Desenvolvimento de protótipo de dosímetro para obtenção e análise de dados de intensidade sonora

Abstract

Given the high number of auditory injuries caused in industrial environments, it is noteworthy the difficulty in measuring and understanding to what extent hearing protection equipment is effective and whether there is negligence on the part of the user during working hours. The equipment used to verify sound attenuation in era protectors is the digital dosimeter, a highpriced device that employs MIRE (Microphone in Real Ear) technology. Thus, the construction of a dosimeter prototype is proposed using two microphones, one outside and one inside an era protector, aiming to assess the effectiveness of its sound attenuation and determine if the equipment in question is capable of protecting the user’s hearing. The processing of the signals sent by the microphones, through the I²S protocol, is performed in a microcontroller, which, in turn, exports the obtained values to a .wav file for future analysis and visualization using a MATLAB routine. When the outputs of the routine are observed, it can be easily evalutated if the sound attenuation matches the expected values during the recording period in terms of dB and Hz.