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					                      (Velocity Transducer )


                                               )
                                  (electromagnetic linear)




             d
     V= -N      
             dt




     V = adt + V 0



     (V0)



1.
2.
                                                                      (dc
electromagnetic tachometer)




20
                                                           5%   FSO



                                         F




(




        1.                    /                     rpm)
        2.
        3.          (             mv per r / min)
                                                  )



                                (offset shift )




ac permanent – magnet




                                                      OS




                        5



                            )




TTL
     (reflective tape ) (




                            (Accelerometer)




1.
         2.




(cantilever spring)
         3.
reluctance)




                                           ‚
         ‛




        4.               (Piezoelectric)




(phonograph cartridge)
          q = DE

     F=
     D=




     e = q/c

     e = DF/C




1.                 (palarization )

2.
3.
(
                                            10 kHz




    5.                 (Strain Gauge)
                                   ‚    ‛




    1.



                    F = (p2 – p1)A



                            ,m2
         p1, p2 =       , N /m2
2.




3.   (Integrated Package)




                            10 k



                                   -
                                                     7100



                  1             2             3         4
                                +v out        vs        - v out



                                  2)

(                 p1)

    1. 1.0 kpa (kilo Pascal)             0.145 psi
    2.

    3. full scale span (VFSS)
      4.        (V off )
      5.                                                10 %
           %



                       (Application Information)
                                                         p1

(surface die)
> p2                                               p1
     1.   F
)




2.            (Simple Pressure Sensors A mplifier)

                                      %
                   +1.5%                   - 5
                        (Flow Sensors)



                           (solid Flow Measurement)



                            (liquid host)
                                            ‚     ‛



                        (Liquid Flow)




          1.
                                                                  gallon / min , m3 / hr,
ft3/hr
          2.
                                                                   m/min , ft/min

                                            Q
                                     v=
                                            A

                        Q =
                        A=
                    (                               )
          3.                        (mass or weight flow rate )

lb/hr ,                                         F = Pq
               F=              หล
               P=
               Q=
                                                  (Reynolds number)

                                            vdp
                                  NR =
                                             u



    V =
     D=
      =

    NR < 2000



    (Restriction Flow or Differential Pressure)




(




                         Q = K  P

            K=
            P =
square root extractor

(restrictors)



                        (
                            )
                               (p)
(square root extractor )



                                      (concentric)




1.

2.        (meter tube)

3.                         (

4.




     ‘’   ’’
                         p2
p1     v1                         v 2
     +    + z1 - h1 =         +       +z2
       2g                         2g

                     Q = A1 V2 = A2V 2
                     (

          2g ( p 1  p 2) / g
v2 = c
          1  ( A 1  A 2)


       c=
      =

                2g ( p 1  p 2) / g
     Q = CA 2
                1  ( A 1  A 2)
          Pitot




                                      ‚                ‛    ‚        ‛




                    p1                    P            VS
                         + z1 + -h L =        + zs +
                                                       2g
                  v s = 0 , z1 = z2                             =0



                      P1/  + V1 2 / 2g = ps/

p1 /  =
PS =
PS /  =
V1 2 / 2g =
Dwyer Instrument Inc.)
v1 =   2g ( ps  p 1) / 
7.42

                                           s:
P1 – X + Y + gh - h – y + x = ps

ps – p1 = gh - h = h(g- )
                                v1 = 2gh ( g ) / 




                                                  Q =AV




50 %                                                      5–
10 %
       – 5%-




         S E




               S E
                C
  c = 0.9975 - 0.00653 (106 / NR)a
     5
a = 0.2

				
DOCUMENT INFO
Jun Wang Jun Wang Dr
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