HAPTIC SYSTEMS

OUTLINE• IMPORTANT CONCEPTS IN HAPTICS.

• EXAMPLES OF HAPTIC COMMERCIAL PRODUCTS.

• APPLICATION IN VARIOUS FIELDS.

• SUMMARY.

WHAT IS ‘HAPTICS’ ? • HAPTICS-The technology that

interfaces human interaction with external enviroinment via touch.

• Developing a computer controlled system to physically interact with a Virtual or remote enviroinment.

• Originated from the Greek word ‘HAPTETHESAI’.

WORKING OF HAPTICS

HAPTIC INFORMATION• TACTILE INFORMATIONS

• KINESTHETIC INFORMATION

• HAPTIC INFORMATION=TACTILE +KINESTHETIC INFORMATION

VIRTUAL REALITY1) Creation of an artifi-cial environment.2) 3D effect.3) Increased realism.4) Special sensory input devices are used.

HAPTIC FEEDBACK BASIC BLOCK DIAGRAM

MAIN ELEMENTS:1) Simulation Engine2) Haptic Rendering Algorithms3) Transducers

HAPTIC DEVICESA device that intervenes a user and computer for hapticinteractions.

CLASSIFICATION1) VIRTUAL REALITY/TELEROBOTICS • Exoskeletal devices• Gloves and wearable devices• Point sources2) FEEDBACK DEVICES• Force feedback devices

SOME POPULARLY USED HAPTIC INTERFACING

DEVICES

PHANTOM i) Devoloped by Sensable Tech.ii) 6 DOF device.iii) Pen based interaction.iv) Serial linkage.v) Force feedback.vi) Was the break-through performancein the field of haptics.

CONTACT DISPLAY DESIGN

CYBERGLOVEDevoloped by Immersion corp.Basic system includes1) Cyberglove.2)An instrumentation unit.3) A serial connection to the computer.4) A virtual hand graphicmodel display.

MECHANICAL STRUCTURE

OTHER POPULARLY USEDHAPTIC DEVICES..

BMW IDRIVE

VIBROTACTILE VEST NOVINT FALCON

HAPTIC INTERFACE

HAPTIC RENDERING

1) Compute the interaction forces b/w the haptic interface and virtual object.

2) Ensure that the haptic device correctly renders such forces on the human operator.

AVATAR 1) Virtual representati- on of the haptic interface by which the user physically interacts with the virtual env . 2) Choice depends on the object simulated and the device capa- bilities.

HAPTIC RENDERING ALGORITHMS

SYSTEM ARCHITECTURE

Contd..

HAPTIC RENDERING TECHNIQUES• Point interaction rendering Single points of a probe, thimble or

stylus is employed.• Ray based rendering Probe is modeled in the virtual

environment as a finite ray.

APPLICATIONS1) Graphical user interfaces.2) Surgical simulation and medical

training.3) Telerobotics.4) Military applications.5) Museum displays.6) Assistive technologies for the blind

and visually impaired.

GRAPHICAL USER INTERFACES.

SURGICAL SIMULATION & MEDICAL TRAINING

MILITARY TRAINING

LIMITATIONS OF HAPTICS

1) Can only exert forces with limited magnitude.2) Haptic systems aren’t ideal force transducers

due to existence of friction, inertia, backlash etc.

3) Haptic rendering algorithms operates in discrete time while user’s in continuous time.

4) The position sensors have finite resolutions.

FUTURE VISIONCan Touch be distributed over space and time, recorded and broadcasted like streaming data?

CONCLUSION 1) Future for online computing and e-

commerce. 2) Enhance the shopper experience

and help online shopper to feel the merchandise without leave their home. 3) Because of the increasing applications of haptics, the cost of the haptic devices will drop in future.

REFERENCES• http://www.technologyreview.com • http://www.sensable.com • jks-folks.stanford.edu/papers/Haptic-

Rendering.pdf • http://www.informit.com• http://www.wikipedia.com• http://www.google.com

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