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Analysis of sound and acoustics plays a role in such engineering tasks as product design, production test, machine performance, and process control. For instance, product design can require modification of sound level or noise for compliance with standards from ANSI, IEC, and ISO. The work might also involve design fine-tuning to meet market expectations. Here, examples include tweaking an automobile door latching mechanism to impress a consumer with a satisfying click or modifying an exhaust manifold to change the tone of an engine's rumble. Aircraft designers are also using acoustic instrumentation to reduce the noise generated on takeoff and landing. Acoustical measurements and instrumentation range from a handheld sound level meter to a 1000-microphone phased array. Most of the acoustical measurement and instrumentation systems can be broken down into three components: 1) Sensors 2) Data Acquisition 3) Analysis == Sensors == The most common sensor used for acoustic measurement is the microphone. Measurement-grade microphones are different from typical recording-studio microphones because they can provide a detailed calibration for their response and sensitivity. Other sensors include hydrophones for measuring sound in water or accelerometers for measuring vibrations causing sound. The three main groups of microphones are pressure, free-field, and random-incidence, each with their own correction factors for different applications.〔(G.R.A.S. Sound & Vibration ) has a (selection guide ) detailing the difference between microphones.〕 Well-known microphone suppliers include PCB Piezotronics and Brüel & Kjær. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「acoustical measurements and instrumentation」の詳細全文を読む スポンサード リンク
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