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Sensors 2009, 9(4), 3109-3121; doi:10.3390/s90403109

A Near-Infrared Spectrometer Based on Novel Grating Light Modulators

1, 2,* , 1, 2
,
1, 2
,
1, 2, 3
,
1, 2 and 1, 2
1
Key Lab of Opto-electronic Technology and Systems, Education Ministry of China, Chongqing, 400044, P.R. China
2
Optoelectronic Engineering Department, Chongqing University, Chongqing, 400044, P.R. China
3
Microsystem Center, Chongqing University, Chongqing, 400044, P.R. China
*
Author to whom correspondence should be addressed.
Received: 24 February 2009 / Revised: 9 April 2009 / Accepted: 20 April 2009 / Published: 24 April 2009
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Abstract

A near-infrared spectrometer based on novel MOEMS grating light modulators is proposed. The spectrum detection method that combines a grating light modulator array with a single near-infrared detector has been applied. Firstly, optics theory has been used to analyze the essential principles of the proposed spectroscopic sensor. Secondly, the grating light modulators have been designed and fabricated by micro-machining technology. Finally, the principles of this spectroscopic sensor have been validated and its key parameters have been tested by experiments. The result shows that the spectral resolution is better than 10 nm, the wavelength deviation is less than 1 nm, the deviation of the intensity of peak wavelength is no more than 0.5%, the driving voltage of grating light modulators array device is below 25 V and the response frequency of it is about 5 kHz. With low cost, satisfactory precision, portability and other advantages, the spectrometer should find potential applications in food safety and quality monitoring, pharmaceutical identification and agriculture product quality classification.
Keywords: MOEMS; Near-infrared; Spectrometer; Grating light modulator MOEMS; Near-infrared; Spectrometer; Grating light modulator
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wei, W.; Huang, S.; Wang, N.; Jin, Z.; Zhang, J.; Chen, W. A Near-Infrared Spectrometer Based on Novel Grating Light Modulators. Sensors 2009, 9, 3109-3121.

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