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TRNG I HC BCH KHOA H NIVIN IN T - VIN THNG

R&D lab phng 618, Th vin T Quang Bu

SINH VIN NGHIN CU KHOA HCTn ti: Cm bin phng x GVHD: TS Nguyn Hu PhtSVTH: Nguyn Vn Giang Nhm : SensorLp: TTT 7 K56h ni, 25/11/2013

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Bo co tm hiu:

C bn v cm bin phng x.

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 ).

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.

4-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

5SBT 9- c tnh:+ in p m = 260-320 V+ in p lm vic = 380 V+ Nhit lm vic -45...+50OC+ Tui th: 1*1010pulses+ Nng: 8,3g+ Di: 73mm- u im: Gi thnh thp ~32$- Nhc im: Khng pht hin c phng x anpha

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.

- u im: Gi thnh thp ~ 21$- Nhc im: in p lm vic v in p m cao, khng pht hin c phng x anpha.

Photo diode Bpw 34

Kch thc ca bpw34

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

.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

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.S nguyn l mch cm bin s dng BPW34

Kt ni vi BPW34

Thit k ng d dng BPW34

Bc v nhm m bo s cch li vi nh sng v s nhn bit phng x nh hnga ch mua BPW 34http://jp.rs-online.com/web/p/product/247240/?cm_mmc=JP-PPC-0411-_-google-_-3_EEM_MPN_SEMIS_PP-_-bpw+34_Phrasehttp://jp.rs-online.com/web/qa/quickorder/Video tham kho:http://www.youtube.com/watch?v=vjMtOGlCmmU