|PDH Online Course Description||PDH Units/
Learning Units (Hours)
...by their standing electromagnetic waves use we may produce at will, from a sending station, an electrical effect in any particular region of the globe; with which we may determine the relative position or course of a moving object, such as a vessel at sea, the distance traversed by the same, or its speed.
Nikola Tesla, August 1917
Tesla was not the first to realize that wave energy could be reflected back off solid objects that distinction belonged to German physicist Heinrich Hertz who demonstrated the effect in 1886. From that point on, there was steady development of the principle around the world, but Tesla saw clearly its full potential sooner than most.
In the years leading up to WWII, many countries were experimenting and developing what the British called Radio Location. Realizing the growing threat to peace from the axis powers, the United States and Great Britain pooled their resources to develop a radio location system that would have no peer. They succeeded magnificently and in 1941, the U.S. Navys acronym: RADAR (RAdio Detection And Ranging) stuck, eventually becoming a noun in the English language.
Starting with the 1940 Battle of Britain, to the saturation bombing of the Japanese homeland at the tail-end of the war (1945), the secret weapon of radar was employed on land, sea and air thus ensuring the allied victory. The needs of the cold war hastened further development of radar systems taking full advantage of the Doppler Effect (to allow ground targets to be observed). In the mid-1950s, IBM introduced SAGE a sophisticated computer system to coordinate the voluminous data from radar stations and other sources. Radar had come a long way from its first use (in 1938) for directing searchlights it was at the very heart of national defense.
This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials., deaeration, disinfection and ultraviolet irradiation.
NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.
AIA Members: You must take the courses listed under the category "AIA/CES Registered Courses" if you want us to report your Learning Units (LUs) to AIA/CES. If you take courses not registered with AIA/CES, you need to report the earned Learning Units (not qualified for HSW credits) using Self Report Form provided by AIA/CES.