Relays, The Electromechanical amplifier

Pyroelectric Infrared Sensor and Fresnel lens

DPB PYD1798 Digital Motion Detector components

DP-001 Digital Motion Detector Module

DP-002 Digital Motion Detector Module

How IR motion detector components work

Focusing devices for pyroelectric sensors

RIR Reflective Infrared devices 


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.


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.

Copyright 2015
Glolab Corporation