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The NIST Spectrophotometry Short Course is offered every 2 years and covers the fundamentals of science and technology related to the accurate measurement of optical properties of materials. The NIST Spectrophotometry Short Course is a 5-day course held at NIST Gaithersburg, Maryland. This course is intended for engineers, scientists, technicians, managers, or others involved in the design or use of optical instrumentation, optical testing, or physical sciences in which optical properties of materials measurements are important. This course will be held in the NIST Metrology Building (220), Room B343 in Gaithersburg, Maryland. In full wave rectifier both the both half-cycles of the input are utilized with the help of two or four diode working alternately.
The full-wave rectifier circuit using two diodes and a centre-tapped transformer shown in Figure 1-1.


When input ac supply is switched on, the ends M and N of the transformer secondary become +ve and -ve alternately.
During the negative half-cycle, when the terminal N becomes +ve, then D2 conducts (but not D1) and current flows along ND2CABG. Participants will gain a good understanding of the theory and practice of spectrophotometry using dispersive and Fourier-transform techniques as well as optical scatterometry. The course consists of lectures and hands-on laboratory experiments covering the fundamentals of optical properties measurements, such as transmittance, reflectance, and BRDF.
Pre-registration is required and acceptance is determined on a first-come, first-served basis.
However, a block of rooms has been reserved at the Gaithersburg Holiday Inn,A Gaithersburg 301-948-8900. For full-wave rectification, use of the transformer is essential (through it is optional for half-wave rectification). During the positive half-cycle of the ac input, terminal M is +ve, G is at zero potential and N is at –ve potential.


Particular emphasis is placed on the evaluation of uncertainties in transmittance, reflectance, and bidirectional reflectance distribution function (BRDF) measurements.
Important sources of uncertainty and the relative merits of different experimental techniques, including dispersive, Fourier-transform, and laser-based schemes, are also addressed. Hence, being forward-biased, diode D1 conducts (but not D2 which is reversed-biased) and current flows along MD1CABG.
The course concludes with laboratory presentations by the students and an open discussion forum with NIST scientists. After that date the rooms will be released for general sale at the prevailing rates of the hotel. Registration for the course is limited to 12 attendees on a first-come, first-served basis.



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