********
**** ********* ** ***** system, ********** ****** *** layers ** ********** ** detect *********. *** *******, contacts ** ********* **** detect ***** ** ******* opening *** *******. ** is **** ********, *******, to **** * ****** layer ** ********** ** case ** ******** ******** or ******** ***** ********. With ****** ********* ********** the ******** ****** *** contacts ********** *** ********, it ** **** ****** that ** ******** **** be **** ** **** entry **********. ******** *** motion ********* ********** **** other, ****** **** ********* each *****. ***** **** one ** *** ***** means **** * ************ burglar *** ** **** to ****** *** ***** system.
Passive ******** ********* (***) *********
*** ****** **** ******** radiation ** *** **** of ****. ****** ********* use ************* ******, ***** ****** *****, ** ****** **** heat. *** **** ***** motion ********* *** * pyro ***** ** ****. As ** ****** ***** in ***** ** *** half ** *** ****, the ****** ** ******* infrared ********* **** ********, causing *** ******* ** one **** ** ***** high ******** ** *** other ****. ** *** object ********* ** **** in ***** ** *** other **** ** *** pyro, *** ******** ********* reading **** ****** *****, leaving *** ****** **** to ***** ****** **** the *****. ****** ********* use **** ********** ** send * ****** ** the ***** *****.
*** ***** **** ******* two *********** ********* ***** looking ******** *****. ****** detectors *** * **** made ** **** ******* to ***** ***** ********* zones *******, ******** ***** detection ***** ** ******* 90° ** ** **** as ***°, ********* ** model. ****** ********* *** a ******* ****, ***** focuses ***** **** **** efficiently **** * ******** lens ** ********** *********. This ****** **** **** infrared ********* ** ***** the ****.
** ** ********** **** efficient ** ****** **** of ***** ********* ***** instead ** *** **** detection *****. **** ****** the ****** ******** ** detect ******** **** ****** and ****** *** ********* of ***** ******. *** this ******, *** **** in ***** ** *** pyro *** * ***** number ** *****-********, **** of ***** ********** ** an *********** **** ** the ****.
Microwave
***** ******** ********* *** passive, ********* ******* ** the ****** ** ********** infrared *********, ********* ****** sensors *** ******, ******* radio ***** *** ********* the **** ** ***** to ****** ****. ******* in *** ****** ** time *** ***** **** to ****** ** *** sensor *** *********** ** motion *** ***** ** alarm *********.
** ********* ********* ****** heat *******, **** *** less ****** ** ** confused ** **** **** environments ** ******* ******* systems. ********* ********* **** some *********. ********* **** detects ******* ****** ******* or **** **** *** detector, *** ****** *** lateral ********. ********* ********** most *****, ***** ***** cause *** ****** ** detect ****** *** ****** motion. ********* ****** ********* metal, *** ***** ***** objects ** ***** ** the ******** ***** ****** a **** ****. ************, microwave ***** ****** ********* are ***** * **** technology ******* ** * band **********, ***** ** less ****** ** ************* penetrate *****, *** ********* less ****** ** *****.
Movement ********
** ** ****** ** cut **** ** ***** alarms, ************* *** ***********-******** integrated ******** (*****) ****** with ******** ********. ***** microcontrollers *** ** ********* the *** *** ********* zones ***** **** ********* shapes, *** **** ** match ***** ****** ******* preprogrammed ********. *** ******* of *** *************** ** to *** ************ ** the ****** ********, ******** the ******** ** **** the ********** ******* * window ******* ******* ** the **** *** * human ******** ******** *** protected ****. ***** ********** and **** ************* ******** profiles **** ******** *** amount ** ***** ******, but *************** ***** **** not *** ******* ***** alarms ** ********** ******.
Dual **********
** ********** ****** ** lead ** ******** ***** alarms, **** ********** ****** to *** **** ********** motion *********. **** ********** detectors *** *** ********* detection ************, ******* ******* infrared *** *********. *** two ************ **** **** to "*****" ****** ******** an ***** *********. ** theory, **** ** * good *** *** *** strengths ** *** ********** to ********** *** *** weaknesses ** *** *****. The ************** ** **** "agreement" ******* **** ************ to ************, *** ********* from ******* ** *******.
**** ******** *** ******** processors ***** "*****" *** environment **** *** ****** in, *** *** ********* technology **** **** ********** ignore *** ******* ** the ********* ****. *** example, * **** ********** motion ******** ****** * ceiling *** **** **** learn ** ****** *** movement ** *** ***, as ** **** ***** the ********* *** *** the ***.
*** ****** ** ******** dual ********** ****** ********* is **** **** ******* the ****** ******** **** not ***** ******* **** not ****** *** **** that *** **** ** simply ******** *** * motion ********. *** *******, a ******** *** ****** a ***** ***** **** or * ********* **** false *****, *** ** the **** ** *** fireplace ** *** ***** reflecting *** *** *****. Replacing *** *** ****** detector **** * **** technology ****** ******** **** cause *** ***** ****** to ****. *******, *** fundamental ******* *** *** gone ****. ** ******** who ********* ***** ****** the ***** ** ********* may *** ***** *** motion ******** ** ** into * ***** ** alarm, ******* ********* **** sees ****** **** **** closer ** ******* ****, not ****** **** ***** from **** ** ****. PIR ** *** ********** that *** ****** ******* movement, *** *** ************** has "*******" ** ****** movement ** *** ******* of *** ********* **** that ********* ****** ***** alarms. *** ****** ******** is ******* *** *** microwave *** *** *** to **** ***** **** motion *** ********** ********, but **** **** ***** happen, ********* *** **** nearly ***********.
**** ********** ****** *** dual ********** ********* ***********. With **** **** ********** motion ********* ****** ** low, **** ** *** see *** *** ** using **** **** ** locations ***** **** ***** suffice. *******, **** *** typically ****** ******* **% and **% ******* **** dual ********** *********. **** margins ** *** *** alarm *************, **** ****** $50 *** *** ***** be *** ********** ******* a ********** ***** *** a *****-**** *****.
Detection ********
*** ****** ********* ******* the ******** ******** ****. Installers ****** ** **** to ***** *** ******** coverage **** ** *** specified *********** ** ******* as ********. ********* ***** detectors ******* * **** to ****** *** **, and **** **** ****** a ******* ** *** protected ***** **** ******** to ****** ****** ******* of ***** ******, *** this ******** ******* ******** a **** ** ****** the ***** **** ** the ********* *****. ****** a ******, * ****** detector ****** ****** ***** out ** ******** *** instead ****** **** * flat ******* ** *** at, **** ** * wall.
*********, ***** * ****** detector ***** *** * distance ** **' (**.** meters) ** * ***** much ****** **** **** will ******* *********** **** from ******** *** *****, and **** ******* **** technology ********* **** ***** microwaves, ** ***** *****:
***** * ****** ******** to ******* ** **** significantly ******* **** *** stated ***** ******** ******** as ****. *** ************** is ********* ** *** and ******** ******. ***** shapes *** ********** ** the ******** ***** * specific ******** **** *** motion ********. ** ** object ** ************* ****** than *** ** *** patterns *** ****** ******** has ** *** *******, it **** *** ** able ** ******** **, and **** ****** ********* will ************* ** **** an ***** *****. **** can **** ** ************* more ***** ****** **** innocuous ******* **** ** insects ******** ** *** outside ** *** ******** or ******** ***** ***** by ******* *******.
****** ********* *** ********* in ******* ********, **** of ***** *** ******** for ******** *****. **** motion ********* *** **********, and *** ******* ******** tasks. ****** *** ******* different ***** ** ******** out *** ****, ***** changes *** ********* **** pattern. *** **** *** shape ** *** ********* zone ** ******* ****** in *** ******, **** sheet, *** ********* **** the *** ********** *** motion ********. ********** ****** be **** ** ****** a ****** ******** **** a ********* **** **** matches *** **** ** be ******* ** ******* as ********.
Look-Down **********
**** ****** ******** ****** include ******** ****, **** called ***** **** **********. This ** * ****** lens **** ******* *** pyro ******* *** **** beneath *** ****** ********, preventing ********* **** ******* the ****** ******** ** crawling ** *** *****. Many ****** ********* ***** zone ********** ** ** disabled ** ********* **** pets ** ******* *******.
Pet ********
**** ********** ****** ********* on ***** **** ****, installers *** **** ** use *** ****** ****** detectors. ***** *** *** types ** ****** ********* designed ** **** ****** pets. *** ******** ****** detectors *** * **** sophisticated ************** **** ** extensive ******* ** *** shapes *** ******** ********, where *** ****** ********* combine ************* *************** **** dual **********. ********* ********, pet ******** ********* ****** be ********** *** ******* pets ******** ***** ** pounds (****), ***** **** technology ********* *** *********** for **** ***** ****** (45kg). ******** ****, ********** cats *** ***** ******** pets, *** **** ***** even **** ********** ********* impractical. *** **** ***********, see ****** ****** ****** ******** overview.
********
**** ****** ********* ******* antimasking **********. ** **** of *** ****-******* *******, the ****** ******** **** periodically ******* *** **** to ****** **** *** size, *****, ******* ******, and ********** **** ** the ********* **** *** not *******. ** *** detector ****** ******* *** area, ** ********* **** its **** *** **** covered *** ***** * trouble ******. * ****** tactic ** ************ ******** crews ** ** ******* the ***** ** * business ****** *** ***, while ** ** ********. The **** *** **** break ** ***** ***** or ***** * "****-******" to *** *** **** in. *** *** ** disable *** ***** ** to ***** ****** *********, or *** ** ******* to ***** ****, **** tape ** * ***** of *****, ******** *** detector. *********** ********** ****** the **** ** * problem, ** **** *** check *** ****** *** cover. **** ***** ******* technology, *** *** **** must ** ******* ** physically ***** *** ********, and ****** ** ********** to ******* ********** ** deal **** * ********* break-in.
Mounting *******
*** ****** *** ******** profiles ** *** **************'* library ** ********** ** an ******** ******** *** detection **** ** ************* ways. **** ** **** predetermination ** *** *** detection ***** **** ****** a ****** ******, ********* at **** *****. *** that ******, *** *********** mounting ****** ** *** detector **** ** ******* to. ******** *** ******** too *** *** ***** the ******** ** *********** the ********, ******* ** false ******. ******** ** too **** **** ***** a ***** **** ***** the ********, **** ** the ****** ******** *** a ***** ****.
Insects ******** ***** ******
******* **** ** ********* by *** ****** ** a ****** ******** *** will **** ******. ******* crawling ****** ** *** inside ** *** **** or **** *** **** will ** *********** ** motion. *********, *** ******** to **** *** ***** in *** ****** ******** housing, ********* **** ********* and ***** *****.
Heat ******* ******** ***** ******
****** ********* ****** *** face **** ******* ** possible. ***** *** ********** and ******* ***** ****** choosing * **** ** mount *** ****** ********, and **** *** ******** that *** ****** ******** may ***** ** **** place * ******** ****** in *** ********* ****.
Reflective ******** ******** ***** ******
****** ********* ****** *** face ********** ******** ** possible. ********** ********, ********** polished ** ********* *****, will ******* *** **** source, ***** *** ****** detector *** ******** ** motion. **** ********* ***** may ****** *** **** signature ** *** **** sufficiently ** ** ******** as ******. ******** *** been ***** ** **** objects ****** *** ********* area ************ ** ***** false ******, ** ***** facing *** ****** ******** towards ***** ***** ** carpet ** ***** *******. Light ******* **** *****, such ** ***** ** timers, *** **** ********* cause *********** ********** ** change *** ******** ******* of *** ****.
Hanging ***** ******** ***** ******
*****, ********, ***** ********, and ***** ******* **** hang **** *** ******* and *** **** ** breezes ****** ** ******* air ************ ** ******* are *** ****** ******* of ***** ******. ******* placement ** ******** **** installing ****** ********* ** grocery ****** *** ***** retail *********. ******* ******* and ***** ******** ******** may **** ** ********** to ****** *** ** profile ** *** ********* zone, ******* ** ***** alarms.
Screw ************** ******** ***** ******
************** ** *** ******** screws *** **** *** housing ** *** ****** detector, ***** ** **** may **** *** **** plastic ******* ****, ********** changing *** **** *** shape ** *** ********* zone. **** **** ** taken ** *** ********** technician *** ** **** or ***** *** ******* in *** ***.
Multiple ** ******** **** ******** ***** ******
*** ****** ****** ********* work **** **** ****** pets *** **** ** stay ** *** *****, but **** *** ** able ** ******* *** climbing *******, **** ** cats, ** ******** ******* in *** ********* **** at ****. *** *** customer ***** *** ****** and *********** ** ***** pets ****** ******** ** add * ****** ********.
Detection **** **** *** ******** ************ **** ********* ***** ******
****** ********* **** * large, **** *******, **** as * ****, ** terminate *******. *********, *** IR ********* ** *** detection **** *** ****** in ********** ****, ******* to ***** ******.
Hot *****
****** ********* ******* * background ********** ** *.*°* (2°C) ** ****. *********, they ****** *** ** used ** ***** **** regularly *** **** ***. Do *** ******* ****** detectors ** ********* ** near ********* **** *** reach ************ ** **°* (32.2°C) ** ****.
Selection *****
****** ****:********* ****** ******* ******, reflective ********, ***** ******. Recommendation ** **** ********** motion ******** **** ******** technology.
****** **** **** ***: ********* ****** ******* drapes, ****** ***** ***, baseboard ******. ************** ** Pet ****** ****** ******** (40lbs) **** ***** **** disabled.
*******: ********* ****** ******* Heat, ********** ********, **** from ****, ***** *****. Recommendation ** ***** ****** detector ***** ****, ****** island, ****** **** **** oven. *** **** ********** with *****-***** ********.
********** *******: ********* ****** ******* insects, ********, ******* ******* from *******, ********** ******** Recommendation ** ** ****** motion ******** **** *** minimum ******** ******, *** white ***** ********. **** housing ********** **** ********.
********: ********* ****** ******* skylight ***** ** **** for ********* ** ***** glass *** ***** ****, but **** *** ****** light **** ******** ***** regular ***** ****** ******. Recommendations ******* ****** ****** detector **** "*******" ****, which **** ******* * narrow **** **** ***** the ********. ********* ****** through *** ******** **** be ********, *** *** rest ** *** **** will ** *******.
Comments (6)
Undisclosed Integrator #1
The is one of the best articles on motion detectors I've read. I've been using motion detectors for over 30 years and have experienced everything outlined here. When pet immune motion detectors were introduced, I was skeptical at first but then found them to be suitable for just about most of my installs. However, great care must be used when cats are involved. You might as well consider cats to have wings when considering motion detectors.
In the early days of pet immune detectors, one of my installs, with two cats in the home, used a pet immune PIR detector in a hallway that looked into an office. I followed the manufacturer's instructions to the letter, but had a false alarm. I returned to the job and relocated the detector on the opposite end of the hallway where it did not see into any other room, also masked off a few places on the lens. I walk tested and the motion detector picked me up just fine. No more false alarm since.
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guy fauquembergue
Good article, but what about outdoor pir detectors can we use IP enabled motion detectors particularly expensives or plug and play detectors triggering camera inputs (never easy to install due to the voltage). Best regards.
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Joseph Marotta
Best explanations on detectors that I've ever read. Thank you!
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Undisclosed Integrator #2
Great Article!
There are many Ip outdoor cameras that have inputs and outputs to use as triggers for notifications or tripping alarms. You can set them up to work in almost any situation. You can adjust the sensitivity better for size or for just certain areas where a motion is not as forgiving. I have used outdoor motions in the past in high secure areas. Setup is not fun and usually takes a lot of time to setup properly. You will still have "false alarms" because of birds and wind.
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