Applied Geophysics : Seismics
Seismometer-Galvanometer Coupling
Applet
( in separate window, approx. 320 x 460 Pixel )
- The applet shows in separate windows
- a schematic diagram of the coupling network, and
- an interactive graphic display of normalized coupling
parameters,
- and allows
- to set relevant seismometer and galvanometer parameters in a
dialogue area
- and
- to adjust the coupling network in the graphic display.
( Background : see
Seismometer-Galvanometer Documentaion, in separate window )
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Applet Dialogue :
( Screenshot )
- COUPLING DIAGRAM SHOW
- shows / hides a schematic diagram of the coupling network.
- ADJUST RESISTANCE - T SHOW
- shows / hides a graphic display of normalized coupling
parameters.
- NO INSTR / USER PAR / KIRNOS
- controls the parameter dialogue and
- the parameter adjustment in the graphic display window.
- NO INSTR disables the parameter dialogue and allows
the adjustment of all normalized parameters in the graphic display.
- USER PAR and KIRNOS enable the parameter
dialogue and inhibit the adjustment of the normalized
parameters in the graphic display ( q_σ only is
adjustable ).
- INF and HLP display
- informations to the actual cursor position ( INF )
- and / or
- hints to actually possible mouse actions ( HLP )
- in the graphic display window.
Parameter Dialogue :
( Screenshots )
Example USER PAR
- The screeshot shows the min. set of parameters, i.e.
- coil and damping resistances of both instruments,
Rc_s / g and Rd_s / g,
- while the instrument parameters CDR, α0
and α are unused.
- If CDR, α0 and α are set to compatible
values,
- α_max ( max. possible damping ) and Rd
( damping resistance ) are calculated and displayed.
- ( Incompatible prameter values result in error messages in the field
ERR: )
- If the parameters of both instruments ( seismometer and
galvanometer ) are set
- σ_max ( max. possible coupling coefficient )
is calculated and displayed
( σ_m, > 0, < 1 ).
Example KIRNOS
- The instrument parameters are preset with
- values of a Kirnos seismograph system,
- leading to
- values α_max and Rd for both instruments and the
value σ_max.
- The values Re_s, Re_g, Re_0 and σ^2
- depend on q_σ ( adjustable in the graphic parameter
display, see below ).
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- Screenshots -
Circuit Diagram
( see
Seismometer-Galvanometer Documentation, in seperate window. )
Graphical Display
( Parameter values see dialogue examples above )
Color code :
red = seismometer,
blue = galvanometer,
magenta = Rd_g/Rd_s or Rd_s/Rd_g,
cyan = q_&sigma
- For given normalized parameters Rd_g/Rd_s, Rc_s/Rds
and Rc_g/Rd_g the quotients
- R_s / Rd_s = (Rc_s+Re_s) / Rd_s and
R_g / Rd_g = (Rc_g+Re_g) / Rd_g
- are displayed as functions of
- q_σ = σ / σ_max
- in the range 0 ... 1 for q_σ and both functions.
- Values of q_σ and of both functions outside this range are
meaningless for the coupling problem.
( Details see
Seismometer-Galvanometer Documentation )
- The normalized coil resistances Rc_s/Rd_s and Rc_g/Rd_g
- are displayed as horizontal lines :
- red / blue, where the distance to the resp. functions,
- i.e. the normalized external resistances
- Re_s/Rd_s resp. Re_g/Rd_g, are ≥ 0.
- The range of q_σ, where both resistances
- Re_s and Re_g are ≥ 0
- is marked green,
- denoting the range of q_σ, compatible with the given dampings, i.e.
damping resistances.
- In mode NO INSTR the normalized parameters can be adjusted
at scales :
- Rd_g/Rd_s or Rd_s/Rd_g below
( magenta, 0.01 ... 1 ),
- Rc_s/Rd_s left
( red, 0.01 ... 0.95 ) und
- Rc_g/Rd_g right to the display
( blue, 0.01 ... 0.95 ).
- For USER PAR and KIRNOS these paramters
- are set in the parameter dialogue of the applet.
- The value of q_σ can be adjusted in all three modes
at the scale above the display.
- Parameter scales :
- left mouse button -> drag,
- right button -> set value,
- lower left edge :
- left mouse button -> scale = Rd_g/Rd_s,
- right button -> scale = Rd_s/Rd_g.
- In a text area at the upper edge of the display window
- the first line lists the values of the normalized parameters,
- and below
- the actual value of q_σ and the resulting
normalized coupling resistances are displayed.
Example NO INSTR
( Parameter values : preset at start of the applet )
Example USER PAR
( Parameter values : preset at start of the applet )
Example KIRNOS
( Parameter values : preset selecting KIRNOS )
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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
Rev. 12-nov-2012
Comments to
Fritz Keller
( ned gschempfd isch globd gnueg )
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