These heat flux meters usually consist of thermopiles which provide an electrical signal which is in direct proportion to the heat flux.
22.
He used it to experiment on the photography of the moon with wet plates and also began to study solar radiation using thermopiles.
23.
They are also used widely in heat flux sensors ( such as the Moll thermopile and Eppley pyrheliometer ) and gas burner safety controls.
24.
Later, the system was improved to replace thermopiles with an Inertial Measurement Unit ( IMU ) using a combination of accelerometers, gyroscopes and magnetometers.
25.
Another kind of sensor used in ear thermometers, called a thermopile, performs a continuous measurement of emitted infrared energy, rather than taking a snapshot.
26.
Here, a larger voltage is needed than in a pilot flame safety system described above, and a thermopile is used rather than a single thermocouple.
27.
This was soon outdone by the first true IR iceberg detector, which did not use thermopiles, patented in 1914 by R . D . Parker.
28.
Thermopiles are also used to generate electrical energy from, for instance, heat from electrical components, solar wind, radioactive materials, laser radiation or combustion.
29.
Other heat flux sensors include Gardon gauges ( also known as a circular-foil gauge ), thin-film thermopiles, and Schmidt-Boelter gauges.
30.
Because a thermopile sensor takes an average of five temperature readings, it must be left in the ear several seconds longer than necessary with a pyroelectric ear thermometer.
