Contact Microphone

The TSD108A is a contact acoustical transducer. The sensing element is a piezo-electric ceramic disk that’s bonded to the interior of a plastic circular housing. The housing acts to focus intercepted surface pressure waves onto the piezo-electric ceramic disk to enhance both sensitivity and signal to noise ratio.

The TSD108A interfaces with the DA100C general-purpose transducer amplifier to measure a wide array of physiological sounds and pressure waves.

The TSD108A can

• Measure heart sounds or Korotkoff sounds. For heart (including valve) sounds, the TSD108A can be secured to the respective torso location proximal to the source. When the TSD108A signal is recording sounds from the Brachial artery, simultaneously with the TSD120 blood pressure cuff signal, the Korotkoff sounds vividly mark the systolic and diastolic blood pressure.
• Record the sounds associated with rubbing or grinding. (e.g., Bruxism).
• Measure glottal activity and specifically record the production of both voiced and unvoiced sounds. To measure vocal cord behavior, the TSD108A is placed adjacent to the larynx.
• Record the specific acoustical signature associated with the contraction of muscle fibers (place adjacent to striated muscle).

To listen to physiological sounds, as they are recorded, pipe the TSD108A signal through the STM100C Stimulator Module to drive an audio amplifier or pair of headphones.