Development of a novel spectrometer for tongue coating analyzer based on volume holography transmissive grating

Zhong Ren; Guodong Liu; Longmin Dai; Zhen Huang; Lvming Zeng

doi:10.1117/12.868440

8 November 2010 Development of a novel spectrometer for tongue coating analyzer based on volume holography transmissive grating

Zhong Ren, Guodong Liu, Longmin Dai, Zhen Huang, Lvming Zeng

Author Affiliations +

Proceedings Volume 7845, Optics in Health Care and Biomedical Optics IV; 78451X (2010) https://doi.org/10.1117/12.868440
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

Tongue diagnosis (TD) is an important diagnostic methods in the traditional Chinese medicine (TCM). According to the viewpoint of TCM, the changes of the tongue coating (TC) can reflect the pathological state of the patient. And the nature or severity of diseasec can be determined by observing the TC. Over the years, TD is mostly depended on the subjective experience of the Chinese physician. And the diagnostic results will be impacted by.some factors, e.g. the different light sources or environmental brightness. Recently years, the method of digital image processing has been used into the TD. But its application is limited by the complicated algorithm, time-consuming and big error, etc. Therefore, a novel tongue coating analyzer(TCA) is designed in this paper. Meanwhile, a novel spectrometer for TCA based on the volume holography transmissive (VHT) grating is developed. In this spectrometer, since the VHT grating doesn't produce the stray-light due to the absence of the grooves of classical surface-embossed gratings, the VHT grating is used as the diffraction grating instead of the classical plane or concave grating. Experimental results show that the performances of the spectrometer for TCA have been improved by using the VHT grating, optimizing the light-path structure and software algorithm, etc. Compared with the others, this spectrometer for TCA has many advantages, such as, less diffraction, wider spectrum range, higher efficiency and resolution, etc. The spectrum range of the spectrometer for TCA can reach 300-1000nm, its resolution can reach 1nm and the optical density is larger than 3.

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Zhong Ren, Guodong Liu, Longmin Dai, Zhen Huang, and Lvming Zeng "Development of a novel spectrometer for tongue coating analyzer based on volume holography transmissive grating", Proc. SPIE 7845, Optics in Health Care and Biomedical Optics IV, 78451X (8 November 2010); https://doi.org/10.1117/12.868440

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KEYWORDS

Spectroscopy

Diffraction gratings

Charge-coupled devices

Tongue

Lamps

Signal processing

Coating

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