A low-cost spectrometer to analyse the purity of honey

2021 ◽  
Vol 57 (2) ◽  
pp. 025004
Author(s):  
L F Bestari ◽  
Sarwanto ◽  
Pujayanto ◽  
W P Syam ◽  
D Harjunowibowo
Keyword(s):  
Light Source ◽  
White Light ◽  
Measurement Accuracy ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Light Spectrum ◽  
Light Emitting ◽  
Average Accuracy

Abstract Light spectrum dispersion is an exciting subjectin science because of its beautiful atmospheric colour phenomenon which attracts students. However, to see the phenomenon is not easy since it needs a spectrometer, which is commonly expensive. Therefore, the present study aims to describe a low-cost spectrometer for investigating lighting spectrum and analysing the purity of honey as a pedagogical students’ project. The spectrometer was constructed from a webcam connected to a laptop, a free spectrometer software, DVD disk, and black cardboard. The calibration of the developed spectrometer used an Argon (Ar) lamp. Afterwards, measurement tests were carried out by using Neon (Ne) and Xenon (Xe) lamps. A white light-emitting diode was used as a light source to measure several types of honey wavelengths. The results from the experiment show that the wavelength of Ar, Ne, and Xe are (503 ± 4) nm, (463 ± 3) nm, and (451 ± 3) nm respectively. The measurement accuracy of the spectrometer is 99.5%. In addition, the commercial honey characterisations show that pure honey tends to have an excellent and smooth spectrum with one peak. On the contrary, the adulteries honeys show a rough wave with many peaks representing the inhomogeneous ingredients. It is found that the average accuracy for honey spectrum is 99.8%. Moreover, the low-cost spectrometer can be built and used easily by students for educational purposes.

1.331μm Narrow-Bandwidth Light Source Based on Polymer Micro-Blazed Grating

2008 ◽  
Author(s):  
Hairong Wang ◽  
Xianni Gao ◽  
Guoliang Sun ◽  
Yulong Zhao ◽  
Zhuangde Jiang
Keyword(s):  
Light Source ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Diffraction Order ◽  
Blazed Grating ◽  
Light Emitting ◽  
Led Light ◽  
Narrow Bandwidth ◽  
Narrow Width ◽  
The Cost

In order to detect methane (CH4) accurately and reliably, this paper presents a sensor which consists of infrared diode, fixtures, blazed grating, to realize the extremely narrow-bandwidth light at wavelength of 1.331μm. Based on factors such as compatibility with the transmission characteristics of silica fiber and the cost, a LED (light-emitting diode) with center wavelength of 1.3μm is selected. The LED light is modulated as the parallel light beam. As the light is incident in a micro-blazed grating with certain angle, by diffraction and interference, the light will output the maximum light intensity of its diffraction order at 1.331 μm, which just is an absorption peak of CH4. Micro-blazed grating applied here is low cost and easy replication by various ways, which makes extreme narrow width wavelength possible. Simulation and analysis indicate the designed prototype can output 1.331μm with bandwidth from 1.32907μm to 1.332495μm. With the light source basing on light dividing system, more reliable and higher sensitive measurement of the dangerous gases such as methane and carbon monoxide (CO) can be realized.

Dual Fiber-Optic Fabry–Perot Interferometer Temperature Sensor with Low-Cost Light-Emitting Diode Light Source

2008 ◽  
Vol 47 (4) ◽  
pp. 3236-3239 ◽  
Author(s):  
Mu-Chun Wang ◽  
Zhen-Ying Hsieh ◽  
Yuan-Tai Tseng ◽  
Fan-Gang Tseng ◽  
Heng-Sheng Huang ◽  
...  
Keyword(s):  
Light Source ◽  
Temperature Sensor ◽  
Fiber Optic ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Light Emitting ◽  
Fabry Perot

The Color Mixing White-Light LEDs

2013 ◽  
Vol 378 ◽  
pp. 440-443
Author(s):  
Chiu Jung Yang ◽  
Chien Sheng Huang ◽  
Chih Wei Chen ◽  
Po Wen Chen
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Optical Power ◽  
Integrating Sphere ◽  
Light Spectrum ◽  
Light Emitting ◽  
Driver Circuit ◽  
Color Mixing ◽  
Color Rendering

Thepaperis discussedin coloruniformity study.The experiment divided into two steps in this study,first is modules design and simulation. Second is fabrication and measurement.After measure the LEDs property, calculating the ratio of each colored LEDs by using Grassmanns Law,modeling by Solidworks, and simulating the front study by optical software TracePro.Using four-color mixing with self-developed formula to avoid the present white light emitting diode patent, and the four-color grains are Red, Green, Blue and adding Y to modify the overall quality of the mixed light.The phosphorproduceSteabler-Wronsk hardly in the high temperatureas compared tofour-color mixing.Using four-color mixing to producehigher color rendering index than yellow phosphor.Series-parallel array of grain arrangement adopted to achieve the high demand for uniformity, while simplifying the design conditions by a certain current instead of the general mixed light-driven complex driver circuit,the completion of the mixing module using integrating sphere, light spectrum on the spectrophotometer, optical power, color coordinates values, such as mixing uniformity measurements.The chromaticity coordinates errors after complete results of the mixing module measurement and simulation can be controlled under (0.01x, 0.01y).

Characterization of low-cost organic phosphor for white light-emitting diode

2008 ◽  
Author(s):  
Fuh-Shyang Juang ◽  
Ming-Hua Chang ◽  
Mark O. Liu ◽  
Wen-Ray Chen
Keyword(s):  
White Light ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Light Emitting ◽  
Organic Phosphor

scholarly journals Colour-Encoded Electroluminescent White Light-emitting Diode Enabled by Perovskite-Cu-In-S Quantum Composites

2021 ◽  
Author(s):  
Seung-Bum Cho ◽  
Jung Inn Sohn ◽  
Sang-Seok Lee ◽  
Seung-Gyun Moon ◽  
Bo Hou ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Light Source ◽  
White Light ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Large Area ◽  
Solution Processed ◽  
Light Emitting ◽  
Ambient Lighting ◽  
White Light Emitting Diodes

Solution-processed quantum dot (QD) white light-emitting diodes (WLEDs) have received much attention as a viable light source in the next-generation large-area ambient lighting, flexible photonics and full-colour display backlighting technologies....

scholarly journals Paper-Based Low Cost Optical Filter

2020 ◽  
Author(s):  
Ajay Tripathi ◽  
Rajesh Rawat ◽  
Archana Tiwari
Keyword(s):  
White Light ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Optical Filter ◽  
Infrared Region ◽  
White Paper ◽  
Selective Absorption ◽  
Absorption Mechanism ◽  
Light Emitting

<p>We report simple and inexpensive technique using several sheets of white paper for filtering the blue and non-blue radiation of a white light emitting diode source in the transmission mode. We visibly illustrate successful rejection of specific energy of white light by the filtering papers through absorption mechanism where weak transmission of blue and red radiations are observed. In addition, photoluminescence arising from the papers in near infrared region is also presented while using the white light excitation. Owing to the presence of different whitening agents in the papers, selective absorption and divergent coloured emission from the sheets are observed.</p>

scholarly journals Tuning the white light spectrum of light emitting diode lamps to reduce attraction of nocturnal arthropods

2015 ◽  
Vol 370 (1667) ◽  
pp. 20140125 ◽  
Author(s):  
Travis Longcore ◽  
Hannah L. Aldern ◽  
John F. Eggers ◽  
Steve Flores ◽  
Lesly Franco ◽  
...  
Keyword(s):  
Los Angeles ◽  
White Light ◽  
Light Emitting Diode ◽  
Spectral Composition ◽  
Unintended Consequences ◽  
Light Spectrum ◽  
Ecological Processes ◽  
Light Emitting ◽  
Study Sites ◽  
Indoor Lighting

Artificial lighting allows humans to be active at night, but has many unintended consequences, including interference with ecological processes, disruption of circadian rhythms and increased exposure to insect vectors of diseases. Although ultraviolet and blue light are usually most attractive to arthropods, degree of attraction varies among orders. With a focus on future indoor lighting applications, we manipulated the spectrum of white lamps to investigate the influence of spectral composition on number of arthropods attracted. We compared numbers of arthropods captured at three customizable light-emitting diode (LED) lamps (3510, 2704 and 2728 K), two commercial LED lamps (2700 K), two commercial compact fluorescent lamps (CFLs; 2700 K) and a control. We configured the three custom LEDs to minimize invertebrate attraction based on published attraction curves for honeybees and moths. Lamps were placed with pan traps at an urban and two rural study sites in Los Angeles, California. For all invertebrate orders combined, our custom LED configurations were less attractive than the commercial LED lamps or CFLs of similar colour temperatures. Thus, adjusting spectral composition of white light to minimize attracting nocturnal arthropods is feasible; not all lights with the same colour temperature are equally attractive to arthropods.

scholarly journals Paper-Based Low Cost Optical Filter

2020 ◽  
Author(s):  
Ajay Tripathi ◽  
Rajesh Rawat ◽  
Archana Tiwari
Keyword(s):  
White Light ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Low Cost ◽  
Optical Filter ◽  
Infrared Region ◽  
White Paper ◽  
Selective Absorption ◽  
Absorption Mechanism ◽  
Light Emitting

<p>We report simple and inexpensive technique using several sheets of white paper for filtering the blue and non-blue radiation of a white light emitting diode source in the transmission mode. We visibly illustrate successful rejection of specific energy of white light by the filtering papers through absorption mechanism where weak transmission of blue and red radiations are observed. In addition, photoluminescence arising from the papers in near infrared region is also presented while using the white light excitation. Owing to the presence of different whitening agents in the papers, selective absorption and divergent coloured emission from the sheets are observed.</p>

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