Article
Sensing of indoor temperature using acoustic tomography: Optimizing inaccurate loudspeaker and microphone xyz-coordinates (en)
* Presenting author
Abstract:
Acoustic travel-time TOMography (ATOM) is presented as an experimental technique for remote sensing of indoor air temperature. The procedure of ATOM corresponds to collecting the time-of-flight (ToF) of early reflections in room impulse response (RIR), which would then be used as the input data for inverse algorithms to reconstruct the air temperature field. Here, the coordinate errors of the used loudspeaker and microphone have been known to deteriorate measurement accuracy in ATOM systems. To overcome these drawbacks and minimize the measured discrepancy, the idea for adjusting the distance between loudspeaker and microphone can be applied. This idea has been put to work by Dokhanchi et al. [1]. In the present work, we show that such an adjustment is not the only utilizable idea, where a new numerical method can be applied to predict the approximate correct xyz-coordinates of the transceiver. We show that multiple updated coordinates of the transceiver can be recovered from the difference between the calculated and measured speed of the direct ray path. Results show that some of the updated coordinates successfully recover a highly accurate indoor temperature field within an echoic box (1.33 m × 1.0 m × 1.27 m), thus, the feasibility of the proposed numerical method.