SAN PHAM Mdi - CONG NGHE Mdi
su* DUNG IC - 8 0 3 8
T S . NGuyen M a n h T h a o • Trirdng Dai hgc SU pham Ha Ngi
T h S . D o a n V a n Piifc
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ghien cOu ndi dung kien thOe SGK va khao sat cae bp thf nghiem dang dupe sO dyng trong dgy hpe phan giao ddng sdng THPT cho tha'y: phan Idn cac bd thf nghiem deu nhgp ngogi (Indd; My, D O c . v v cua chOdng trinh vat If THPT, da dgt ra cho ehung tdi yeu eau thie't ke, che tgo bd thf nghiem nghien cOu), vdi gia thanh khdng nhd va khi can sOa chOa van edn nhieu van de nan giai.De tranh hgn che d d , chung tdi da thiet ke, che tgo cae bp thf nghiem nghien cOu sdng node, vdi may phat am tan sO dyng IC- 8038. Theo npi dung kien thOc SGK piian Giao ddng sdng, dang sO dyng trong dgy hpe sdng node dam bao dope eac tieu chuan sau:
- Bd thf nghiem giup tgo ra hai ngudn sdng ket hpp, cd tan sd thay ddi tO 20Hz den 20.000Hz va cd bien dp bien ddi to OV den 10V(eua hai ludng khf thdi vao mat thoang cua khay nudc).
- Cae hinh anh eua sdng nude dupc hien rd net, trung thyc tren man eua mdt ta'm kfnh t r l n g md (phocmika).
- Nghien cOu giao thoa sdng cua hai ngudn sdng ket hdp.
- Nghien cOu so phan xg sdng node vdi vat c h i n sdng t h i n g va vat c h i n sdng cong.
- Nghien cOu so nhieu xg sdng node.
- Nghien cOu so khuc xg sdng p h l n g .
- Thiet ke ddn gian, tranh edng kenh va phOe tgp trong nhgn thOe.
DOng trOde yeu e l u dd, dOa tren nguyen vat lieu cd san tren thj trOdng, eung vdi so trd giup cua mdt sd may mdc ddn gian,
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Hinh 1: Sa do mach dien cua may phat im tin, sit dgng IC -8038
chung tdi da thie't ke, che tgo bd thf nghiem nghien cOu sdng nude.
Bd thf nghiem gdm:
- May phat am t i n cd tan sd to 20Hz den 20.000Hz (cd ddng hd hien thi tan sd) va bien dp tO OV den 10V.
- Ddng hd hien thi t i n sd eua may phat am tan (sO dyng ddng hd vgn nang ed thang do tan sd).
- 01 Bp tgo sdng: La mpt khay chOa node, ed day b i n g ta'm thuy tinh p h l n g trong sud't, kfch thodc: 34cm x 47cm x 3em.
- 01 GOdng phan xg cd kfch thodc: 35em x 43em.
- 01 Man nhoa t r l n g md (hoac tam thuy tinh t r l n g dye).
cd kfch thodc: 35cm x 49em.
- 01 den chie'u sang 25W-12V.
- Bd thdi khf: Mdt loa dien ddng 30W, mat loa dope g i n kfn vdi mat kim logi eua vo may phat va ed d'ng thoat khi ra ngoai.
- He thd'ng d'ng d i n khf (dng nhOa), hai d'ng ddng cong cd dodng kfnh trong 1mm de'n 2mm, mdt dng nd'i chO T.
- Bp phan tgo sdng p h l n g , vat e l n p h l n g , vat can cong...
- He thd'ng gia dd va he thdng can b i n g mat phlng ngang cua he.
Cach tie'n hanh thf nghiem
Hinh 2: Anh toin B6 thi nghiem nghiin cufu song nUdc
a- Thf nghiem hien topng giao thoa sdng node:
*) Myc dfch: - Quan sat hinh anh giao thoa sdng node; - Quan sat so thay ddi van giao thoa sdng node khi thay ddi t i n sd va khoang each giOa hai ngudn phat sdng ke't hpp.
*) Bd tri thi nghiem:
- L i p dat he thdng gia dd khay chOa node va can b i n g mat p h l n g ngang cho khay node.
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Sd 51 thang 11 nam 2009SAN PHAM Mdi - CdNG NGHE Mdi
- Dat gUdng phan xg dudi day khay nudc, vdi gdc nghieng 45 dp so vdi mat phlng ngang.
- Do nude sgch vao khay tO 0,7cm de'n 1,0 em (chieu cao cua lupng node trong khay).
- Dieu chinh he thong djnh vj hai dng dong dan khi sao eho vu& du chgm vao mat nodt cua khay.
- Lip den, cho chieu sang vao khay node (hinh: 02).
*) Tie'n hanh thi nghiem:
- Cho may phat am tan hogt dpng vdi tan sd va bien dp nhd nhat.
- Tang d i n tan sd, bien dp khdng ddi, quan sat hien topng giao thoa.
- Tang dan bien dp, tan sd khdng ddi, quan sat hien topng giao thoa.
*) Giai thich ket qua quan sat.
b- Thi nghiem hien topng phan xg sdng
*) Myc dich thf nghiem: - Kiem nghiem djnh luat phan xg eua sdng cP hpc; - Quan sat hien tupng giao thoa cija sdng tdi va sdng phan xg.
*) Bd trf thf nghiem:
- Thay bp phan tgo hai ngudn sdng ket hpp bang bp phan tgo
sdng phang.
*) Tien hanh thf nghiem:
- Cho may phat am tan hogt ddng, quan sat sdng phang.
- Dat vat can phang vao khay nude sao cho vat eln song song vdi mat dau sdng (vudng gdc vdi phUPng truyen sdng).
- Thay ddi t i n sd eua may phat am t i n quan sat hien tupng sdng.
- Thay ddi phUdng cua vat can phang hpp vdi mat dau sdng mdt gdc, thay ddi tan sd cua may phat, quan sat hien tupng sdng.
*) Giai tiich ket qua quan saL c- Thi nghiem hien tupng nhieu xg
*) Myc dfch thf nghiem:
- Kiem nghiem hien tupng nhieu xg cua sdng nUdc.
- Quan sat nhieu xg sdng nUdc.
*) Tien hanh thi nghiem:
- Dgt vat chin phlng song song vdi mat d i u sdng eija sdng tdi (vudng gdc vdi phUPng tmyen sdng).
- Thay ddi dp rdng khe S eua vat chin.
- TrUdng hdp dp rdng khe S = 1mm.
- Tay vat can cd 2 khe SI & S2 cung cd dp rdng la 1 mm.
- Quan sat hien tUghg scng sau khe S (so vd nguon phat song).
- Giai thich hien tupng quan sat.
d- Thi nghiem hien tUpng khuc xg sdng
*) Myc dich thi nghiem: - Kiem nghiem hien tUpng khue xg cua sdng nude, khi truyen qua mat phan each eiJa hai mdi trUdng khac nhau.
*) Tien hanh thi nghiem:
- Dat tam kinh trong sudt cd hinh thang vudng vao khay nude, g i n ngudn phat sdng .
- Do nude vao khay sao eho ngap tren tam kfnh mpt Idp rat mdng.
- Cho may phat hogt dpng - Thay ddi tan sd cua may phat, vdi bien dp eye dgi.
- Xoay tam kinh vdi cae trOdng hpp de gdc tdi i bang khdng dp va Xnidng hpp gdc tdi i khae khdng.
- Giai thii± hien tOgng quan saL Bd thi nghiem cd the phd bien rdng rai tdi cac ta/dng THPT vdi ehi phi thap, de che tgo, cd the thao lap nhanh gpn, ed dp ben vOng, cho thay cae hien topng cua sdng node rat rd rang.B
9 . ^.
Tang cinlng col sii vat chat
(Tiep theo trang 34) cdng cho HS, ludn tgo canhquan mdi trUdng "Xanh-Sgch- e g p " .
- Cd ke hogch kiem tra tai s i n thudng xuyen va djnh ky de kjp thdi tu sOa va trang b|
mdi nhOng dung cu can thidt phyc vy eho dgy hpc.
- Hieu trudng thudng xuyen kiem tra viec q u i n ly va sO dyng TBDH, SGK b i n g each: + Qua bao cao dinh ky hoac ddt xuat cua nhan vien phu trach T B D H ; + Kiem tra so dang ky sO dyng T B D H ; +
Qua du gid len Idp cua GV; + Qua phdng van HS; + Kiem ke tai s i n djnh ky;
3. Dieu kien thOc hien:
SO quan tam dau tU cua UBND tlnh, sd GD&DT, sd Tai chinh ve kinh phf cho viec tang cUdng CSVC-TBDH. SO quan tam cua cac cap lanh dgo, cua cac td chUc xa hdi hd trp nha trUdng ve cac ngudn tai loc, vat lOc, giup tang cudng CSVC-TBDH cua nha trudng theo tinh t h i n xa hdi hda giao due.
De thUc hien dUpc bien phap nay thi khi sO d y n g cac ngudn tai chinh phai cdng khai, minh bgch, dung muc dich, dung che dp chfnh sach va tiet kiem. Hd sd sd sach thu, chi day du rd rang, dung qui dinh chung.
Cac tai san cCia nha trudng p h i i cd sd theo ddi, dinh rd gia trj, danh gia, kiem ke day du, cd ngudi quan ly, mUdn t r i rd rang, qui dinh che dp b i o quan, trach nhiem cho tOng thanh vien.H
