# Introduction to neutron powder diffractometry by E Arzi; International Union of Crystallography

By E Arzi; International Union of Crystallography

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5 Identify the two primary types of optical detectors and their attributes. 6 Identify the structure and types of fiber optic cables. 7 Identify the characteristics of various fiber optic cable systems. 8 Define continuity and identify how to correctly configure a SPOT (Student Personal Optical Tester) or the DAVE-2 to determine optical continuity in a fiber optic cable. 9 Define attenuation and identify the causes of attenuation in fiber optic cables. Identify the test equipment used in fiber cabling and define the how to configure fiber cables for attenuation measurement.

The relationship, which includes the speed of light, is: f= c/'A or 'A= c/f Where f = frequency in Hertz A. = wavelength in meters c =the speed of light whi ch is 300,000,000 or 3 * 108 m/s If either wavelength or frequency is known, the unknown value can be calculated. 0000003 meters Figure 2-6 Comparison chart Don ' t let all the zero's or the very large or small numbers confuse or upset you. Scientists deal with large numbers all the time. When scientists deal with large or small numbers they handle all the zeros by using a technique called scientific notation.

I L======::JA 3. In the space provided below, briefly describe the function of each component from the above diagram. a. b. C. 4. One disadvantage of a Fiber Optic Cabling system is _ _ __ _ __ 5. Name three advantages of a Fiber Optic Cabling system. 6. If an LED has an operational wavelength of 850nm to 131 Onm and a LASER has an operational wavelength of 1350nm, a connectivity technician shou ld be able to determine that the _ __ has the higher operational frequency. 2-12 Introduction To Network Cabling- Fiber-Based Systems Module 2 Fiber Optic Systems Optical Sources Figure 2-12 The LASER and the LED As you recall, from earlier in this module, an optical source is the component that reacts to an input signal and creates light that is used for distribution of a signal through a medium.