Parts for Pyroelectric Infrared Motion Detector
Below are pictures of a Pyroelectric Infrared sensor and Fresnel lenses. Each of these items is sold separately so you can buy only what you need.
The sensor has a built-in FET amplifier for low output impedance. It is in a TO5 package and will operate at up to 10 volts.
The FL25 is round and 0.75 inch diameter with a 0.5 inch active area, a 0.25 inch focal length and a 26 degree field of view.
The FL40 lens is round and 1 inch in diameter with a 0.9 inch active area, a 0.4 inch focal length and a 15 degree field of view.
The FL65 lens is 1.5 inch square with a 1 inch active area, a 0.65 inch focal length and a 10 degree field of view.
Lenses are 0.015 inch thick and made of a plastic that passes infrared in the wavelength range of 8 to 15 microns which is most sensitive to human body radiation. These are not wide angle lenses. Read how infrared motion detector components work.
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| PIR325 Pyroelectric | FL25 Fresnel lens | FL40 Fresnel Lens | FL65 Fresnel Lens |
| Infrared Sensor | 3/4 inch diameter, 1/2 inch active area | 1 inch diameter | 1 inch diameter with flange |
| $4.00 | 0.25 inch focal length | 0.4 inch focal length | 0.65 inch focal length |
| $2.40 | $4.00 | $4.00 |
See how IR motion detector components work
See how to order for price and ordering information.
and view or print a file containing dimensions and specifications for the
Fresnel lens, PIR, enclosure and PC board
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Visit our Related and Useful links to view or print data sheets on the devices used in this project and on other discrete and integrated circuits from major semiconductor manufacturers.