Near-infrared imaging system for detecting small organic foreign substances in foods

Hiroto Tashima; Tsuneaki Genta; Yuya Ishii; Takeshi Ishiyama; Shinichi Arai; Mitsuo Fukuda

doi:10.1117/12.2023541

25 September 2013 Near-infrared imaging system for detecting small organic foreign substances in foods

Hiroto Tashima, Tsuneaki Genta, Yuya Ishii, Takeshi Ishiyama, Shinichi Arai, Mitsuo Fukuda

Proceedings Volume 8841, Current Developments in Lens Design and Optical Engineering XIV; 884117 (2013) https://doi.org/10.1117/12.2023541
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Contamination of foodstuffs with foreign substances is a serious problem because it often has negative effects on consumer health. However, detection of small organic substances in foods can be difficult because they are undetectable with traditional inspection apparatus. In this work, we developed new equipment that can detect small organic contaminant substances in food at high speed using a near-infrared (NIR) imaging technique. The absorption spectra of various foods were measured, and the spectra showed low absorbance at wavelengths from 600 nm to 1150 nm. Based on the observable wavelength range of a CMOS camera, which has a high dynamic range, superluminescent diodes (SLDs) with a wavelength of 830 nm were selected as light sources. We arranged 40 SLDs on a flat panel and placed a diffusion panel over them. As a result, uniformly distributed light with an intensity of 0.26 mW/cm² illuminated an area of 6.0 cm × 6.0 cm. Insects (3 mm wide) and hairs (0.1 mm in diameter) were embedded in stacked ham slices and in chocolate, with a total thickness of 5 mm in each case, and the transmission images were observed. Both insects and hairs were clearly observed as dark shadows with high contrast. We also compensated the images by using software developed in this study to eliminate low spatial frequency components in the images and improve the sharpness and contrast. As a result, the foreign substances were more clearly distinguished in the 5-mm-thick ham.

Citation Download Citation

Hiroto Tashima, Tsuneaki Genta, Yuya Ishii, Takeshi Ishiyama, Shinichi Arai, and Mitsuo Fukuda "Near-infrared imaging system for detecting small organic foreign substances in foods", Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 884117 (25 September 2013); https://doi.org/10.1117/12.2023541

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Near infrared

Spatial frequencies

Light scattering

Scattering

Absorption

Imaging systems

Sensors

Show All Keywords

Keywords/Phrases

Search In:

Publication Years