ELECTRIC FIELD SENSOR (D.)

FREE FIELD

 

MODELS AD-20, AD-40, AD-55, AD-70, AD-80 & AD-100

PRODYN's AD Model electric field D-Dots are small to medium, free-space, high frequency sensors that measure time rate of change of electric displacement. Being differential, they have two asymptotic sensing elements accurately positioned on opposite sides of a common ground plate and have a radial output direction. Testing has shown the asymptotic design to have less capacitance and higher upper frequency characteristics, compared to the AFWL HSD design.

The equation pertinent to this device is:




            
Vo   =   R  Aeq    
dD/dt





where






   Vo	                   
=
 sensor
output (volts)





   R
                    
=
 sensor
characteristic load impedance (100 ohms)





   Aeq	                  
=
 sensor
equivalent area (m2)






                                                 
®      ®





		   D
                    
=
 magnitude
of electric displacement vector (D =e o   E in Coul/m2)










											



The sensors are passive
devices; therefore, an external power source is not required. The
Model AD-20 39.4 cm output



length can be increased to
1 meter maximum with SMA connectors. Model AD-40 and AD-100 are
equipped with a 100 ohm twinaxial GR connector and with gas
pressurization fittings. Length of output, output style, and
connector type may be modified.






 







    

        SPECIFICATIONS
         
         
         
         
         
         
    

    

        Electrical
        AD-20
        AD-80
        AD-70
        AD-55
        AD-40
        AD-100
    

    

        Equivalent
        Area (Aeq)
        1 x 10-4m2
        3 x 10-4
        1 x 10-3m2
        3 x 10-3
        1 x 10-2m2
        1 x 10-1m2
    

    

        Freq. Resp.(3 db pt.)
        >10
        GHz
        >5.5
        GHz
        >3.5
        GHz
        >2
        GHz
        >1
        GHz
        >350
        MHz
    

    

        Risetime
        (tr 10-90)
        <.029
        ns
        <.064
        ns
        <.11
        ns
        <.17
        ns
        <.29
        ns
        <1.1
        ns
    

    

        Maximum
        output (peak)
        +
        
        150 V
        +
        
        1 kV
        +
        
        1 kV
        +
        
        1.5 kV
        +
        
        4 kV
        +
        
        5 kV
    

    

        Output connector(s)
        SMA(Male)
        SMA(Male)
        SMA(Male)
        SMA(Male)
        GR-TCC*
        GR-TCC*
    

    

         
         
         
         
         
         
         
    

    

        Physical
         
         
         
         
         
         
    

    

         
         
         
         
         
         
         
    

    

        Mass
        40g
        260g
        340g
        448g
        782g
        2.8kg
    

    

        Dimensions
        A (cm)
        39.40
        17.78
        38.58
        36.35
        47.50
        61.60
    

    

        B
        2.54
        5.08
        7.60
        10.16
        14.00
        28.26
    

    

        C
        1.09
        1.95
        3.31
        5.66
        10.00
        31.12
    

    

        D
        0.16
        0.32
        0.32
        0.48
        0.51
        0.64
    

    

         
         
         
         
         
         
         
    





* OTHER CONNECTOR TYPES ARE
AVAILABLE






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