Let's Make Robots!

TPA81 Devantech 8 Pixel Thermal Array Sensor


Vendor's Description: 


The TPA81 sensor is a thermopile array detecting infra-red in the 2um-22um range. This is the wavelength of radiant heat. The Pyro-electric sensors that are used commonly in burglar alarms and to switch on outside lights, detect infra-red in the same waveband. These Pyro-electric sensors can only detect a change in heat levels though - hence they are movement detectors. Although useful in robotics, their applications are limited as they are unable to detect and measure the temperature of a static heat source. Another type of sensor is the thermopile array. These are used in non-contact infra-red thermometers. They have a very wide detection angle or field of view (FOV) of around 100° and need either shrouding or a lens or commonly both to get a more useful FOV of around 12°. Some have a built in lens. More recently sensors with an array of thermopiles, built in electronics and a silicon lens have become available. This is the type used in the TPA81.

It has a array of eight thermopiles arranged in a row. The TPA81 can measure the temperature of 8 adjacent points simultaneously. The TPA81 can also control a servo motor to pan the module and build up a thermal image.

Here's a link for full technical specs.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

aww! just found out that PIRs are actually the pyroelectric sensors you were talking about, now i get the difference :)

I would really love to have one of those, maybe i'll pick one when i'll have some more money 

by the way...here it costs much less http://www.hvwtech.com/products_view.asp?ProductID=947 

unfortunatly this one has been "temporarilly sold out" for a while....  :( 

I'm starting to wonder if they get em and sell em out that quick...

What! $63? That's gotta be wrong. Of course, they're out of stock... I'll keep an eye on that page :)

Dan

The difference between this and a PIR is that this thing will give you 8 actual readings while a PIR only gives one signal when a change occurs. Hook this baby up to a servo that move left to right in, lets say, 8 steps: you get an 8x8 thermal picture.

I bought mine from robotshop.us -- I found it for $99, but it seems to have gone up to $110 now. I'll post some thoughts and Arduino code once I've had a little more time to play with it.

Dan