Spectroscopic measurement of radiation of high-pressure mercury discharge lamps

Abstract

Compact size and high efficiency are important features for projection systems. As the most often used sources for projection optics, short arc lamps are characterized by their impressive economy and the ability to produce extremely bright light from small dimensional sources. In this contribution the old principle of back reflection towards the sources is applied to a high-pressure mercury discharge lamp with a reflector to improve the radiance of the source by 35% at a certain reduced solid angle. Increasing the optical thickness of sources is equivalent to reducing the total phase space (etendue) of emitted radiation by the same factor, which is very useful for compacting sources. In addition, by comparing the forward radiation and the back-reflected radiation obtained from spectroscopic measurements, we calculate the absorptivity, emissivity, absorption, and emission coefficients of the plasma of the arc lamp based on Kirchhoff’s Law and Planck’s equation which is necessary for determining its temperature and pressure.

Light recycling characteristics of ultra-bright lamps

“…Recycling lamp emission back to an ultra-small (mm scale) plasma arc source is a simple and potentially effective strategy for brightness enhancement (Fig 1). Although light recycling in plasma lamps is not uncommon, to our knowledge experimental reports on its effectiveness and its dependence on plasma thermodynamics are sparse, restricted to two recent studies of mercury short-arc discharge lamps 1,8 , both of which used a compact spherical retro-reflector. Commercial Xenon short-arc discharge lamps are viable alternatives due to their immense brightness and broadband emission, especially for medical applications where near-IR light is preferred due to deeper optical penetration in biological tissue.…”

Numerical Prediction of Influence of Gas Species on Gas Convective Pattern of Short Arc Lamp

“…The operating gas species is adequately selected depending on the application. Xe arc lamps [1][2][3][4] are mainly used as a light source for apparatus such as digital cinema projectors [5], searchlights [6] and solar simulators [7]. Kr arc lamps are used as the pump in solid-state lasers [8].…”

Φωτοκαταλυτικές Μέθοδοι Αποχρωματισμού Και Οξείδωσης Χρωστικών Ουσιών Σε Υδατικά Διαλύματα

“…Τέτοιοι λαµπτήρες χρησιµοποιούνται για φωτισµό δρόµων και εξωτερικών χώρων, αν και σταδιακά αντικαθίστανται. [Fu et. al., 2005] Μήκος κύµατος (nm) Οπτική απορρόφηση Σχήµα 3.4 :Φάσµα εκποµπής λυχνίας υδραργύρου υψηλής πίεσης [Fu et.…”

“…[Fu et. al., 2005] Μήκος κύµατος (nm) Οπτική απορρόφηση Σχήµα 3.4 :Φάσµα εκποµπής λυχνίας υδραργύρου υψηλής πίεσης [Fu et. al., 2005] Λυχνία Ξένου Στο εσωτερικό αυτών των λαµπτήρων υπάρχει αέριο ξένο.…”