In some fruits and vegetables, it is difficult to visually identify the ones which are pest infested. This particular aspect is important for quarantine and commercial operations. In this article, we propose to present the results of a novel technique using thermal imaging camera to detect the nature and extent of pest damage in fruits and vegetables, besides indicating the level of maturity and often the presence of the pest. Our key idea relies on the fact that there is a difference in the heat capacity of normal and damaged ones and also observed the change in surface temperature over time that is slower in damaged ones. This paper presents the concept of non-destructive evaluation using thermal imaging technique for identifying pest damage levels of fruits and vegetables based on investigations carried out on random samples collected from a local market.
The demand for highly sensitive and reliable sensors to assess the refractive index of liquid get many applications in
chemical and biomedical areas. Indeed, the physical parameters such as concentration, pressure and density, etc., can be
found using the refractive index of liquid. In contrast to the conventional refractometer for measurement, optical fiber
sensor has several advantages like remote sensing, small in size, low cost, immune to EMI etc., In this paper we have
discussed determination of refractive index of sugar solution using optical fiber. An intensity modulated low cost plastic
fiber optic refractive index sensor has been designed for the study. The sensor is based on principle of change in angle
of reflected light caused by refractive index change of the medium surrounding the fiber. The experimental results
obtained for the sugar solution of different refractive indices prove that the fiber optic sensor is cable of measuring the
refractive indices as well as the concentrations.
This paper describes the work of some SPIE student chapter members to create interest in students on optics by teaching students in upper primary schools in and around college premises on fundamental concepts of light such as reflection, refraction, diffraction, etc. This paper discusses about how the outcome based education (OBE) is helpful in learning optics interesting rather than the traditional way of learning. In order to achieve this, students are divided into groups and conducted a workshop. Student learning outcomes were assessed at the end of the program. The program is useful to us to improve our understanding of how students learn light - related principles and provide evidence of the learning outcomes on the subject. Our research established that students in every classroom learned optics concepts, uncovered student ideas about optics, and identified ways to support and supplement the curriculum for use in classrooms.
The broad objective of this paper is to study the surface of the corroded metals by using proximity sensor which works
on the principle of light scattering by objects. The present work discussed a simple low cost sensor design making use
of plastic optical fiber. The sensor used is insensitive to source fluctuation and can detect surface roughness of the
metals. The average surface roughness of the samples in different concentrations of acidic medium has been studied
using the sensor. The reflected light intensity from the surface of sample metals was collected and measured as a
function of lateral distance to estimate the roughness of the surface. The results have been compared with the stylus
measurements.
The paper presents a proximity sensor based on plastic optical fiber as tilt sensor. Discrete and continuous response of
the sensor against change in tilt angle of the setup is studied. The sensor can detect tilt angles up to 5.70 and the achieved
sensor sensitivity is 97mV/0 .
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