How Can an Op Amp Circuit Control Constant Current in a Pirani Vacuum Gauge?

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SUMMARY

The discussion focuses on utilizing an operational amplifier (op amp) circuit to maintain a constant current in a Pirani vacuum gauge. The gauge measures pressure based on the heat dissipation from a resistance wire, which is influenced by gas molecules. A detailed explanation of the op amp circuit design is requested to achieve this constant current delivery, along with methods to measure the current through an external fixed load resistor for feedback into the op amp system.

PREREQUISITES
  • Basic understanding of operational amplifier (op amp) circuits
  • Knowledge of constant current sources
  • Familiarity with resistance measurement techniques
  • Concept of heat transfer in gas environments
NEXT STEPS
  • Research op amp circuit designs for constant current sources
  • Learn about feedback mechanisms in op amp circuits
  • Explore methods for measuring current through resistors using op amps
  • Investigate the principles of heat conduction in vacuum environments
USEFUL FOR

Electrical engineers, circuit designers, and anyone involved in vacuum technology or instrumentation requiring precise current control.

Myrddin
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In a pirani vacuum gauge the pressure is determined by the rate at which heat is conducted away from a resistance wire by gas moleculs. The heat is supplied using a constant current source and the rate of heat dissipation determined by the temperature induced change in the resistance of the wire.

Draw an op amp circuit that can be used to deliver a constant current to an external fixed load resistor. Explain how it works in detail.




Have very basic knowledge of op amp circuits and this question has thrown me, any help will be appreciated. Already posted in engineering section to no avail so far!
 
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Can you think of any ways to measure the the current through the external fixed resistor in a way the opamp can use?
 

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