In theory, if a beam is completely parallel and fits within the aperture of a sensor, then it should make no difference at all what the distance is it will be the same number of photons (ignoring absorption by the air, which is negligible except in the UV below 250nm).
See the user manual for further information on how to use the user threshold. It is recommended always to set the user threshold to the minimum possible setting to retain best energy accuracy in any given situation. However, with longer laser pulse widths, the minimum energy will be higher, rising to approximately twice the user threshold level when the laser pulse width is equal to the sensor pulse width setting. If the laser pulse width is less than 1/2 the setting, the minimum energy corresponds to the setting. Pulses below this energy level will trigger the sensor down to the user threshold level, but accuracy is compromised.įor pulse width settings above ~0.25ms, accuracy is good all the way down to the threshold. For pulse width settings below ~0.25ms, the minimum energy that can be measured accurately is approximately 40% above the user threshold setting. The trigger level can be adjusted up to 25% of full scale, however operation depends on the pulse width setting. Increasing the threshold will prevent triggering on noisy signals and allow accurate measurment of energy and frequency, as long as the laser pulses are larger than the noise. The show will begin around Thanksgiving, and the display time will be 5:30pm till 11:00pm.The Pyro-C sensors have a "user threshold" feature allowing the user to adjust the measurement threshold in noisy environments. Darian Foust bolting a base for one of the tree displays. This will be the fifth year for the show, and there will be some changes this year some new lights and displays. Hill is the guy who puts the show together and tweaks the program to make sure the music and just the right lights work together. Frankie Dople and Brian Leach string lights on the fence around the park. The build up time to have everything set up is about three days, but it is about a two week project getting things ready before the site build. Garrett Hill of Pyro Shows, with help from Lafollette Public Works and Lafollette Parks & Recreation, is into the second day of about a three day job to get Freeman Park ready for the Christmas light show.Īccording to Hill, this year’s display will have more than 2,500 lights in assorted colors of red, white, blue and green. LAFOLLETTE, TN (WLAF) – The annual Pyro Shows Christmas light show is almost ready to light up your Christmas spirit. Garrett Hill (center), Darian Foust and Michael Medley discussing a display layout for the Pyro Shows Christmas light show. TOP PHOTO: Adam Hutson positions the stakes for the sidewalk light runs for the Pyro Shows Christmas light show.
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