The irradiance Ee (“e” for energetic) or radiant flux density is the total power of electromagnetic energy passing through a surface and is a radiometric quantity. It correctly describes the “intensity” of lighting in image processing. The SI unit is W/m² (=power per area) In order to quantify the “intensity” for lighting in the visible […]
Jitter is any deviation or shift in the signal pulses in a high-frequency digital signal or irregularities in a signal. The deviation can relate to the amplitude, the phase time or the width of the signal pulse. The causes of jitter include electromagnetic interference (EMI) and crosstalk with other signals. The strength of the permissible […]
A Lambert spotlight is a physically ideal spotlight whose radiance (or luminance) is constant in all directions, i.e. completely diffuse. A Lambertian material appears equally bright regardless of the viewing direction. A black spotlight in particular is a Lambert spotlight. The Lambert radiator is described by Lambert’s law. Typical Lambert emitters are light-emitting diodes(LEDs) without […]
English for “Light Amplification by Stimulated Emission of Radiation”‘ Light amplification by stimulated emission of radiation. Laser lighting can be used to achieve special types of lighting for industrial image processing, such as structured lighting. The beam of the laser can take on various shapes, which, with the exception of the point or line shape, […]
Triangulation is the determination of distances by measuring angles within triangles using trigonometric functions. If a laser point(one-dimensional measurement) or a laser line (two-dimensional measurement; light section method) is projected at an angle onto an object, the line or point is offset depending on the height of the object. The offset is a measure of […]
The latency time (switch-on behavior) or typical LED switch-on delay describes the time required to switch on the lighting from the arrival of the trigger signal to approx. 90% brightness. This is caused by capacitance in the electronics, the LED cable (the longer the cable, the higher the capacitance and therefore the flash delay) and […]
Abbr. for “light emitting diode”, light emitting diode, luminescent diode. Is installed in LED lighting in industrial image processing. LEDs are virtually wear-free. Ageing (several 10,000 h) reduces their luminosity somewhat. Strong (local) heating causes LEDs to age more quickly. Sufficient cooling must therefore be ensured. Typical LED spectra (source: Vision Doctor). Depending on the […]
Due to the diode characteristic of LEDs, even a small change in the supply voltage results in a large change in the diode current. In addition, the diode characteristic curve depends on the temperature of the LEDs. Therefore, an LED that is operated at too high a voltage without current limitation can quickly self-destruct(thermal runaway). […]
