The Doppler Effect Essay: The Physics Of Police Sound
The second type of measurement that coincides with distance is speed. The most common devices that are used to receive speed measurements are radar guns. Georgia State University’s website, “Police Radar” focusses on the process of typical radar guns. Typical guns expel microwave waves off to the atmosphere while the gun is directed to hit towards a target From there, an object moving by who hits it sends the waves back with its modified frequency caused by the Doppler Effect (Georgia State University, “Police Radar”). This effect essentially changes the receiving waves from the radar because it bounces back from an object with changing distance from the radar by having speed. These variables then cause disturbances in the waves in which it
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According to R. James Seffrin, a director for the Definitive Internet Resource for Infrared Thermography, Seffrin explains that all objects emit infrared radiation as long as the object is above absolute zero (Kelvins). The cameras that can see and distinguish temperature are called, “thermal imagers.” These imagers convert the perceived radiation into scaled colors relative to its temperature and create a different color per area. The basis to how these camera can see this radiation is that objects have blackbody radiation (Seffrin). Objects that can absorb light would also emit radiation (Rossing, 129). The emittance makes it identifiable to the camera and scalable to the real current temperature. These imagers have been used in the military but are also used in the public. There are many current uses for them including measuring surface temperature. Imaging radiometers are used to measure surface temperature. Figure 4 shows the use of it with this man. Since not all heat of a person is distributed evenly, there are small indications of parts of him with slight cold and slight hot spots but, in general, he is pictured to radiate around 32 degrees centigrade. However, there is a downside, which Seffrin explains, “…is that infrared equipment is unable to see through most objects.”
According to R. James Seffrin, a director for the Definitive Internet Resource for Infrared Thermography, Seffrin explains that all objects emit infrared radiation as long as the object is above absolute zero (Kelvins). The cameras that can see and distinguish temperature are called, “thermal imagers.” These imagers convert the perceived radiation into scaled colors relative to its temperature and create a different color per area. The basis to how these camera can see this radiation is that objects have blackbody radiation (Seffrin). Objects that can absorb light would also emit radiation (Rossing, 129). The emittance makes it identifiable to the camera and scalable to the real current temperature. These imagers have been used in the military but are also used in the public. There are many current uses for them including measuring surface temperature. Imaging radiometers are used to measure surface temperature. Figure 4 shows the use of it with this man. Since not all heat of a person is distributed evenly, there are small indications of parts of him with slight cold and slight hot spots but, in general, he is pictured to radiate around 32 degrees centigrade. However, there is a downside, which Seffrin explains, “…is that infrared equipment is unable to see through most objects.”