Analysis on the Optical Response of Ldr and Phototransistor in Photoplethysmography

Ojeda, Celeste M.; Cruz, Jennifer C. Dela

doi:10.1016/j.sbsr.2020.100334

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…This study involved testing different quantities of yellow, orange, and red [30] LED sources vis-à-vis phototransistor, LDR, and photodiode. The principle followed was Backscatter Radiation which utilized the rebound of photons taking place from light source to measured area to photosensor.…”

Section: Methodsmentioning

confidence: 99%

“…Particularly, it aims to (1) ascertain the best LED color and its corresponding wavelength for the recognition of PPG signal in the dorsal and palmar skin of volunteers; (2) identify the number of LED to be used for best PPG signal detection in the specified skin of volunteers or participants and; (3) distinguish the best light sensor or detector for PPG signal detection in the dorsal and palmar skin of volunteers. This study used yellow, red, and orange [30] LEDs, with wavelengths at 590 nm, 630-640 nm, 610 nm, respectively, as the light sources where the detection of PPG signal was observed byaltering its quantity. Considering the specific wavelength of each LED source used, its depth of penetration [31] plays an imperative function in the measurement of the desired signal.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

2020

IJATCSE

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This study presents the potential of using photoplethysmography (PPG) as an alternative to the use of expensive spectroscopy or invasive skin biopsy to analyse skin conditions, particularly of the presence or absence of melanin in both dorsal and palmar skin of human subjects. This study seeks to analyse the sensing capabilities of three photodetectors (phototransistor, light dependent resistor, photodiode) vis-à-vis varying LED colors and quantities using backscatter radiation. Further, it intends to distinguish the best detector and LED color-quantity combination for the sensing of PPG signal in both dorsal and palmar skin of human volunteers. Photoplethysmography (PPG) is considered as a facile and cost effective optical process frequently used for monitoring heart rate. A light source or emitter and a light sensor or detector make up a PPG circuit. A light emitting diode (LED) is the frequently used light source while phototransistor, photodiode or light dependent resistor are the usual light sensors or detector employed. The simulation results revealed that four pieces of yellow LED and phototransistor detector are the best combination for applications involving the melanin in dorsal and palmar skin. The results further showeddirect proportionality relationship between reflected light and age.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

2020

IJATCSE

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“…As the name suggests, the ambient light sensor will help in detecting the amount light present in surroundings. This will thus help in judgement of whether the place is dimly lit or brightly lit in case of indoor conditions [16], [17]. In case of lowly lit surroundings, an light-emitting diode (LED) module shall be switched on to provide visibility for the rover to move.…”

Section: Ambient Light Sensormentioning

confidence: 99%

Remote surveillance of enclosed and open architectures using unmanned vehicle with advanced security

Khetan,

Sarkar,

Sabunwala

et al. 2024

IJRES

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<p>Monitoring behavior, numerous actions, or any such information is considered as surveillance and is done for information gathering, influencing, managing, or directing purposes. Citizens employ surveillance to safeguard their communities. Governments do this for the purposes of intelligence collection, including espionage, crime prevention, the defense of a method, a person, a group, or an item; or the investigation of criminal activity. Using an internet of things (IoT) rover, the area will be secured with better secrecy and efficiency instead of humans, will provide an additional safety step. In this paper, there is a discussion about an IoT rover for remote surveillance based around a Raspberry Pi microprocessor which will be able to monitor a closed/open space. This rover will allow safer survey operations and would help to reduce the risks involved with it.</p>

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The design of automatic clothes drying device using an Arduino Uno

Evalina,

Pasaribu,

Yolanda

et al. 2023

International Conference on Research Innovations: Trends in Science and Technology

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Analysis on the Optical Response of Ldr and Phototransistor in Photoplethysmography

Cited by 6 publications

References 25 publications

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

Evaluation of Photodetectors for the Photoplethysmographic Signal Detection of Hand Epidermal Layer

Remote surveillance of enclosed and open architectures using unmanned vehicle with advanced security

The design of automatic clothes drying device using an Arduino Uno

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