Views: 0 Author: Site Editor Publish Time: 2022-09-14 Origin: Site
high speed imaging
In high-volume, high-speed applications, pulsing illumination at the appropriate speed to prevent motion blur in images requires the use of dedicated illumination controllers. Constant-current lighting controllers not only allow the light to be pulsed, but also enable overdrive, that is, driving the LED with short pulses of current above a specified maximum to increase the output intensity of the light. This is especially useful when, under normal operating conditions, there is not enough light intensity to obtain sufficient image detail. These lighting controllers are available with a choice of output channels to drive multiple light sources when needed and ensure consistent light output per pulse, a key requirement to ensure repeatability in machine vision measurements. High-speed in-line inspection requires very fast strobe lighting to avoid motion blur.
Machine vision lighting manufacturers have developed high-power stroboscopic light sources specifically designed for these high-speed inspections. The brightness of these light sources varies from 2 million lux to 10 million lux. When strobed, they are noticeably brighter than standard lights. Available in a variety of form factors, they offer very high illumination intensities, with less than 1µs response time from trigger input to maximum light emission, and ultra-fast strobes.
Not only does the high brightness provide the illumination intensity needed for these extremely short strobing strokes, but it also allows the use of smaller apertures to improve depth of field. Machine vision inspection is a powerful tool in the pharmaceutical and medical device industries. Each specific application requires the right lighting to make target information clearly visible and enable inspection to achieve the required speed, consistency, uniformity and accuracy. As the range of LED lighting configurations expands, having the support and advice of a machine vision lighting expert is critical to ensuring the best possible lighting solution.
