Applet    ( in separate window, ca. 420 x 410 Pixel )

The applet displays amplitude and phase of the normalized frequency response of

a displacement transducer ( DSP_OUT )

and / or

a velocity transducer ( VEL_OUT )

with respect to

ground displacement, velocity and / or acceleration

for different damping values of the system.

( Background : see Seismometer Documentation )

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Dialogue Window :
( Screenshot )

The Parameters of the response to be displayed are selected in the parameter dialogue ( background light blue ) :

The damping of the seismometer is

selected from ALP= 0.2 ... ALP= 2.0

or

adjusted ( ADJUST ) between 0.001 and 99.999

( DEC / INC, in steps of 10.0 ... 0.001 ).

The output signal of the seismometer is selected from SEISMO OUT :

DSP_OUT = displacement transducer

or

VEL_OUT = velocity transducer.

The type of ground motion the response refers to is selected from RESP. TO... :

DISPLACEMENT

VELOCITY

or

ACCELERATION.

Comparison of response curves :

With DAMPING = 0.2 ... 2.0, the response curves

of one type of output ( SEISMO OUT ) and

for one type of ground motion ( RESP. TO... )

are displayed simultaniously

for five different values of seismometer damping,

with SEISMO OUT = DSP+VEL, the curves

for one damping value ( DAMPING ) and

for one type of ground motion ( RESP. TO... )

are displayed

for both displacement and velocity output,

and with RESP TO... = DSP + VEL + ACC, the curves

for one damping value ( DAMPING ) and

for one type of output ( SEISMO OUT )

are displayed siultaneously

for ground displacement, velocity and acceleration.

CLEAR TEXT ...

clears the text area of the applet,

lists the actually selected transfer functions with 16 values per decade in the range 1.E-3 ... 1.E3 of normalized frequency ( LIST RESP. ),

and

displays the frequency normalization and the fomulae used for calculating the transfer fuctions ( DISP NORM. ).

HIDE ...

shows / hides the graphic display of response curves :

AMPL => amplitude response,

PHAS => phase response,

and

A + P => both.

INFO and HELP refer to the graphic display windows, where

informations to the actual cursor position ( INFO )

and / or

hints to actually possible mouse actions ( HELP )

are displayed.

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Graphic Display :
( Screenshots RESP. TO... = DSP+VEL+ACC )

The frequency scale is normalized to the natural frequency F_0 of the ( undamped ) seismometer
( see screenshot text area, below ).

( Background : see Seismometer Documentation )

Text Area :
( Screenshot DISP NORM. )

Class and html files for a local installation of the applet are available as a zip file and as a tar.gz file.

More applets at : Geophysics Department TU Clausthal

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