ASSESSMENT OF SYNCHRONIC DETECTION AT LOW FREQUENCIES THROUGH DSP-BASED BOARD AND PC SOUND CARD

• 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:

  _unreg_wc-2009.291

Event details: