Guralp-systems CMG-1T Manual de usuario descargar pdf (Pagina 13)

Operator’s Guide CMG-1T Ocean Bottom

Seismometer

September, 1999, Issue C Section 2,

Page 1

2. DESCRIPTION AND EXPLANATION OF THE MECHANICAL

SENSOR SYSTEM

A photograph of the overall construction and layout of the seismometer are

given here, together with some details of the individual sensors.

The horizontal and vertical sensors are based on a shared design, that of a leaf

spring suspended boom supporting a transducer coil, the boom and coil forming

the inertial mass. The boom consists of a solid machined beam which swings on

a frictionless hinge. The system has no spurious resonances below 140 Hz. The

vertical component instrument has a pre-stressed triangular support spring

which supports the weight of the mass. The horizontal component sensors have

un-stressed flat triangular springs, giving a natural period of about 1 second,

while the vertical component sensor has a natural period of about 0.5 second.

The effective mass is about 250g in each case. The small stiff springs and short

boom lead to a very compact design permitting the designer to incorporate three

instrument in a relatively compact case.

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Guralp-systems CMG-1T Manual de usuario Pagina 13