scholarly journals Development of an optical pH measurement system based on colorimetric effect

2021 ◽  
Vol 24 (2) ◽  
pp. 728
Author(s):  
Puteri Nur Syahirah Mohamed Mustafa ◽  
Aiman Shahmi Azam ◽  
Mohd Suhaimi Sulaiman ◽  
Ahmad Fairuz Omar ◽  
Mohamad Faizal Abd Rahman
Keyword(s):  
Measurement System ◽  
Light Emitting Diode ◽  
Ph Measurement ◽  
Phenol Red ◽  
Detection Mechanism ◽  
Light Emitting ◽  
Labview Software ◽  
Data Processing Method ◽  
Final Measurement ◽  
Ph Level

<p>This paper proposed an optical pH measurement system developed to measure the changes of pH levels based on colorimetric reactions with phenol red reagent. The optical sensing was achieved through the implementation of a pair of light emitting diode (LED) and photodiode. The detection mechanism was based on different absorbance of light intensity at pH values of 2.36, 8.32, 9.08 and 12.83. The data processing method was carried out using LabVIEW software and interfaced with NI USB DAQ 6008. The measured voltage showed a good correlation in relation to the pH level with R2 equals to 0.9624. This relationship was used as a calibration curve in the final system testing. The final measurement of pH showed a good agreement between the actual and measured values with an error of less than 5%, thus indicating the reliability of the proposed system.</p>

scholarly journals A hybrid fiber-optic photoluminescence measurement system and its application in InGaN/GaN light emitting diode epi-wafer morphology studies

2012 ◽  
Vol 20 (17) ◽  
pp. 19535 ◽  
Author(s):  
Sohee An ◽  
Yong Gon Seo ◽  
Woohyun Jung ◽  
Minkyu Park ◽  
Jiyoung Park ◽  
...  
Keyword(s):  
Measurement System ◽  
Fiber Optic ◽  
Light Emitting Diode ◽  
Hybrid Fiber ◽  
Light Emitting

Position Measurement of Oscillating Linear Movement of Mechatronic Device

1970 ◽  
Vol 109 (3) ◽  
pp. 7-10 ◽  
Author(s):  
V. Jankūnas ◽  
D. Eidukas ◽  
E. Guseinovienė
Keyword(s):  
Measurement System ◽  
Optical Sensor ◽  
Light Emitting Diode ◽  
Practical Implementation ◽  
Position Measurement ◽  
Light Emitting ◽  
Linear Movement ◽  
Linear Optical ◽  
Different Color ◽  
Moving Parts

The problem of measurement of the curve of movement of oscillating synchronous electric devices is discussed. To achieve the purpose system, the light emitting diode (LED) - slit - linear optical sensor is used. Different color LEDs are linked with different moving parts and optical sensor with the lines of the elements sensitive to different colors, are used to simplify measurement system. Practical implementation of measurement system is presented. Ill. 8, bibl. 4 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.160

scholarly journals Measurement, Simulation, and Quantification of Lighting-Space Flicker Risk Levels Using Low-Cost TCS34725 Colour Sensor and IEEE 1789-2015 Standard

2021 ◽  
Vol 8 (2) ◽  
pp. 239-254
Author(s):  
Sivachandran R. Perumal ◽  
◽  
Faizal Baharum ◽  
Keyword(s):  
Light Emitting Diode ◽  
Low Cost ◽  
International Standards ◽  
Risk Level ◽  
Building Performance ◽  
Light Emitting ◽  
Risk Levels ◽  
Smart Lighting ◽  
Data Processing Method ◽  
Lighting Application

Building owners are transitioning towards a smart lighting solution for illumination purposes. LED (Light Emitting Diode) lighting application has become a norm given its high efficacy and energy efficiencies. This paper presents an approach to monitor the percent flicker conformance of interior building lighting to international standards. The focus is on flickers induced by LED lightings. This experiment utilises a TCS34725 RGB (red, green, blue) colour sensor to measure the flicker parameters of interior lighting spaces. Light-sensitive photodiodes in the sensor detect changes in lighting intensity, and output digitised values. A Raspberry Pi4 minicomputer processes the data measured for comparison to several standards. Non-conformance is reported to building owners to take corrective actions and minimise flicker discomfort exposure to building occupants. A flicker risk level factor is determined to gauge the severity when flickers are present. This method may be used to replace luminaires or fix flickering lighting issues in buildings. The results show that the monitoring system is functional. The proposed measurement and data processing method can be incorporated into any smart building hub for automation and building performance analysis. The method may also be used to measure non-LED lighting flickers.

scholarly journals Study of Temperature Effect on Luminous Flux of High Power Chip on Board Light Emitting Diode

2014 ◽  
Vol 24 (3) ◽  
pp. 267
Author(s):  
Cao Xuan Quan ◽  
Vu Khanh Xuan ◽  
Luu Thi Lan Anh ◽  
Vo Thach Son
Keyword(s):  
Solid State ◽  
Temperature Effect ◽  
Measurement System ◽  
High Power ◽  
Light Emitting Diode ◽  
Flux Measurement ◽  
Luminous Flux ◽  
Light Emitting

High power chip on board light emitting diode (HPCOBLED) are a promising solid state light technology for a variety of lighting applications. In this study, we studied temperature effect on luminous flux of HPCOBLED using VMI-PR-001 system of Vietnam Metrology Institute. The results according to the temperature Tc is increasing, luminous flux reduced. Especially HPCOBLED is larger power, decreasing luminous flux is larger. Reason of this is chance power.   HPCOBLED model describes the temperature affection on luminous flux of HPCOBLED. The results of HPCOBLED model matched with that measured by the luminous flux measurement system (VMI-PR-001, Vietnam).

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

Sign in / Sign up

Export Citation Format

Share Document