Which device measures the temperature inside the envelope?

Which device measures the temperature inside the envelope?

• A. Propane
• B. Thermistor
• C. Crown
• D. Gondola

Answer: (B)

Measuring temperature in a confined aerospace environment relies on a sensor that gives a clear, small, and inexpensive signal while withstanding the conditions inside the envelope. A thermistor does exactly that: it is a temperature-dependent resistor whose resistance changes predictably with temperature, allowing easy conversion to a temperature reading with simple electronics. In the envelope, you often need a compact, rugged, low-cost sensor, and an NTC (negative temperature coefficient) thermistor provides high sensitivity over the typical ambient range encountered there. The other options don’t serve as temperature-measuring devices: propane is a fuel, crown isn’t a sensor, and gondola is a payload compartment rather than a sensor.

Measuring temperature in a confined aerospace environment relies on a sensor that gives a clear, small, and inexpensive signal while withstanding the conditions inside the envelope. A thermistor does exactly that: it is a temperature-dependent resistor whose resistance changes predictably with temperature, allowing easy conversion to a temperature reading with simple electronics. In the envelope, you often need a compact, rugged, low-cost sensor, and an NTC (negative temperature coefficient) thermistor provides high sensitivity over the typical ambient range encountered there. The other options don’t serve as temperature-measuring devices: propane is a fuel, crown isn’t a sensor, and gondola is a payload compartment rather than a sensor.