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Dual wavelength configurations normally employed to eradicate the effects of variable signal losses in intensity-dependent optical sensors are discussed. Particular attention is paid to the referencing capability of each configuration in relation to the major sources of measurement contamination. Illustrative examples of generic type sensor system implementations are provided and assessed to identify...
LED emission spectra vary significantly with the operating temperature of the device and therefore most intensity-modulated optical fibre sensors employing LEDs as the optical signal source suffer from the associated measurement errors. Although, the advanced types of intensity-modulated sensors will often incorporate thermal stabilisation or a mechanism for reducing these errors, such implementations...
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