Development of the multispectral UV polarization reflectance imaging system (MUPRIS) for in situ monitoring of the UV protection efficacy of sunscreen on human skin

A cost-effective and low-power-consumption underwater microscopic imaging system was developed to capture high-resolution zooplankton images in real-time. In this work, dark-field imaging was adopted to reduce backscattering and background noise. To produce an accurate illumination, a novel illumination optimization scheme for the light-emitting diode (LED) array was proposed and applied to design a lighting system for the underwater optical imaging of zooplankton. A multiple objective genetic algorithm was utilized to find the best location of the LED array, which resulted in the specific illumination level and most homogeneous irradiance in the target area. The zooplankton imaging system developed with the optimal configuration of LEDs was tested with Daphnia magna under laboratory conditions. The maximal field of view was 16 mm × 13 mm and the optical resolution was 15 μm. The experimental results showed that the imaging system developed could capture high-resolution and high-definition images of Daphnia. Subsequently, Daphnia individuals were accurately segmented and their geometrical characters were measured by using a classical image processing algorithm. This work provides a cost-effective zooplankton measuring system based on an optimization illumination configuration of an LED array, which has a great potential for minimizing the investment and operating costs associated with long-term in situ monitoring of the physiological state and population conditions of zooplankton.

Download Full-text

In situ monitoring of collagen fibers in human skin using a photonic-crystal-fiber-coupled, hand-held, second-harmonic-generation microscope

10.1117/12.2251321 ◽

2017 ◽

Cited By ~ 1

Author(s):

K. Atsuta ◽

Y. Ogura ◽

E. Hase ◽

T. Minamikawa ◽

T. Yasui

Keyword(s):

Photonic Crystal ◽

Second Harmonic Generation ◽

Human Skin ◽

Photonic Crystal Fiber ◽

Harmonic Generation ◽

Second Harmonic ◽

Collagen Fibers ◽

In Situ Monitoring ◽

Crystal Fiber

Download Full-text

Adequate UV Exposures for Healthy Life: In Situ Monitoring and Model Calculation of the Vitamin-D-Synthetic Capacity of Sunlight

Chemistry Journal of Moldova ◽

10.19261/cjm.2012.07(1).16 ◽

2012 ◽

Vol 7 (1) ◽

pp. 98-103

Author(s):

Irina Terenetskaya ◽

Tetiana Orlova ◽

Pavel Kapinos

Keyword(s):

Vitamin D ◽

Human Skin ◽

Direct Calculation ◽

Uv Spectra ◽

In Situ Monitoring ◽

Solar Uv ◽

Vitro Model ◽

Synthetic Capacity

Vitamin D which is formed upon UV solar radiation in human skin is essential in many physiological functions. To estimate beneficial vitamin-D-synthetic capacity of sunlight a bio-equivalent UV dosimeter that is based on the same molecular photochemistry from which vitamin D is photosynthesized in human skin has been developed. The examples of an in situ monitoring of the vitamin-D-synthetic capacity of sunlight using an in vitro model of vitamin D synthesis are presented, and various operational principles of the UV biodosimeter are discussed. In addition, reliable algorithm is presented for direct calculation of previtamin D3 accumulation using the photoreaction mathematical model with solar UV spectra as input data. Critical dependence of previtamin D3 accumulation on cloudiness and aerosols is demonstrated.

Download Full-text

A simple null-field ellipsometric imaging system (NEIS) for in-situ monitoring of EUV-induced deposition on EUV optics

10.1117/12.855967 ◽

2010 ◽

Cited By ~ 5

Author(s):

Rashi Garg ◽

Nadir Faradzhev ◽

Shannon Hill ◽

Lee Richter ◽

P. S. Shaw ◽

...

Keyword(s):

Imaging System ◽

In Situ Monitoring ◽

Null Field

Download Full-text

In situ monitoring of 3D in vitro cell aggregation using an optical imaging system

Biotechnology and Bioengineering ◽

10.1002/bit.21728 ◽

2008 ◽

Vol 100 (1) ◽

pp. 159-167 ◽

Cited By ~ 12

Author(s):

N.B.E. Sawyer ◽

L.K. Worrall ◽

J.A. Crowe ◽

S.L. Waters ◽

K.M. Shakesheff ◽

...

Keyword(s):

Optical Imaging ◽

Imaging System ◽

Cell Aggregation ◽

In Situ Monitoring ◽

Optical Imaging System

Download Full-text

SoilCam: A Fully Automated Minirhizotron using Multispectral Imaging for Root Activity Monitoring

Sensors ◽

10.3390/s20030787 ◽

2020 ◽

Vol 20 (3) ◽

pp. 787

Author(s):

Gazi Rahman ◽

Hanif Sohag ◽

Rakibul Chowdhury ◽

Khan A. Wahid ◽

Anh Dinh ◽

...

Keyword(s):

White Light ◽

Multispectral Imaging ◽

Imaging System ◽

Image Sensor ◽

Motion Blur ◽

Image Resolution ◽

In Situ Monitoring ◽

Geometric Distortion ◽

Entire Area

A minirhizotron is an in situ root imaging system that captures components of root system architecture dynamics over time. Commercial minirhizotrons are expensive, limited to white-light imaging, and often need human intervention. The implementation of a minirhizotron needs to be low cost, automated, and customizable to be effective and widely adopted. We present a newly designed root imaging system called SoilCam that addresses the above mentioned limitations. The imaging system is multi-modal, i.e., it supports both conventional white-light and multispectral imaging, with fully automated operations for long-term in-situ monitoring using wireless control and access. The system is capable of taking 360° images covering the entire area surrounding the tube. The image sensor can be customized depending on the spectral imaging requirements. The maximum achievable image quality of the system is 8 MP (Mega Pixel)/picture, which is equivalent to a 2500 DPI (dots per inch) image resolution. The length of time in the field can be extended with a rechargeable battery and solar panel connectivity. Offline image-processing software, with several image enhancement algorithms to eliminate motion blur and geometric distortion and to reconstruct the 360° panoramic view, is also presented. The system is tested in the field by imaging canola roots to show the performance advantages over commercial systems.

Download Full-text