FEAT RE FEA ATURE
SENSIING
NG TECHNOLOGHNOLOGY
PAPIR – A NEW APPROACH T O OCCUPANCY
CY DETECTION and how
targe allow
Richard Thornton,RichardThornton, managing director of Panasonic ElectricWorWo ksUKexplores the adva capabilities of the l test Passive
capabi ties of the latest Passive Infrared sensors (PIR) and how t ey are f ci get are
naging director of Panasonic Electric Works UK explores the advanced ared sensors (
owing slightmovement detection.An
rea tobemuchmore ov
example of a typical applicationcouldbe the sensormountedina toilet cubicle todetect occupancy. The standard the entry
slightmovement detectionare rddetectionringdetects
ry andleaving of anoccupantwhile the rea detects the
ovement. The same scenariowouldapply to detectionof anoccupiedbed. The standard
presence of the occupant evenwithveryvery little mov
mov ovement to andfro reathingmov
slightmovement detectionarea candetect the slight bre
rddetectionringdetects the romthe bedwhile the re
ove
sensing are appro
overage vements of the occupie r
thatwouldnormallynot be detected. The ‘Hammerhead’ PIRhas a rectangular rea,with88s
roximately a4:1 rat
better cov rage cov
basic requirement for building automation originates in the fact that there is a need to identify the presence of people in the controlled areas. The solution to this problemis to use some form of occupancy sensor to detect the presence of people in an area. Theoccupancysensor type
A pemostwidelyuse
thebuildingautomationindustrystryisthePIR (Pa
Passive electro spe
mov owev ot ra ri ow
pectruminwhichra ove
Howeve pro
sedin
veInfrarerared)sensor.PIRmotionsensorsuse romagneticradiationinthelowinfrarerared radiationemittedbyhuman
vement isidentifiedusingaPIRdetector. verminiaturisationof R ev
roblematicwhencompareparedtotheusual miniaturisationof
ofotherelectro re ro ofPI devicescanproveoverov roniccontroldev evices.
Many of theseproblems arise due to the structure andcharacteristics of the sensor device sincePIRmotiondetectors use thermal sensors todetect the small temperature incre
ra exposedto ra rcesare
lens arrayneededfor the focus and re
reincre
tothenecessary theov
necessity topro thelow
owe
large pow
gerpro roj
overaverall size Of equal imp ort crc
westquiescent curre re re
reasepresentwhenthe sensor element is radiation. Inaddition, the required
re
detection/eliminationof any returning light sourc
reasinglydifficult tomanufacture ry tolera .
rancelimits, thesmaller rtanceis the
roducecontrolro ircuits that take rentspossible.
utilisedinastandbymodeis very smallbut ifa oject is consideredthecumulative kenby somehundre
Obviouslyonanindividualbasis thepower very
ow ower take reds (or ev even thousands)ofdevices canbeveryvery significant. 20 20 Feb uary 201 bruarr 2017 | ELEC ELECTRONICS ke re the deve
For yearsPanasonicR&Dhas investiga velopingbui
ve
lding automationmarkets gated
andset intoplace a designcriteria thathas seenanumber ofminiature pro
roducts successfully
developed.Ago example–thePaPIRsensor–combines miniaturisationwithpra
ra ge cov ro
re self-containedPIR good
ractical specifications
that allows awholehost ofnewapplications. The company’sPaPIRsensor range overs detectiondistances from2mthro yo
areamov
vements, focusedspot areas andge ovement. This is to cov
oo genera ral
internalbuildingcon ro De incorridorsmayreq re
ge re
ralare ew
repeatedslightmov sheltereteredaccommod checkare
ec ft
owe vers relessdet
oftendifficultenv werversionsallow
ff kenfro
trol.Detectionofmov
whilstoccupationofaroommaycall fo genera
draintake
pushthesensorto fferre anof pow wire ra
oorwaysfo off
fora roughto 12m
andbeyondwithversions todetect slight body move
re uirealongdistanceversion ro
reatype.Newapplications suchas ove
reasindoorway forcountingpurposes offe reliabledetectionwithin nvirovironment.Specialultra-lowra ow owlonglifeuseinre ote
vementdetectionwithina odationenvironvronmentorspot po
po fe
FournewPaPI productshave beenreleased byPanasonic inord
h powepowersourc R ro
complement the existing ra ge re ge ove ve
rder to expandand range:
The ‘Saturn’ PIR- This unithas a lens that has twodifferent detectionareas.Anouter ring offers generalmov ment detectionwitha 48segment ring that gives standarddetection sensitivities. The inner ringhas 36segments in rangem
adenser arra ge ent andthis allows the ow rce. remot te
etectionsystsystemswithminimalcurre romt e ow
rent ot
over awide area of ove vers
vement Figure 1: Figure 1:
Panasonic’s new range of P
R products
anasonic’s new range of PaPIR products
io. This allow egments, in
a standardlens. Theuse of cov andsplitmasks ext
sensor inspecific applications.
The ‘LenslessPinhole’ PIRdoesnot use a specific lens but ra cov
rather uses thenatura overage
achieve ina very
of the lens a very flath ra
detectionov contact ismadewithin roughthe are ral are rea
ge of the sensor tobeutilisedto achieve over small range
ve
ge.Due to the absence eadarea canbe
vedmaking the sensor ideal formounting ry confinedspace orwhere dire
themounting fra rect
re rame.A
typical applicationmaybe touse the sensor in a door frame to identify any occupantmoving thro
limitedto appro
rea. The detectiondistance is roximately2mhowev
course is usually gre so the sensor canre
ove a cert ever this of
reater thana doorfrarframe and relia bly detectmovement .
The ‘Pet Immunity’ PIRhas aninternal lens mask that canallow abov
owdetectionofmove ov rtainheight but avo below owthis leve vement voidany detection vel. This canbe veryusefulwhen
usedindomestic applications tohelpavoid llow
detectionbypets but a owing re detectionofhumanoccupancy.
ge m ve reliable
As canbe seenmanynewversions of the successful PaPIRsensor range are continually beingdevelopedor i proved.While thehigh demandforhighre PIRS exists there
reliability, self-contained, re is plenty of scope to continu e
product andcontinue t topushthe technical b
expectations andnew
omeet customers’ oundaries of the
ewrequirements. re Panasonic Electric Works UK
www.panasonic-electric-works.com/uk T: 01908 231555
www.panasonic-electric-works.com/uk ows amuch
overage of corridors, office areas and ge of specific areas thanis possiblewith overingmasks
xtends theusefulness of the vance d owthey are facilitating lighting control ng l ght ng cont re sensitive ve so
PAPIR – A NEW APPROACH TO OCCUPANCY DETECTION
/ ELECTRONICS
ELECTRONICS
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