Thermal Influences in Precision Instruments


Why you should measure thermal influences?

Thermal influences are present in all systems and limit the achievable precision e.g. by inducing thermal expansion. In order to compensate for these effects, it is important to measure the thermal influences.


How to monitor thermal influences

The current approach to control thermal effects is based on multi-parameter models. These models are derived empirically, and are used to measure and predict thermal influences. The most common parameters in such models are temperatures at various locations in the system and situational information (e.g. power consumption of motor). A certain compensation of thermal effects is accomplished with this method. However, in some applications, higher measurement precision and robustness towards external factors like changing ambient temperature is required to obtain a satisfactory compensation. This is where heat flux sensors add a lot of value.

“With gSKIN® Heat Flux Sensors, a customer was able to increase the precision within their measurement product by a factor of 4!”

Specifically, gSKIN® Heat Flux Sensors add value to these three areas where temperature sensors are limited:

  1. Non-linear temperature profile: A large number of temperature sensors are necessary to reconstruct the temperature profile with sufficient accuracy.

  2. Temperature resolution: Standard temperature sensors have a limited temperature resolution, which limits the measurement accuracy.

  3. Heat flow dynamics: The change of incoming or outgoing heat flow is unknown since primarly, it is not determined experimentally. An exact statement about whether the system is heating up or cooling down is therefore difficult.

 

For whom is it relevant?

The integration of heat flux sensors for optimized thermal control is only relevant to manufacturers of the highest precision systems. Systems that might benefit from heat flux sensors are:

  • Dosing systems

  • Positioning systems

  • Lithography

  • Bonding systems

  • Metrology systems

If you are unsure about the potential benefits in your products, contact us to discuss it.