SENSITIVE SKIN

OUTLINE

INTRODUCTIONSKIN MATERIALSDEVICESSIGNAL PROCESSINGADVANTAGESDISADVANTAGESAPPLICATIONCONCLUSION

INTRODUCTION

What is sensitive skin?It is a large area flexible array of sensors, with data

processing capabilities, with the ability to sense the surroundings.

It make possible the use of unsupervised machine in our midst.

INTRODUCTION

Machines in unstructured environmentsSocietal needs and concerns

a) Health industry

b) Eco friendly

c) Difficulties of acceptance

SYSTEM COCEPT

FIG: Sketch of interconnects between sensors, intelligence and actuators

RESEARCH ISSUES

Skin MaterialsSensing DevicesSignal and Data ProcessingApplications

SKIN MATERIALS

Hold embedded sensorsFlexibleStretch, shrink and wrinkleNovel wire materials

Substrate / interconnect issues

1. Stretching and bending make the substrate thin or place interconnects at neutral

plane

MODELS

Three different models of substrate / interconnect system evolved:

1. Saran wrap model

2. Soccer ball model

3. Panty hose model

Adding Sensors To Substrate

1.Hybrid Approach

2.Integrated Approach

In here circuits are directly on the substrate .

This method avoids the high cost and reliability issues of hybrid assembly.

3. Distributed Intelligence Approach

A network of optical fiber are used to sense the properties

Devices For Sensitive Skin

1.Flexible or deformable2.Power storage3.Deployed 2-D array4.Smaller array5. Self sensing ability6.Measure distance to objects7.Studies in h/w architecture8.Unique properties

Large - Area Electronics1.Organic electronics and optoelectronics on

flexible substrates.

OTFT

2. Thin Film MEMS Thin film micro electromechanical (MEMS) devices on

plastic substrate demonstrate that mechanical sensors can be built on flexible substrate .

3. NanostructuresUltra large area ICs embedded into electrotextiles

Manufacturing Of Large Area Sensitive Skin

Printing techniques

1.Direct Printing

2.Laser Writing

3.Nanoimprinting

Direct Printing

Laser Writing

LASER WRITING

Laser writing is combined with MAPLE process:

1.Electronic circuit patterns are formed

2.Move the receiving substrate 1 beam dia.

3.Assemble to get desired pattern

Nanoimprinting

PrincipleA thickness is created which is transferred through resist

layer via on O2 plasma based etching process.

Fig shows a nanoimprint lithography (NIL)

SIGNAL PROCESSING

Fault ToleranceData ReductionData Processing

ADVANTAGES

Reversal of negative impacts of machinesReduction in weight and thicknessCan be rolledFIR AND IIR filters conserves the battery power.Friendly to environment

DISADVANTAGES

Skin be able to conform to arbitrary shapes.Able to flex, bend and stretchProperties of fusion vary when components fail

or repaired.

APPLICATIONS

1.Human skin or Wearable skin

2.Sensitive skin for machines

3.Environmental sensitive skin

4.Actuated sensitive skin

FUTURE SCOPE

Develop new inexpensive consumer electronicsDisplays, printersStore and information Ranging from medicine and biology to machine

industry and defensespace exploration, mine detection

CONCLUSION

Sensitive skin will make it possible to have unsupervised machinery in unstructured, unpredictable surroundings. It will make the machine cautious and eco friendly. It is an enabling technology with far reaching application The state of art in the areas that are basic to the development of skin technology shows that highly efficient devices are feasible. All this non withstanding the fact that the existing prototypes are clumsy, have low resolution, accuracy and reliability, and are not yet ready for commercialization.