ASSESSMENT OF SYNCHRONIC DETECTION AT LOW FREQUENCIES THROUGH DSP-BASED BOARD AND PC SOUND CARD
Mateusz Kotarski, Janusz Smulko
Abstract:
The lock-in amplifier, working at acoustic frequency range, can be cheaply realized by applying a sound card or a board kit with a digital signal processor, together with a low noise amplifier. Such realization can automatically retune frequency and can perform fast measurements at various frequencies to establish frequency characteristic of the investigated, and often time-varying, object. Quality of these two economical solutions is presented in detail and the possible improvements to limit measurement errors are discussed as well.
Keywords:
lock-in amplifier, noise, accuracy
Download:
IMEKO-WC-2009-TC4-291.pdf
DOI:
-
Event details
Event name:
XIX IMEKO World Congress
Title:

Fundamental and Applied Metrology

Place:
Lisbon, PORTUGAL
Time:
06 September 2009 - 11 September 2009
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