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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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23 Replies

user
Yonatan24 (author)2016-07-18

What project? You need to be more specific.

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Lorddrake (author)2016-06-30

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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verence (author)Lorddrake2016-06-30

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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krishnaramya (author)verence2016-07-11

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

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user

can you give me details about about capacitive coupling

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Lorddrake (author)verence2016-06-30

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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krishnaramya (author)Lorddrake2016-07-03

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

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user
krishnaramya (author)verence2016-07-05

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

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user
krishnaramya (author)rickharris2016-07-04

cutting wood or metal other than skin

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krishnaramya (author)Lorddrake2016-07-11

yaa i saw that. dont know the operation.

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Vyger (author)2016-07-01

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

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user
Rahul - S (author)2016-07-07

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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iceng (author)Rahul - S2016-07-07

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 (author)2016-07-01

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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iceng (author)rickharris2016-07-01

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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rickharris (author)iceng2016-07-01

What about other animals?

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iceng (author)rickharris2016-07-01

Body temperature and hair blocks IR

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iceng (author)2016-06-30

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 !

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