Sympathetic Haptics Overview


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An overview paper on Sympathetic Haptics presented in 2004 at national level paper presentation competition.

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Sympathetic Haptics Overview

  1. 1. Sympathetic Haptics Paper presented by Ajay Datta (VNIT Nagpur)
  2. 2. Sympathetic Haptics <ul><li>It means communicating the tactile experience to another remote user using some communication channel </li></ul><ul><li>It is a relatively new field still undergoing development </li></ul>
  3. 3. In Touch With Computing <ul><li>What is haptics? </li></ul><ul><li>Haptic (Hap’tik) </li></ul><ul><ul><li>adj.(GR. Haptein, to touch ) </li></ul></ul><ul><ul><li>Of, or having to do with, the sense of touch; tactile </li></ul></ul><ul><ul><li>Websters New World Dictionary </li></ul></ul>
  4. 4. What Is Haptics? <ul><li>Haptics is the science of touch </li></ul><ul><li>It refers to the manual interactions with the environment </li></ul><ul><li>The sense of touch is the brains most effective learning mechanism </li></ul><ul><li>It’s communicated faster to the brain then audio or visual stimuli </li></ul>
  5. 5. Human Haptics <ul><li>There are two classes of sensory information </li></ul><ul><ul><li>Tactile : From skin in contact with objects, fine textures, small shapes etc </li></ul></ul><ul><ul><li>Kinesthetic: Net forces along with position and motion of limbs, for large shapes </li></ul></ul>
  6. 6. Sympathetic Haptics Explained <ul><li>Imagine there are two users A (transmitter) and B (receiver) sitting at two computer terminals. </li></ul><ul><li>A holds an object. The data glove he wears captures the pressure he applies as he uses it. </li></ul><ul><li>A's tactile experience is transmitted over the Net to B, who receives the data using a sensing tool. B is now able to feel the hardness or softness of the object the same way as A feels. </li></ul><ul><li>The screen shows the orientation of A's hand so that B can mimic that orientation for a total experience. </li></ul>
  7. 7. Haptic Applications <ul><li>Medicine </li></ul><ul><ul><li>Surgical simulators for training </li></ul></ul><ul><ul><li>Manipulating robots for minimally invasive surgery </li></ul></ul><ul><ul><li>Telemedicine, remote diagnosis </li></ul></ul><ul><ul><li>Accessibility for the disabled </li></ul></ul>
  8. 8. Haptic Applications 2 <ul><li>One to one training </li></ul><ul><ul><li>Can provide training to sportsmen </li></ul></ul><ul><ul><li>Can help train surgeons </li></ul></ul><ul><li>The arts </li></ul><ul><ul><li>Virtual painting, sculpting </li></ul></ul><ul><ul><li>Virtual musical instruments </li></ul></ul>
  9. 9. Haptic Applications 3 <ul><li>Entertainment </li></ul><ul><ul><li>Video games, simulators that enable the user to feel and manipulate objects in the environment </li></ul></ul><ul><li>Education </li></ul><ul><ul><li>Give remote training to students </li></ul></ul><ul><ul><li>Studying complex data sets </li></ul></ul>
  10. 10. Haptic Applications 4 <ul><li>Industry </li></ul><ul><ul><li>CAD systems </li></ul></ul><ul><ul><li>Virtual prototyping </li></ul></ul><ul><ul><ul><li>Assembly and disassembly can guide final design </li></ul></ul></ul><ul><ul><li>Shape sculpting </li></ul></ul><ul><ul><ul><li>Expressive, free-form shape generation and modification </li></ul></ul></ul>
  11. 11. The Technology Behind Haptics <ul><li>Development of haptic interface depends on the knowledge gained from how humans sense and communicate touch </li></ul>
  12. 12. How Humans Sense Touch Mechanical Stimulus Skin Stresses and strains in the neighborhood of the receptor Receptor Terminal Neural Response
  13. 13. Physiology Of Touch <ul><li>Mechanoreceptors are responsible for detecting touch. For example BNC1 detects light touch </li></ul><ul><li>The tactile information detected by these receptors is sent to the Primary sensory Cortex of the brain where it is processed and acted upon </li></ul>The White shaded area is the primary sensory cortex
  14. 14. Haptic interaction- In humans and in haptic interface device
  15. 15. Design Of Haptic Interfaces <ul><li>It must work with human abilities and limitations </li></ul><ul><li>It must be able to approximate the real world tactile forces </li></ul>
  16. 16. A Good Haptic Interface <ul><li>Free motion must feel free </li></ul><ul><ul><li>Low back-drive inertia and friction </li></ul></ul><ul><ul><li>No motion constraints </li></ul></ul><ul><li>Ergonomics and comfort </li></ul><ul><ul><li>Pain, discomfort and fatigue will detract from the experience </li></ul></ul><ul><li>Suitable range, resolution and bandwidth </li></ul>
  17. 17. Research And Developments <ul><li>A lot of research is still going on in the field of Haptics </li></ul><ul><li>Many haptic interfaces using this technology have been built and patented by many companies </li></ul><ul><li>Sympathetic haptics is a relatively new entrant but is a major focus of research due to its immense potential applications </li></ul>
  18. 18. The Companies Involved <ul><li>SensAble Technologies: </li></ul><ul><ul><li>Producers of haptic interfaces like the Phantom and Ghost </li></ul></ul><ul><li>Immersion Technologies: </li></ul><ul><ul><li>It is involved in using this technology to build interfaces for hospitals, military and in consumer peripherals </li></ul></ul>
  19. 19. Some Examples Of Haptic Devices <ul><li>Phantom: </li></ul><ul><ul><li>Developed by SensAble technologies </li></ul></ul><ul><li>The movie shows the Phantom haptic interface device at work </li></ul>
  20. 20. Cyber glove <ul><li>Cyber glove </li></ul><ul><ul><li>Developed by immersion </li></ul></ul>
  21. 21. Challenges <ul><li>Incomplete knowledge of human touch response limits the realism that can be achieved at present </li></ul><ul><li>Cost of hardware limits the consumer base and thus profit and development </li></ul><ul><li>Portability limits the device's flexibility for different uses </li></ul><ul><li>Users find it hard to pick up information with one grasp of an object, the tactile forces given by these devices are still not perfect </li></ul><ul><li>Low Bandwidth for communication also is a major limiting factor as far as transfer of the touch experience is concerned </li></ul>
  22. 22. Conclusion <ul><li>Sympathetic Haptics has immense potential spanning over diverse areas </li></ul><ul><li>It has already made way into the marketplace but to a limited extent </li></ul><ul><li>For the widespread use of this technology, a major thrust both by the consumers and the corporate world is required </li></ul>
  23. 23. The End