TiO2 thin film temperature sensor monitored by smartphone

Pan, Tingting; Cao, Wen; Wang, Ming

doi:10.1016/j.yofte.2018.08.017

Cited by 28 publications

(18 citation statements)

References 17 publications

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“…Depending on the effect of the temperature, the disturbance created on the guided light can result in either an intensity variation [ 79,80 ] or a spectral shift. [ 93 ] In the latter, it requires the coupling of a diffraction grating to convert the spectral shift into an angular deviation that can be monitored through the position of the illuminated pixel, quantified from an image. This disturbance is afterward correlated with temperature to characterize the sensor.…”

Section: Optical Temperature Sensors For the Iotmentioning

confidence: 99%

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

Ramalho

Carlos

André³

et al. 2021

Advanced Photonics Research

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Sensors play a key role on the Internet of Things (IoT), providing monitoring inside and outside the networks in a multitude of parameters. A fundamental parameter to sense is temperature, being essential to acquire knowledge on the best way to include thermal sensing into the communications networks. Despite that the temperature measurement in the optical domain is well known for its advantages compared with the electric one, its incorporation in the IoT is a challenge due to the lack of affordable strategies able to convert optical into an electronic signal in a cost‐effective way. The coupling of such optical sensors to smartphones appears as an exciting strategy for mobile optical (mOptical) sensing. Herein, advances in optical temperature sensors for mOptical sensing are reviewed and the chronological mechanistic context of waveguided and nonguided optical signal sensors is outlined. A new path for advances in photonics research is traced, established by the incorporation of smartphones as a tool in science and engineering that foresees new designs for mOptical temperature sensor toward IoT.

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Section: Optical Temperature Sensors For the Iotmentioning

confidence: 99%

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

Ramalho

Carlos

André³

et al. 2021

Advanced Photonics Research

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“…The concept of the smartphone-based interrogation system, similar to most of the already known smartphone-based spectrometers (SPBS) [12], [13], [16] is depicted in Fig. 1(a).…”

Section: Smartphone-based Cfbg Interrogation Prototypementioning

confidence: 99%

Smartphone-Based Interrogation of a Chirped FBG Strain Sensor Inscribed in a Multimode Fiber

Markvart

Лиокумович

Medvedev

et al. 2021

J. Lightwave Technol.

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Smartphone-based interrogation of a fiber Bragg grating sensor is, to the best of our knowledge, reported for the first time. The smartphone flashlight LED was used as a light source and a transmissive diffraction grating projected the CFBG spectra on the smartphone camera. In order to efficiently couple light from the smartphone LED to the fiber with CFBG, multimode fiber was used for inscription. Interrogation setup consists of a smartphone and low-cost off-the-shelf available components. Measurement principle was illustrated through the fiber strain caused by applied longitudinal force. Attained measurement sensitivity and resolution were validated via comparison with commercial spectrometer and theoretical results based on Cramer-Rao approach. Also, to the best of our knowledge, the influence of modal noise on the smartphone-based fiber optic sensor interrogation system performance is considered for the first time.

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“…[ 5 ] By analyzing the shift in the histogram for the red and green channels after ultraviolet (UV) excitation, they were able to determine the temperature of the label between 283–317 K with an impressive average sensitivity of 5%/K and a temperature resolution better than 0.2 K. [ 5a ] Earlier work showed temperature sensing at the tip of a fiber probe was possible with a diffraction grating and smartphone (range of 263–453 K). [ 6 ] More broadly, there is a broad and successful ongoing literature demonstrating the effectiveness of quantitative analysis of photoluminescence (PL) intensity or color with a smartphone for chemical assays, [ 7 ] and anti‐counterfeiting purposes. [ 8 ] For example, a lateral flow assay using SrAl 2 O 4 :Eu 2+ ,Dy 3+ nanophosphors with persistent luminescence allowed the intensity of light emitted in the test and control strips to be quantitatively determined after the smartphone flash excitation was turned off.…”

Section: Introductionmentioning

confidence: 99%

Smartphone‐Based Luminescent Thermometry via Temperature‐Sensitive Delayed Fluorescence from Gd₂O₂S:Eu³⁺

Katumo

Gao

Laufer

et al. 2020

Advanced Optical Materials

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Thermal images generated from infrared radiation are useful for monitoring many processes; however, infrared cameras are orders of magnitude more expensive than their visible counterparts. Methods that allow visible cameras to capture thermal images are therefore of interest. In this contribution, thermal images of a surface coated with an inexpensive inorganic micropowder phosphor are generated from the analysis of a video taken with a smartphone camera. The phosphor is designed to have a temperature‐dependent emission lifetime that is long enough to be determined from the analysis of a 30 frames‐per‐second video recording. This proof‐of‐principle work allows temperatures in the 270–320 K range to be accurately determined with a precision better than 2 K, even in the presence of bright background illuminance up to 1500 lm m−2. In the broader context, this inspires further development of phosphors to bring time‐resolved sensing techniques into lifetime long enough ranges to allow smartphone‐based detection.

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TiO2 thin film temperature sensor monitored by smartphone

Cited by 28 publications

References 17 publications

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

Smartphone-Based Interrogation of a Chirped FBG Strain Sensor Inscribed in a Multimode Fiber

Smartphone‐Based Luminescent Thermometry via Temperature‐Sensitive Delayed Fluorescence from Gd₂O₂S:Eu³⁺

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TiO2 thin film temperature sensor monitored by smartphone

Cited by 28 publications

References 17 publications

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

mOptical Sensing for the Internet of Things: A Smartphone‐Controlled Platform for Temperature Monitoring

Smartphone-Based Interrogation of a Chirped FBG Strain Sensor Inscribed in a Multimode Fiber

Smartphone‐Based Luminescent Thermometry via Temperature‐Sensitive Delayed Fluorescence from Gd2O2S:Eu3+

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Smartphone‐Based Luminescent Thermometry via Temperature‐Sensitive Delayed Fluorescence from Gd₂O₂S:Eu³⁺