Convertion count to m/sec
Your Question:
Dear IRIS Pascal Instrument Center,
My name is Akhmad Fanani Akbar, I am from Institut Teknologi Bandung. I will do my thesis with focal mechanism topic. And I need some information with Geospace Y-28 (GS11-3D) High Frequency Sensor. Did IRIS Pascal Instrument Center have information about A0 and ratio count --> m/sec about this instrument?
Because I couldn't found it in http://www.geospace.com/ and when I try to contact geospace by email, they never reply my email. I hope you can help me to solve my problem.
Thank you,
Best regard,
Akhmad Fanani Akbar
Geophysical Engineering
Institut Teknologi Bandung
Asker Email:
fanani_akbar@yahoo.co.uk
Category:
Instrumentation
Hello Akhmad. These two pages may help you.
The first is our Sensor Comparison Chart:
http://www.passcal.nmt.edu/content/instrumentation/sensors/sensor-comparison-chart
Here is the information from that page on the Y-28 Sensor:
- Sensor : Y-28-3D
- Manufacturer : Oyo-Geospace
- Power : passive
- Corner Frequency : 4.5 Hz
- Damping : 0.707 critical
- Sensitivity : 32 v/m/s
- Poles and Zeroes : 2 poles, 2 zeros
A second page, "Working with Responses to Get Units of Ground Motion", explains how to get the units of ground motion:
http://www.passcal.nmt.edu/content/instrumentation/field-procedures/working-responses-get-units-displacement
Amplitude(counts) * A/D conversion factor(V/counts)
ground velocity (m/s) = ------------------------------------------------------------
Gain * Sensitivity (V/m/s)
The Sensitivity for the Y-28 is 32 v/m/s. Note that you will have to include a conversion factor for the specific type of DAS used (RT130 versus Q330, for example), and factor in the Gain, etc.
There is more information on the Y-28 here:
and Poles and Zeroes for this sensor are listed here:
Good luck!
Dave Thomas
