WordNet
- a meter that measures the reflectance of a surface
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出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2018/01/19 16:52:54」(JST)
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Some scientific instruments commonly designated Reflectometer are:
- Vector Network Analyser (VNA)
- Spectrophotometer: in optics, an instrument for measuring the reflectivity or reflectance of reflecting surfaces
- Optical time domain reflectometer
- Reflectometer (electronics): In electronics, a directional coupler containing matched calibrated detectors in both arms of the auxiliary line, or a pair of single-detector couplers oriented so as to measure the electrical power flowing in both directions in the main line
- Time-domain reflectometer
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- 1. 小児における急性中耳炎:診断acute otitis media in children diagnosis [show details]
…reflex can be observed for change during the assessment of mobility. Tympanometry and acoustic reflectometry are techniques to predict the presence or absence of middle ear effusion. Neither technique provides …
- 2. 小児における滲出液を伴う中耳炎(滲出性中耳炎):臨床的特徴および診断otitis media with effusion serous otitis media in children clinical features and diagnosis [show details]
…persisted for ≥3 months (ie, chronic OME). Tympanometry and acoustic reflectometry – Tympanometry and acoustic reflectometry may be used to confirm the presence of middle ear fluid but are not helpful …
English Journal
- Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz.
- Wu B1, Tuncer HM2, Naeem M3, Yang B4, Cole MT2, Milne WI2, Hao Y3.Author information 11] School of Electronic Engineering and Computer Science, Queen Mary University of London, London, E1 4NS, United Kingdom [2] School of Electronic Engineering, Xidian University, Xi'an, 710071, China.2Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, United Kingdom.3School of Electronic Engineering and Computer Science, Queen Mary University of London, London, E1 4NS, United Kingdom.41] School of Electronic Engineering and Computer Science, Queen Mary University of London, London, E1 4NS, United Kingdom [2] Engineering, Sports & Sciences Academic Group, University of Bolton, Deane Road, Bolton, BL3 5AB, United Kingdom.AbstractThe development of transparent radio-frequency electronics has been limited, until recently, by the lack of suitable materials. Naturally thin and transparent graphene may lead to disruptive innovations in such applications. Here, we realize optically transparent broadband absorbers operating in the millimetre wave regime achieved by stacking graphene bearing quartz substrates on a ground plate. Broadband absorption is a result of mutually coupled Fabry-Perot resonators represented by each graphene-quartz substrate. An analytical model has been developed to predict the absorption performance and the angular dependence of the absorber. Using a repeated transfer-and-etch process, multilayer graphene was processed to control its surface resistivity. Millimetre wave reflectometer measurements of the stacked graphene-quartz absorbers demonstrated excellent broadband absorption of 90% with a 28% fractional bandwidth from 125-165 GHz. Our data suggests that the absorbers' operation can also be extended to microwave and low-terahertz bands with negligible loss in performance.
- Scientific reports.Sci Rep.2014 Feb 19;4:4130. doi: 10.1038/srep04130.
- The development of transparent radio-frequency electronics has been limited, until recently, by the lack of suitable materials. Naturally thin and transparent graphene may lead to disruptive innovations in such applications. Here, we realize optically transparent broadband absorbers operating in the
- PMID 24549254
- The ocular biometric differences of diabetic patients.
- Kocatürk T1, Zengin MO, Cakmak H, Evliçoglu GE, Dündar SO, Omürlü IK, Unübol M, Güney E.Author information 11Department of Ophthalmology, Faculty of Medicine, Adnan Menderes University, Aydin - Turkey.Abstract<p><bold>Purpose:</bold> To investigate the differences in ocular biometric and keratometric characteristics in comparison with biometric measurements using the noncontact optical low coherence reflectometer (OLCR) (Lenstar LS 900, Haag-Streit) on diabetic patients.</p><p><bold>Methods:</bold> The eyes of 170 patients were included in this study, including 81 diabetic and 89 nondiabetic subjects. Optical biometric measurements of diabetic and nondiabetic patients (between the ages of 25 and 85 years) who applied to the ophthalmology clinic were noted from March to June 2013. Detailed ophthalmologic examinations were done for every subject. Biometric measurements were done using the noncontact OLCR device.</p><p><bold>Results:</bold> Patient age ranged from 29 to 83 years. Subgroup analyses were done in diabetic patients according to their Hba1C levels. The minimum Hba1C value was 5.3, maximum was 12.4, and mean was 7.56 ± 1.48. The median duration of diabetes was 5 years (25th-75th percentile 3.00-11.75). Diabetic patients were found to have thicker lens and shallower anterior chamber in both eyes compared to nondiabetic control subjects. There were no statistical differences between the groups according to central corneal thickness, axial length, or keratometric values in both eyes. However, lens thicknesses were found to be thicker and anterior chamber depth values were found to be shallower in the diabetic group in both eyes.</p><p><bold>Conclusions:</bold> It may useful to determine eyeglasses prescription, refractive surgery calculation, lens selection, and previous cataract surgery according to biometric measurements after the regulation of blood glucose.</p>
- European journal of ophthalmology.Eur J Ophthalmol.2014 Feb 18:0. doi: 10.5301/ejo.5000446. [Epub ahead of print]
- <p><bold>Purpose:</bold> To investigate the differences in ocular biometric and keratometric characteristics in comparison with biometric measurements using the noncontact optical low coherence reflectometer (OLCR) (Lenstar LS 900, Haag-Streit) on diabetic patients.</p><p&
- PMID 24557759
- Tear film measurement by optical reflectometry technique.
- Lu H1, Wang MR1, Wang J2, Shen M2.Author information 1University of Miami, Department of Electrical and Computer Engineering, Coral Gables, Florida 33146.2University of Miami, Bascom Palmer Eye Institute, Miami, Florida 33136.AbstractABSTRACT. Evaluation of tear film is performed by an optical reflectometer system with alignment guided by a galvanometer scanner. The reflectometer system utilizes optical fibers to deliver illumination light to the tear film and collect the film reflectance as a function of wavelength. Film thickness is determined by best fitting the reflectance-wavelength curve. The spectral reflectance acquisition time is 15 ms, fast enough for detecting film thickness changes. Fast beam alignment of 1 s is achieved by the galvanometer scanner. The reflectometer was first used to evaluate artificial tear film on a model eye with and without a contact lens. The film thickness and thinning rate have been successfully quantified with the minimum measured thickness of about 0.3 μm. Tear films in human eyes, with and without a contact lens, have also been evaluated. A high-contrast spectral reflectance signal from the precontact lens tear film is clearly observed, and the thinning dynamics have been easily recorded from 3.69 to 1.31 μm with lipid layer thickness variation in the range of 41 to 67 nm. The accuracy of the measurement is better than ±0.58% of the film thickness at an estimated tear film refractive index error of ±0.001. The fiber-based reflectometer system is compact and easy to handle.
- Journal of biomedical optics.J Biomed Opt.2014 Feb 1;19(2):27001. doi: 10.1117/1.JBO.19.2.027001.
- ABSTRACT. Evaluation of tear film is performed by an optical reflectometer system with alignment guided by a galvanometer scanner. The reflectometer system utilizes optical fibers to deliver illumination light to the tear film and collect the film reflectance as a function of wavelength. Film thickn
- PMID 24500519
Japanese Journal
- Multi-point measurement using two-channel reflectometer with antenna switching for study of high-frequency fluctuations in GAMMA 10
- モリブデン青の膜捕集を利用するリンの高感度なオンサイト反射吸光光度定量
- Temperature sensing using an optical time domain reflectometer and mechanical long-period fiber gratings fabricated from a heat-shrinkable tube
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