8c120 college 06 sensors and transducers.ppt
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8/18/2019 8C120 College 06 Sensors and Transducers.ppt
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8C120 - 201
Inleiding Metenen Modellen – 8C120
Prof.dr.ir. Bart ter Haar Romeny
Dr. Andrea Fuster
Faculteit Biomedische Technologie
Biomedische Beeld Analyse
www.mia.mt.tue.nl
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8C120 - 201
Inleiding Metenen Modellen – 8C120
Sensor & Transducers
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8C120 - 201
!e Meetcyclus" senso#s en t#ansduce#s
$%ect &ignaal Meting Analyse In'o#matie
Cont#olen(o'
Feedac)
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8C120 - 201
&enso#s en t#ansduce#s
T#ansduce# ont*angt ene#gie *an het te meten o%ect. T#ansduce# +et de+e ene#gie om in een *o#m die
#ui)aa# is *oo# het meetsysteem.Voorbeeld: een )wi)the#momete# +et tem,e#atuu#
om in hoogte *an de )wi))olom.In dit college" t#ansduce#s die ene#gie om+etten naa#
het ele)t#ische domein. T#ansduce#s )unnen +owel aan de ingang senso# als
aan de uitgang actuato# *an een meetsysteem
*oo#)omen.Meestal een wis)undig *e#and tussen ingang enuitgang *an een t#ansduce#.
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&enso#s en T#ansduce#s
Twee ty,en t#ansduce#s" actie' en ,assie'
1. Actief senso#
/ te#ne ene#gie#on nodig
/e#ande#ing in 'ysische g#ootheid leidt tot een *e#ande#ing ineigenscha,,en *an de senso#
/ oo#eeld #e)st#oo)%e" *e#ande#ing in lengte leidt tot een
*e#ande#ing in wee#stand. !e+e *e#ande#ing in wee#stand
)an alleen wo#den waa#genomen in een ete#n ele)t#isch
ci#cuit ete#ne ene#gie#on nodig
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&enso#s en T#ansduce#s
Twee ty,en t#ansduce#s" actie' en ,assie'
2. Passief o' sel'-gene#ating t#ansduce#
/ 3een ete#ne ene#gie#on nodig
/ Con*e#tee#t 'ysische g#ootheid #echtst#ee)s naa# ele)t#isch
signaal
/ oo#eeld" the#mo)o,,el tem,e#atuu#*e#schil tussen
twee d#aden leidt tot ele)t#ische st#oom
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&enso#s en T#ansduce#s
4lassi5catie
$, asis *an o,e#ationeel ,#inci,e"
1. 6esisti*e senso#s en #idge ci#cuits
2. Ca,aciti*e senso#s
7. Inducti*e senso#s
. &el'-gene#ating t#ansduce#s
9. &electie c#ite#ia *oo# t#ansduce#s
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8C120 - 201
6esisti*e senso#s
1. Restroo!e dit college". RTD #esisti*e tem,e#atu#e de*ice" wee#stand ,latina
neemt toe i% toename tem,e#atuu##. T$ermistor :TC; 6eade# 1" wee#stand hal'geleide#
neemt toe i% toename tem,e#atuu#%. P$otoconductie cells 6eade# 2" lichtaso#tie
leidt tot *e#ande#ing in ele)t#onencon5gu#atie watleidt tot a'name wee#stand
'. Potentiometer" ,ositie *an de )no, e,aalt de
wee#stand dit college
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8C120 - 201
6e)st#oo)%e – st#ain gauge
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6esisti*e senso#s – st#ain gauge
6e)st#oo)%e st#ain gauge
6wi#e D(A
soo#teli%)e wee#stand EmG
D lengte *an de d#aad EmGA doo#snede Em2G
*a#iee#t ,e# metaalsoo#t
!unne d#aden 29 Hm wo#den ge#ui)t om)leine lengte *e#ande#ingen te meten nm
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8C120 - 201
6esisti*e senso#s – Jheatstone #idge
6esisti*e senso#s ,#oduce#en *aa) )leine *e#ande#ingen in
wee#stand
$m de+e )leine *e#ande#ingen te detecte#en ge#ui)t men *aa) de
+gn. #ug *an Jheatstone +ie BK2 o,g L
61 is de senso#. e#schil inwee#stand wo#dt gemeten doo#
s,annings*e#schil te meten tussenA en B
@at
6 1
6 8 6 7
6 2
A B
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8C120 - 201
6esisti*e senso#s - otentiomete#otentiomete#
@
6 A
i
5
1i
@
6i
5
1i
R +
R 7
Positie Ci /epaalt de erhouding tussen R + en R 7
&leine Ci /ete9ent grote R + en 9leine R 7De erhouding R +:R 7 /epaalt de uitgang 5
Op deze manier 9an de potentiometer positie Ci /epalen
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8C120 - 201F#om" htt,"((www.eng.cam.ac.u)(!esign$Nce(md,(elect#icOwe(!C(!CO>.html
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8C120 - 201
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8C120 - 201
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8C120 - 201
Figure 2.2 (a) Unbonded strain-gage pressure sensor. The diaphragm is directly coupled by
an armature to an unbonded strain-gage system. With increasing pressure, the strain on gagepair B and C is increased, hile that on gage pair ! and " is decreased, (b) Wheatstone
bridge ith #our acti$e elements. R % & B, R 2 & !, R ' & ", and R & C hen the unbonded
strain gage is connected #or translational motion. esistor Ry and potentiometer Rx are used
to initially balance the bridge, vi is the applied $oltage and "v o is the output $oltage on a
$oltmeter or similar de$ice ith an internal resistance o# Ri .
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Figu#e 2.9 Isolation in a dis,osale lood-,#essu#e senso#. !is,osale lood ,#essu#esenso#s a#e made o' clea# ,lastic so ai# ules a#e easily seen. &aline Pows '#om an
int#a*enous I ag th#ough the clea# I tuing and the senso# to the ,atient. This Pusheslood out o' the ti, o' the indwelling cathete# to ,#e*ent clotting. A le*e# can o,en o# closethe Push *al*e. The silicon chi, has a silicon dia,h#agm with a 'ou#-#esisto# Jheatstone#idge diQused into it. Its elect#ical connections a#e ,#otected '#om the saline y acom,liant silicone elastome# gel; which also ,#o*ides elect#ical isolation. This ,#e*entselect#ic shoc) '#om the senso# to the ,atient and ,#e*ents dest#ucti*e cu##ents du#ingde5#illation '#om the atient to the silicon chi .
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8C120 - 201
!is,osale and wea#alood ,#essu#e senso#s
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8C120 - 201
Ca,aciti*e senso#s
Ca,aciti*e senso#s"
?et o%ect dat gemeten wo#dt )an de ca,aciteit *an een
,laatcondensato# *e#ande#en
e#ande#ing in ca,aciteit wo#dt o.a gemeten m..* #ugci#cuit
5
' +)r
n AC
d ε ε
−
=
ε0 ,e#mitti*ity *#i%e #uimte 8.89 10-11
F(mε# #elatie*e ,e#mitti*ity
n aantal ,latenA o,,e#*la) ,laat Em2Gd a'stand tussen ,laten EmG
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8C120 - 201
Ca,aciti*e senso#s
oo#eelden1. Ca,acitance mic#o,hone" #uimte tussen twee
,a#allelle ,laten wo#dt eRn*loed doo#
a)oustische d#u)
2. Ca,aciti*e le*el indicato#" het ni*eau *an een
*loeisto' tussen twee ,a#allelle ,laten e,aalt
de ca,aciteit
7. Ca,aciti*e dis,lacement indicato#" *e#,laatsing
*an een *an de ,laten leidt tot *e#ande#ing in
ca,aciteit
motion
le*el
motion
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8C120 - 201
Ca,aciti*e
senso#s
?et te)en *an @ wo#dt e,aald doo# ewegings#ichting 0
&nelle eweging g#ote st#omen hoge s,anning @
Dang+ame eweging
)leine st#omen
lage s,anning @
acte eigenscha,,en meetsysteem a'han)eli%) *an 6 en wee#stands,anningmete#
i
C
6
⊥
u
0
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8C120 - 201
Figu#e 2.> Ca,acitance senso# 'o#measu#ing dynamic dis,lacement changes.
&ensiti*ity"
MMA
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8C120 - 201
Figu#e 2.12 a ?igh-'#eUuency ci#cuit model 'o# ,ie+oelect#ic senso#. Rs is the senso#lea)age #esistance and Cs the ca,acitance. Lm; Cm; and Rm #e,#esent the mechanicalsystem; ie+oelect#ic senso# '#eUuency #es,onse. F#om Transducers for BiomedicalMeasurements: Principles and Applications; y 6. &. C. Coold. Co,y#ight c 1>L; VohnJiley and &ons; Inc. 6e,#inted y ,e#mission o' Vohn Jiley and &ons; Inc.
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Inducti*e senso#s
oo#eeld" *e#,laatsing *an magneet)e#n in de s,oel *e#ande#t 3 endus de self)inductance 5g a o' demutual inductance 5g
Mee# 'e##ic i%+e#-achtig mate#iaal in de s,oel *e#hoogt D Toe,assing" D!T – Dinea# a#iale !iQe#ential T#ans'o#me# 5g c
oo#deel *an dit ty,e senso#" geen mechanische sli%tage
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8C120 - 201
T#ansduce#s -the#mocou,le&el' gene#ating t#ansduce#s
oo#eeld 1" the#mo)o,,elen )lein s,annings*e#schil the#mionic ontstaat wannee# twee
d#aden *an *e#schillend metaal aan een uiteinde met el)aa#wo#den *e#onden
&,annings*e#schil is ,#o,o#tioneel ge#elatee#d aan tem,e#atuu#&eeec) eQect
Als eide uiteinden *e#schillende tem,e#atuu# heen +i%ns,annings*e#schillen aan eide uiteinden *e#schillend
Als eide uiteinden *e#onden +i%n *ia een ci#cuit ontstaat st#oomXg#ootte *an de+e st#oom is a'han)eli%) *an tem,e#atuu#*e#schiltussen de twee uiteinden
&enso# uiteinde wo#dt YhotZ genoemd
6e'e#entie uiteinde wo#dt YcoldZ genoemd
Tem,e#atuu# #e'e#entie li%'t constant i%*. smeltend i%s
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T#ansduce#s - the#mocou,le
The#mo)o,,el"
3e#ui) the#mo)o,,els om tem,e#atuu# te meten
?et tem,e#atuu#*e#schil tussen V1 en V2(V7 wo#dt gemeten. V2 en V7
wo#den o, een )onstante tem,e#atuu# gehouden.
Metal A
Metal B
V1 T1
V2 T2
V1 T1
Metal A
Metal B
o
V2
V7
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T#ansduce#s - the#mocou,le
0 [ \ T1 – T2
!e metalen wo#den e,aald doo# het tem,e#atuu#e#ei)"i%+e# *e#sus )o,e#-ni))el" 0 oC tot L90 oC)o,e#s *e#sus )o,e#-ni))el" -200 oC tot 700 oC
Men neemt aan dat the#mo)o,,els een lineai#e ge*oeligheidsensiti*ity heen; i%*. 98.9 (oC &eeec) co]Ncient
Als sensiti*ity e)end is; dan is s,annings*e#schil een maat
*oo# de tem,e#atuu# onde# *oo#waa#de dat#e'e#entietem,e#atuu# e)end is
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8C120 - 201www0introtoccnursing0com.thermodilution0h
Thermo-dilution)
Measuring #lood flow #ythermal dilution
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T#ansduce#s – ,ie+oelect#icc#ystal
oo#eeld 2"
,ie+oelect#ic c#ystal
4#istalst#uctuu# wo#dt *e#stoo#d i%mechanische #e)
!it leidt tot #elatie*e *e#,laatsing *an,ositie*e en negatie*e ladingen ins,eciale ,ie+o )#istallen
!it leidt tot ele)t#ische lading aan detegeno*e#liggende +i%den *an het )#istal
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T#ansduce#s – ,ie+oelect#ic c#ystal
Dading is ge#elatee#d aan )#acht F
S )F
) EC(:G ,ie+oelect#ic constant *oo# )#istal
!e tegeno*e#liggende +i%den 'unge#en als ca,acitancemet een s,annings*e#schil
S(C )F(^0^#A
a'stand tussen tegeno*e#liggende +i%denA o,,e#*la) *an het )#istal
^# #elati*e di-elect#ische )onstante *an het )#istal
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T#ansduce#s – ,ie+oelect#ic c#ystal
igenscha,,en"
&,annings*e#schillen in m e#ei); a'han)eli%) *an)onstante )
Alleen toe,asaa# wannee# mechanische s,anning snel*e#ande#t" lang+ame *e#ande#ing in mechanisches,anning leidt niet tot lading in het )#istal
Jo#dt *aa) ge#ui)t *oo# meting *an ha#ttoon hea#tsound en 'ysiologische *e#,laatsingen
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T#ansduce#s – ,ie+oelect#ic c#ystal
Toe,assing" ult#ageluid ult#a sound; echo(!o,,le#
&,annings*e#schil o*e# )#istal leidt tot *e#,laatsing
Met de %uiste mate#ialen )an een ult#ageluidgol' mete,aalde '#eUuentie wo#den gegene#ee#d
3eluidgol' wo#dt ge#ePectee#d doo# ewegende loedcellenF#eUuentie *an ge#ePectee#de geluidgol' is ge#elatee#d aan
eweging *anwege !o,,le# eQect
3e#ePectee#de gol' *e#oo#+aa)t s,annings*e#schil o*e# het)#istal
&,annings*e#schil waa#genomen en de '#eUuentie isge#elatee#d aan de st#oomsnelheid *an het loed
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T#ansduce#s – ,ie+oelect#ic c#ystal
@lt#asound *oo# het meten *an wee'sel"
anwege de eindige snelheid *an het geluid; wo#denult#ageluidgol*en doo# *e#schillende geieden o,*e#schillende ti%den te#ugge)aatst
!ie,te a'stand tot ,#oe is ge#elatee#d aan hetti%d*e#schil tussen +enden en ont*angen
Am,litude *an de ont*angen gol' is ge#elatee#d aan dewee'selsamenstelling
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&enso#s en T#ansduce#s
Besch#i%*ing *an de domeinen niet *olledig"
Chemisch domein niet ehandeld
lect#omagnetisch domein niet ehandeld
# estaan oo) senso#en in de+e domeinen"
*on sensor ,?; C$2 o' $2" +et ion concent#atie
om naa# ele)t#isch signaal
P$otomulti+liers" +et licht om naa# ele)t#isch
signaal ,hotoemissi*e senso#s; +ie #eade# 2
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&enso#s en T#ansduce#s -selection
&electie *an senso#en(t#ansduce#s o, asis *an onde#staande
eigenscha,,en"
Ran,e" meete#ei)
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8/18/2019 8C120 College 06 Sensors and Transducers.ppt
http://slidepdf.com/reader/full/8c120-college-06-sensors-and-transducersppt 56/57
8C120 - 201
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8/18/2019 8C120 College 06 Sensors and Transducers.ppt
http://slidepdf.com/reader/full/8c120-college-06-sensors-and-transducersppt 57/57
8C120 - 201
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