Cảm biến - Khái niệm cảm biến tiệm cận - cảm biến điện dung

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    18-Jul-2015

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  • CAM BIEN TIEM CAN

    Proximity Sensors1

    Do khong tiep xuc vi c cau chap hanh nen

    tuoi tho cao.

    Phat hien v tr chnh xac.

    Thi gian ap ng nhanh

    Tnh nang chong ao cc

    uu iemiem cuacua camcam bienbien tiemtiem cancan

    CAM BIEN IEN T

    (Inductive Sensors)

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    Tnh nang chong ao cc

    Led hien th trang thai Out

    at tieu chuan IP67 ( tieu chuan IEC )

    CAM BIEN IEN DUNG

    (Capacitive Sensors)

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  • Cam bien ien t c cau tao da tren

    nguyen ly mach dao ong LC va s tieu tan

    nang lng ien t khi co kim loai at vao

    vung ien t cua cam bien.

    Khi co mot manh kim loai c at vao

    vung ien t cua mach LC, tren kim loai se

    1. 1. NguyenNguyen lyly camcam bienbien ienien tt

    LC

    CAM BIEN IEN T

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    tao ra dong quan. Dong nay tao ra mot

    trng ien t chong lai trng ien t sinh

    ra no, va lam giam nang lng cua trng

    ien t nguon.

    +

    -

    LC

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  • Dung e phat hien kim loai

    ien ap hoat ong: 12 ~ 24 VDC hoac 90 ~ 240VAC

    Khoang cach lam viec: 1.5 ~ 40mm

    Dong ien tai Max.: 200mA

    Nhiet o lam viec : -25 C 70 C

    2. 2. acac tnhtnh kyky thuatthuat camcam bienbien ienien tt

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    Nhiet o lam viec : -25 C 70 C

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  • Cam bien ien t c cau tao da tren

    s thay oi ien dung cua dao ong RC khi

    tep can vat the.

    Khi co vat the i vao ng ien dung

    1. 1. NguyenNguyen lyly camcam bienbien ienien dungdung

    CAM BIEN IEN DUNG

    R2

    C2

    R1 R3

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    gia 2 ban cc, ien dung C cua tu ien se

    thay oi. Cam bien se phat hien s thay oi

    nay e phat tn hieu ngo ra cua cam bien.

    C1 R4

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  • Nhan biet c hau het cac vat the

    ien ap hoat ong: 12 ~ 24 VDC hoac 90 ~ 240VAC

    Khoang cach lam viec: 5 ~ 20mm

    Dong ien tai Max.: 200mA

    Nhiet o lam viec : -25 C 70 C

    2. 2. acac tnhtnh kyky thuatthuat camcam bienbien ienien dungdung

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    Nhiet o lam viec : -25 C 70 C

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  • +V

    Ng ra iu khin

    Mch inemitter

    Ng ra PNPNg ra NPN

    TTTTiiii+V

    Ng ra iu khin

    collector

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    TTTTiiii

    0V

    collector

    PNP Transistor0V

    iu khin

    Mchin

    emitter

    NPN Transistor

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