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Is there any sensor that can detect human skin? Answered

I am working on a project that  involves detection of skin. The sensor should be in such a way that it should differentiate human skin from other objects like wood,plastic,metal.

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Yonatan24

2 years ago

What project? You need to be more specific.

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Lorddrake

2 years ago

yes. that is how a touch lamp works.

For even higher end sensors, check out a product called sawstop. It is a table saw that will stop in 1/1000th of a second to prevent cutting off a finger. It mangles the saw but saves your digit.

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verenceLorddrake

Answer 2 years ago

Well, no. Both of your examples work with capacitive coupling. You can trigger them by touching the sensor / blade with a piece of metal you hold in your hand.

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krishnaramyaverence

Answer 2 years ago

can you give me any information about capacitive coupling .or any links which could help me understand,

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Lorddrakeverence

Answer 2 years ago

can you be more specific about what you are trying to accomplish in order to get a better answer to your question.

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krishnaramyaLorddrake

Answer 2 years ago

while cutting operation there are serious accidents so inorder to avoid this i need a sensor whichich detects human skin

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krishnaramyaverence

Answer 2 years ago

yaa like that only but any other sensor which can sense skin

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Vyger

2 years ago

Just take a bite, if it screams or hits its probably a person.

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Rahul - S

2 years ago

I think mobile touchscreen may help you.

You can check that nothing else is sensed by cellphone touchpad except our fingers and other body parts.

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icengRahul - S

Answer 2 years ago

Conductive foam tip metal pencils work very well when your old skin fingers are too dehydrated to activate a touchscreen.

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rickharris

2 years ago

I think the simplest way would be to look for body heat with a thermal sensor. Most non human things are hotter or colder then humans - HOWEVER you skin can be cold depending on the place and weather. Indoors you are probably OK. but perhaps combining 2 sensors will be the answer say heat and colour.

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icengrickharris

Answer 2 years ago

That is why reflecting infrared light ( LED ) off blood cell pulsations works giving skin a unique biometric compared to inanimate materials which could be colored to resemble skin.

Skin is transparent to IR. Blood however reflects IR.

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icengrickharris

Answer 2 years ago

Body temperature and hair blocks IR

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iceng

2 years ago

A combination of two or three sensors should do be able to differentiate.

OBJECT------------I_R-------------CONDUCTIVE-------------THERMAL

PLASTIC--------yes_&_no---------USUALLY_NO-----------------NO

METAL--------------NO---------------YES_Strong-------------------NO

SKIN----------------YES--------------YES_weak-------------------YES

------------------------------------------------------------------------------------------------

IR
light passes through skin and reflects off of blood, so reflected
INFRA-RED light can detect heart pulse rate. A pulse rate detector
may be the only sensor needed.

But there are skin areas that have no evident pulsing blood !