This Article 
   
 Share 
   
 Bibliographic References 
   
 Add to: 
 
Digg
Furl
Spurl
Blink
Simpy
Google
Del.icio.us
Y!MyWeb
 
 Search 
   
World Haptics 2009 - Third Joint EuroHaptics conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems
Discrimination of thermal diffusivity
Salt Lake City, UT, USA
March 18-March 20
ISBN: 978-1-4244-3858-7
Wouter M. Bergmann Tiest, Helmholtz Institute, Utrecht University, The Netherlands
Astrid M. L. Kappers, Helmholtz Institute, Utrecht University, The Netherlands
Materials such as wood or metal which are at equal temperatures are perceived to be of different “coldness” due to differences in thermal properties, such as the thermal diffusivity. The thermal diffusivity of a material is a parameter that controls the rate with which heat is extracted from the hand when it touches an object of that material. This rate of heat extraction is an important cue for distinguishing materials and recognising objects by means of touch. We have measured the ability of human observers to discriminate between different rates of heat extraction. This was done using a device that displayed different transient temperature profiles to the finger. In different conditions, subjects were repeatedly asked to select the faster-cooling of two stimuli. The discrimination threshold was around 43% of the extraction rate. A rate that was twice as slow also yielded twice the absolute discrimination threshold. When we halved the temperature difference between beginning and end of the stimulus, the threshold did not change as much. This shows that subjects can use the rate of heat extraction as a cue and that they can discriminate between materials if their thermal diffusivities are at least 43% apart.
Citation:
Wouter M. Bergmann Tiest, Astrid M. L. Kappers, "Discrimination of thermal diffusivity," whc, pp.635-639, World Haptics 2009 - Third Joint EuroHaptics conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems, 2009
Usage of this product signifies your acceptance of the Terms of Use.