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TRNG I HC BCH KHOA H NI VIN IN T - VIN THNG
R&D lab phng 618, Th vin T Quang Bu
SINH VIN NGHIN CU KHOA HC
Tn ti: Cm bin phng x
GVHD : TS Nguyn Hu Pht
SVTH : Nguyn Vn Giang
Nhm : Sensor
Lp: TTT 7 K56
h ni, 25/11/2013
1
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Bo co tm hiu:
C bn v cm bin phng x.
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C bn v cm bin phng x.
a. Nguyn l hot ng: - Hot ng da trn s cm ng xung phng x, khi t
trong mi trng c nng phng x, cm bin s o s xung phng x trn 1 n v thi
gian nh cpm( clock per minute ) hay cps ( clock per second). Sau
nhn gi tr ny vi gi tr quy i s ra c liu lng phng x. n v liu lng phng
x l Sv/h ( Sievert / hour ).
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b. Mt s cm bin phng x. LND 712
- c tnh: + H s quy i: 0,00233 + Sai s m xung: ~1,7% + V lm bng
thp khng g, ca s mica. + Nhit hot ng: -40oC n 75oC. + in p m: 325 V
+ in p hot ng: 450V n 650V. (thng dng 500V)
+ Cn b chuyn i ADC chuyn i s xung nhn c thnh gi tr s a ra khi
hin th.
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-u im: Pht hin c c 3 loi phng x, phm vi hot ng rng. -Nhc im: Gi
thnh cao: 90$ ; in p hot ng ln
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SBT 9
- c tnh: + in p m = 260-320 V + in p lm vic = 380 V + Nhit lm
vic -45...+50 OC + Tui th: 1*1010 pulses + Nng: 8,3g + Di: 73mm
- u im: Gi thnh thp ~32$ - Nhc im: Khng pht hin c phng x
anpha
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SBM-20 U
- c tnh. + H s quy i 0,00277 + Sai s m xung ~1.7% + V nhm. +
Nhit hot ng: -60oC n 70oC. + in p m : 260 320 V + in p hot ng: 350V
n 475V (thng dng 400V).
+ Tui th: 2.10^10 chu k xung.
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- u im: Gi thnh thp ~ 21$ - Nhc im: in p lm vic v in p m cao,
khng pht hin c phng x anpha.
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Photo diode Bpw 34
Kch thc ca bpw34
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c tnh k thut:
u im: - Din tch mt nhn sng rng ( 7,5 mm2) - Gc m rng ( +- 65 ) -
nhy sng cao - p ng nhanh - n nh cao khi nhit xung quanh thay i -
Pht hin phng x da trn bc sng bc x ti b mt - ng gi trong ng - Nhy cm
vi bc sng t 400nm-1100nm, max l 850nm
.
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T hai hnh trn c th thy bpw rt tuyn tnh v n nh, c dng ra tuyn
tinh vi cng nh sng v n nh vi nhit thay i. ng dng rng ri trong thng
thoi hng ngoi v cc b cm bin nh sng
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Nguyn l hot ng: nhy tuy khng bng cc ng Gerd-Muller nhng mch d lp
t v thit k bn cnh l gi thnh thp. Khi c bc x chiu vo photo diode s
sinh ra dng in, dng sau c khyuch i v so snh qua cc khuych i thut
ton phn bit c tn hiu v nhiu.
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S nguyn l mch cm bin s dng BPW34
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Kt ni vi BPW34
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Thit k ng d dng BPW34
Bc v nhm m bo s cch li vi nh sng v s nhn bit phng x nh hng
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a ch mua BPW 34
http://jp.rs-online.com/web/p/product/247240/?cm_mmc=JP-PPC-0411-_-google-
_-3_EEM_MPN_SEMIS_PP-_-bpw+34_Phrase
http://jp.rs-online.com/web/qa/quickorder/
Video tham kho: http://www.youtube.com/watch?v=vjMtOGlCmmU
