go to the link http://www.lirc.org/receivers.html and also
http://www.google.co.in/imgres?imgurl=https://engineering.purdue.edu/ece477/Webs/F09-Grp07/nb/Shaun/IR%2520Sensor.jpg&imgrefurl=https://engineering.purdue.edu/ece477/Webs/F09-Grp07/nb/spgreene.html&usg=__MGAMCgkXlxFV6O73ub9Zl5iV2zM=&h=1607&w=2164&sz=128&hl=en&start=20&sig2=_8CKy7t4UHKkQZeW4tYRdQ&zoom=1&tbnid=_yvSTnprxwCRDM:&tbnh=167&tbnw=223&ei=WH8ATeHxFobwvwPL5Z3OBg&prev=/images%3Fq%3Dpulsed%2Bir%2Bsensor%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DX%26gbv%3D2%26biw%3D1024%26bih%3D677%26tbs%3Disch:1&um=1&itbs=1&iact=hc&vpx=551&vpy=261&dur=2786&hovh=193&hovw=261&tx=133&ty=61&oei=Fn8ATb_PMoXzrQeUqaiTDw&esq=2&page=2&ndsp=12&ved=1t:429,r:6,s:20
