically have lower maximum temperatures and require electronic excitation, making them less suitable for the extreme, fast swings found in turbine exhaust compared to thermocouples.

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