Three-wavelength passive demodulation technique for the interrogation of EFPI sensors with arbitrary cavity length

Jia, Jinhua; Jiang, Yi; Gao, Hong; Zhang, Liuchao; Jiang, Yuan

doi:10.1364/oe.27.008890

Cited by 35 publications

(12 citation statements)

References 16 publications

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“…This part introduces and illustrates the numerical model of the transmitted blue light and converted yellow light in the double-layer phosphor structure, from which changes can be made to create immense enhancement to LED efficiency. The blue light transmission and the conversion of yellow light in single layer remote phosphor package with the phosphor layer thickness of 2h expressed as ( 1) and ( 2) [21][22][23][24][25][26].…”

Section: Resultsmentioning

confidence: 99%

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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As the name infers, the triple-layer remote phosphor (TRP) has 3 phosphor layers includes the red Mg8Ge2O11F2:Mn 4+ phosphor layer on the top, the green MgCeAl11O19:Tb 3+ phosphor layer in the middle, and the yellow YAG:Ce 3+ layer at the bottom and is mentioned as a solution to increase the chromaticity and luminescence adequacy of the white LEDs (WLEDs) in this article. As to control the red light for higher value achieve in the color rendering index (CRI), using red Mg8Ge2O11F2:Mn 4+ phosphor in the TRP structure is recommended. All the outcomes indicate that when red phosphor Mg8Ge2O11F2:Mn 4+ concentration grows the CRI gets higher values, and drastically declines when the concentration of green phosphor MgCeAl11O19:Tb 3+ increases. As the same time, applying the green MgCeAl11O19:Tb 3+ phosphor layer to manage the green light as it can make the luminous efficacy (LE) of WLEDs increase. In particular, the index of LE can also be improved over 40% by limiting the scatter of light and putting in green light. Moreover, to preserve the average correlated color temperature (ACCT) stable at 8500K, the yellow YAG:Ce 3+ concentration must be cut down as the concentration of red and green phosphor rise.

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Section: Resultsmentioning

confidence: 99%

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Thi

That

2021

TELKOMNIKA

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“…As shown in Figure 1(A)~(D), passive quadrature phase retrieval can be achieved by multiple wavelength, 19,20,34,38–40 and also by dual F‐P cavity, 35,41 birefringence crystal, 36,42 and 2*2 coupler 37 . Passive quadrature phase demodulation schemes have high stability.…”

Section: Fast Interrogation Techniquesmentioning

confidence: 99%

“…However, in actual applications, the A might change, bringing inaccurate demodulation results. Three‐wavelength quadrature demodulation technology can eliminate the demodulation error caused by the change of the DC value, 34 so as to achieve a higher stability.…”

Section: Fast Interrogation Techniquesmentioning

confidence: 99%

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Liu

Peng

2021

Micro & Optical Tech Letters

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Low‐finesse fiber‐optic Fabry–Perot (F‐P) interferometric sensor has the advantages of high sensitivity, anti‐electromagnetic interference, and compact size, and is one of the most widely used optical fiber sensors. With the development of sensor design and demodulation algorithms, F‐P sensing technique plays an increasingly important role in high‐speed dynamic measurement, such as dynamic temperature or pressure, acoustic vibration, dynamic displacement, and distance. Signal demodulation methods largely determine the performance of the entire sensing system. Compared with quasi‐static measurement, high‐precision measurement of dynamic F‐P cavity is more challenging. The advancement of fast tunable laser technology in telecommunication field provides novel perspectives for demodulation methods and dynamic applications based on F‐P sensors. This article reviews the latest developments in fast interrogation techniques for dynamic low‐finesse F‐P sensors, including intensity demodulation, quadrature phase demodulation and absolute cavity length demodulation. In addition, array multiplexing and multi‐parameter measurement techniques are also involved.

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“…Beside the structure configuration that hugely affects the outcome of light, the attention should also be on the amount of phosphor materials presents in the device. Evidently, the light loss that damages the lighting efficiency and often appears in low CCTs WLEDs increases with the concentration of phosphor material [16]. Other possible causes for reduced luminous flux that have been pointed out by other research are high scattering and reflecting.…”

Section: Introductionmentioning

confidence: 96%

Using flat phosphor layer in dual-layer remote phosphor configuration to improve luminous efficacy

Thi

That

2021

TELKOMNIKA

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The phosphor layer shape and components distances are the subjects proposed to advance the quality of WLEDs in this article. The two distances, between phosphor layers (d1) and between the phosphor layer and the LED chip (d2) in Flat dual-remote phosphor (FDRP) and Concave dual-remote phosphor (CDRP) were examined by experiments to determine their impacts on WLEDs lighting performances. The results suggest that FDRP is a better option than CDRP for lighting performance. In each respective structure, the distances influence the lighting capacity and color output whenever they fluctuate. Therefore, to effectively control and study this phenomenon, the correlated color temperature is maintained at 8500 K, and the concentration of phosphor material is altered while the distances are changing. When d1 and d2 are at the starting value of 0, the recorded lumen output and chromatic performance of lighting devices are the lowest and begin to increase as d1 and d2 expand. Bigger d1 and d2 mean bigger scattering area and better chromatic light integration, which leads to higher color quality. Detailed results present that optimal values of d1 or d2 for the highest lumen output of 1020 lm are 0.08 mm or 0.63 mm, respectively. Meanwhile the lowest color deviation is accomplished with d1=0.64 mm or d2=1.35 mm.

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Three-wavelength passive demodulation technique for the interrogation of EFPI sensors with arbitrary cavity length

Cited by 35 publications

References 16 publications

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

MgCeAl11O19:Tb3+ and Mg8Ge2O11F2:Mn4+ in enhancing the color quality of remote phosphor LED

Fast interrogation of dynamic low‐finesse Fabry‐Perot interferometers: A review

Using flat phosphor layer in dual-layer remote phosphor configuration to improve luminous efficacy

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