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This paper evaluates the existing methods for determining ambient PM2.5 concentration, including gravimetric, P-ray absorption and other measurements. A new methodology by measuring the vibration damping changes is proposed. Based on this methodology, a new type of PM2.5 sensor has been developed. The new sensor has a composite structure that consists of an open measuring chamber with a particle size...
Fibre optical sensors (FOS) have been paid a lot of attention because of innate immunity of electro-magnetic interference (EMI) and high precision, especially like Fabry-Perot (F-P) cavity fibre sensor which is tiny and sensitive. However, FOS hasn’t taken place of traditional electric sensors for its complex and expansive demodulation of optical signal. A new demodulation method using white light...
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