Fibers for low-temperature radiometric measurements

Zur, Albert; Katzir, Abraham

doi:10.1364/ao.26.001201

Cited by 35 publications

(12 citation statements)

References 5 publications

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“…The mean values and corresponding standard deviations from the three calibrations are shown in Figure A. The BBR signals from the three calibrations are insensitive to the distance, which is consistent with previous theoretical studies that a fiber radiometric thermometer is insensitive to the distance between the fiber end to a thermal surface . The mean values can be fitted by a power function very well as indicated by the correlation coefficient, R .…”

Section: Resultssupporting

confidence: 87%

Development of hyperthermia measurable fiber radiometric thermometer for thermotherapy

Franz

Wang

2020

Journal of Biophotonics

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Temperature monitoring is extremely important during thermotherapy. Fiber-optic temperature sensors are preferred because of their flexibility and immunity to electromagnetic interference. Although many types of fiberoptic sensors have been developed, clinically adopting them remains challenging. Here, we report a silica fiber-based radiometric thermometer using a lowcost extended InGaAs detector to detect black body radiation between 1.7 and 2.4 μm. For the first time, this silica fiberbased thermometer is capable of measuring temperatures down to 35 C, making it suitable for monitoring hyperthermia during surgery. In particular, the thermometer has potential for seamless integration with current silica fiber catheters, which are widely used in laser interstitial thermotherapy. The feasibility, capability and sensitivity of tracking tissue temperature variation were proved through ex vivo tissue studies. After further improvement, the technology has the potential to be translated into clinics for monitoring tissue temperature. K E Y W O R D Sblack body radiation, hyperthermia, laser interstitial thermotherapy, silica fiber, thermotherapy

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Section: Resultssupporting

confidence: 87%

Development of hyperthermia measurable fiber radiometric thermometer for thermotherapy

Franz

Wang

2020

Journal of Biophotonics

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“…Therefore, it is important to quantify the BBR due to temperature at different working distances. Theoretically, BBR is independent of the working distance and the angle between the fiber and the tissue surface, but proportional to the numerical aperture and the fiber diameter [26]. We measured the BBR over a temperature range of 65-110°C with the fiber tip positioned at 1, 2, and 3 mm above the dry bath surface.…”

Section: Blackbody Radiation Measurement At Different Working Distancesmentioning

confidence: 99%

Detection of blackbody radiation during fiber guided laser-tissue vaporization

Franz

Wang

Zhu

et al. 2020

Biomed. Opt. Express

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Laser-tissue vaporization through a fiber catheter is evolving into a major category of surgical operations to remove diseased tissue. Currently, during a surgery, the surgeon still relies on personal experience to optimize surgical techniques. Monitoring tissue temperature during laser-tissue vaporization would provide important feedback to the surgeon; however, simple and low-cost temperature sensing technology, which can be seamlessly integrated with a fiber catheter, is not available. We propose to monitor tissue temperature during laser-tissue vaporization by detecting blackbody radiation (BBR) between 1.6 µm-1.8 µm, a relatively transparent window for both water and silica fiber. We could detect BBR after passing through a 2-meter silica fiber down to ∼70°C using lock-in detection. We further proved the feasibility of the technology through ex vivo tissue studies. We found that the BBR can be correlated to different tissue vaporization levels. The results suggest that this simple and low-cost technology could be used to provide objective feedback for surgeons to maximize laser-tissue vaporization efficiency and ensure the best clinical outcomes.

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“…The end face of transmitting fiber Φ can be denoted as ⊙O T . Every point on ⊙O T forms a normal light cone, and all light emitted from the emitting point is within the normal cone [18]. The light intensity distribution on the plane of receiving fiber Ψ is a linear superposition of all light cones reflected on the finite plate P from all emitting points on the end face of transmitting fiber Φ.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Normally, light exits an end-emitter fiber in a hypothetical cone of light defined by the numerical aperture (NA) of the fiber, and every light point on the end face of transmitting fiber brings about a local light cone which would be combined to form the whole emitting light [18]. The light intensity distribution on the end face of transmitting fiber is considered as Gauss distribution, as well as the light intensity distribution on every section of local light cone.…”

Section: Introductionmentioning

confidence: 99%

Fiber optic displacement measurement model based on finite reflective surface

Guan

2016

Optics & Laser Technology

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We present a fiber optic displacement measurement model based on finite reflective plate. The theoretical model was derived, and simulation analysis of light intensity distribution, reflective plate width, and the distance between fiber probe and reflective plate were conducted in details. The three dimensional received light intensity distribution and the characteristic curve of light intensity were studied as functions of displacement of finite reflective plate. Experiments were carried out to verify the established model. The physical fundamentals and the effect of operating parameters on measuring system performance were revealed in the end.

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Fibers for low-temperature radiometric measurements

Cited by 35 publications

References 5 publications

Development of hyperthermia measurable fiber radiometric thermometer for thermotherapy

Development of hyperthermia measurable fiber radiometric thermometer for thermotherapy

Detection of blackbody radiation during fiber guided laser-tissue vaporization

Fiber optic displacement measurement model based on finite reflective surface

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