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Spectrem 2000
The SPECTREM system
| The Spectrem system is arguably the most advanced AEM
system in existence. |
| The operational philosophy is different to the other
commercially available systems, and centers around having a 100%
duty cycle transmitter, and all measurements of the resultant
secondary field are performed in the presence of the primary,
transmitted field. This is in contrast to the more traditional pulse
type systems where measurements are performed during the off-time
proceeding the transmitted pulse. |
| From a purely theoretical viewpoint, this 'FLYING UTEM'
type AEM system has a number of advantages over pulse systems, in
addition to the more practical aspects of noise reduction as a
consequence of sound electronic design and implementation, and a
philosophy of maintaining a comfortable lead over competitor systems
as a rationale for developing a previously in-house only system. |
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| Fundamental Design Advantages |
| A number of fundamental advantages are inherent to a
square-wave, 100% duty cycle, on-time system. In summary these are
:- |
| � Deconvolution of the
received signal to STEP or ARBITRARY response* |
| � Larger Secondary Field
Response |
| � Longer Measurement Times |
| � Larger transient currents |
| � Response Monotonically
increases with Pulse Width |
| � Significantly increased
bandwidth - early and late time |
| � Removal of equipment
electronic transfer function from |
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| *Deconvolution to Impulse Response |
A requirement of an on-time system is the necessity to
measure exactly what is transmitted in addition to the simultaneous
receiver channels. This requirement, in addition to the minimum
phase nature of a 100% duty cycle, square-wave transmitter allows
the deconvolution of the primary field from the received signals, as
well as the elimination of the electronic transfer function. This
deconvolution allows for the exact computation of the secondary
impulse response. This impulse response may subsequently be
convolved with
- A step waveform (i.e. integrate the impulse response) to
yield the secondary step response (normal operation)
- A cosine to yield an 'input' type response
- Any arbitrary waveform
- Alternatively a frequency domain equivalent result may be
presented.
This flexibility in terms of data presentation is unique |
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