Ruby-based decay-time thermometry: effect of probe size on extended measurement range (77–800 K)

Hu, Youlin; Zhang, Z.Y.; Grattan, Kenneth T. V.; Palmer, A. W.; Meggitt, B. T.

doi:10.1016/s0924-4247(97)01523-9

Cited by 36 publications

(33 citation statements)

References 19 publications

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“…It should be noted that the curve-fit lines going through the data are second-order polynomials and are not linear. The magnitudes and trends of the curves agree well with results obtained by Hu et al [24] for large sensor sizes. A linear curve fit yields a temperature coefficient of approximately 0.012 s K −1 which agrees with literature from Aizawa et al [23].…”

Section: Calibration Of Sensorssupporting

confidence: 89%

Design of an optical thermal sensor for proton exchange membrane fuel cell temperature measurement using phosphor thermometry

Inman

Wang

Sangeorzan

2010

Journal of Power Sources

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Section: Calibration Of Sensorssupporting

confidence: 89%

Design of an optical thermal sensor for proton exchange membrane fuel cell temperature measurement using phosphor thermometry

Inman

Wang

Sangeorzan

2010

Journal of Power Sources

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“…Hu et al had investigated two different size sensing elements based fluorescence lifetime by ruby, the results provide evidence of calibration problems with larger probes, due to the redistribution of fluorescent light, over the low temperature region(<200K). But with the smaller probe, this problem does not occur again [9] . So, the ruby crystal was made in a small cylinder and inserted into the air core of the HC fiber in this paper.…”

Section: The Sensor Probe With Air-core Fibermentioning

confidence: 98%

“…In this probe, ruby does not contact to the fibers but keeping a small distance between them. (2) One large diameter fiber used in both pumping fiber and receiving fiber [9] . In this sensor probe, a ruby crystal as sensor head is connected mechanically with a jacket and optical adhesive.…”

Section: The Sensor Probe With Air-core Fibermentioning

confidence: 99%

“…In this sensor probe, a ruby crystal as sensor head is connected mechanically with a jacket and optical adhesive. [8] receiving fiber pumping fiber Fig.2 Schematic drawing of the sensor probe [ 9] pumping light return light large core-diameter silica fiber gold coating jacket &optical adhesive ruby Proc. of SPIE Vol.…”

Section: The Sensor Probe With Air-core Fibermentioning

confidence: 99%

“…Under the experimental data, it shows that the fluorescence decay time of ruby decrease monotonically with the increase of temperature over a wide region. Two group of data of the relations between the fluorescence lifetime and temperature in different temperature ranges are showed in Table1 and Table2 [9,8] . Using computer software, it is easy to get the final temperature result by using algebraic interpolation.…”

Section: Calibration Of the Sensormentioning

confidence: 99%

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Temperature sensor with microstructure fiber based ruby fluorescence lifetime

et al. 2006

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Hollow core bandgap microstructure fiber was used to make a probe of temperature sensor based ruby fluorescence lifetime. Fiber-optic temperature sensors using a fluorescent lifetime of ruby crystal are regarded as useful thermometer due to its wide dynamic range, intrinsic immunity to electromagnetic interference, small size, and calibration-free measurement. It often be used under extraordinary conditions. In these thermometer, a ruby crystal as sensor head is connected mechanically with the silica fibers or the sapphire fibers，or grown from the melt droplet on the end of the sapphire fibers. In this paper, microstructure fiber was used to make a temperature sensor probe based fluorescent lifetime. To avoid the redistribution of the photoluminescence, a small size ruby crystal with Cr 3+ concentration of 0.35at.% was made as a rod (with diameter 60 micron and 2 millimeter long) and was inserted to the air-core of the microstructure fiber at one end. The ruby rod was fastened in the hole by optical adhesive. The ruby crystal cylinder was plated with silver on its surface except the top side. The silver plating can hold the fluorescent light in the crystal and fiber to enhance the intensity of the week fluorescence signal, prevent stray light coming into the probe. Compared with the conventional optic-fiber temperature sensor, the microstructure fiber sensor based ruby fluorescence lifetime sensor has more advantages: such as larger dynamic range, higher precision and resolution, smaller size, and so wider applying region.

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Luminescence Lifetime Temperature Sensing Based on Sol-Gels and Poly(acrylonitrile)s Dyed with Ruthenium Metal–Ligand Complexes

Liebsch

Klimant²,

Wolfbeis

1999

Adv. Mater.

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Measurement of temperature is one of the most common applications of fiber optic sensing. Since light is used as the information carrierÐin contrast to electronic devices such as thermistors and thermocouplesÐoptical temperature sensors (so-called optodes) have applications even in explosive and electromagnetic environments. [1,2] Several approaches to sensing a wide range of temperatures have been reported [3±5] and some are commercially available.[6]A frequently employed methodology consists of monitoring the temperature-dependent lifetime of luminescent materials such as rare earth phosphors, [7] doped YAG crystals, [8] or ruby crystals. [9] However such materials cannot be used to form thin and fast responding temperature-sensitive coatings. Ruthenium(II)-diimine complexes are attractive and frequently used for optical lifetime sensing of chemical parameters such as pO 2 , pH, and pCO 2 .[10±12] Outstanding features include good luminescence quantum yield, strong absorption of visible light (which makes them excitable by light-emitting diodes (LEDs)), photostability, and luminescence lifetimes in the microsecond range. The luminescence decay time of ruthenium(II) complexes is known not only to be affected by temperature, but also by chemical quenchers. By selection of an appropriate polymer matrix we have obtained materials whose luminescence is almost exclusively governed by temperature, while interferences from external quenchers such as oxygen are excluded.In particular, we have identified Ru(phen) (rutheniumtris-1,10-phenanthroline) as the most viable temperature probe that can be incorporated into matrices of sol-gels or poly(acrylonitrile)s (PANs) and then can be spread as a thin film onto solid substrates. Its luminescence decay time is particularly strongly affected in the temperature range of physiological and related applications. Furthermore, Ru(phen) is commercially available, photostable, and can be easily incorporated into solid matrices by appropriate selection of the counterion.The use of Ru(phen) in optical temperature sensing requires a sophisticated encapsulation technique because its luminescence is known to be quenched by oxygen. In addition, interferences by other oxidative or reductive quenchers, including NO x and SO 2 , can be expected. Following an investigation of a number of materials with very low permeability for molecular oxygen, we identified densified solgel glass and PAN as being most suitable candidates for embedding Ru(phen) in a non-quenchable form. The composition of the materials investigated and respective figures of merit are summarized in Table 1.The two-state model of Demas et al. [13,14] is applicable to describe the temperature dependence of the luminescence lifetime. It attributes the temperature dependence of the excited state exclusively to a thermally activated non-radiative decay. The decrease in luminescence intensity and lifetime with rising temperature can be described by an Arrhenius-type model (Eq. 1) where k 0 is the temperatureindependent decay rate fo...

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Ruby-based decay-time thermometry: effect of probe size on extended measurement range (77–800 K)

Cited by 36 publications

References 19 publications

Design of an optical thermal sensor for proton exchange membrane fuel cell temperature measurement using phosphor thermometry

Design of an optical thermal sensor for proton exchange membrane fuel cell temperature measurement using phosphor thermometry

Temperature sensor with microstructure fiber based ruby fluorescence lifetime

Luminescence Lifetime Temperature Sensing Based on Sol-Gels and Poly(acrylonitrile)s Dyed with Ruthenium Metal–Ligand Complexes

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