7 Temperature Sensors

Question 1

Describe a thermocouple sensor

Answer 1

Uses Seebeck effect which converts heat to current
Can use different material to get desired values

Benefits:
Operate over a wide range
Inexpensive

Downsides:
Inaccuracies
Possible instability

Question 2

Describe a semiconductor temperature sensor (Transistor)

Answer 2

Operated based on fundemental temperature and current characteristics of transistors
The voltage difference is measured between the collector and emitter and the temperature can be calculated

Question 3

Semiconductor Temperature Sensor (Diode)

Answer 3

Operates by providing a stable excitation current and then measuring the forward voltage drop of the diode.

Question 4

What are the benefits and downsides of semiconductor sensors

Answer 4

Advantages:
Can be integrated into PCB
The manufacturing process for semiconductors is well defined

Disadvantages:
Large temperature coefficient
Delicate