CN1114726A - Reflector matching xenon lamp for airport runway searchlight - Google Patents

Abstract

The present invention relates to a reflector matched for xenon lamp for airport runway searchlight. It uses an ultra-high voltage D.C. short arc xenon lamp as light source, and combines it with multiparameter parabolic reflector to obtain the preset exit light beam diffusion angle of 0.1-5 deg. Said curved reflector of the searchlight uses the following parameters to determine its multiparameter paraboloid:diffusion angle=0.1-5 deg., and focal length f=40-200 mm. It has the high light utilization ratio, obvious energy-saving effect, reduced overall size of whole body and colour temp. approaching to sunlight spectrum, so that it improves the equipment maneuverability and landing condition for night flight aircraft.

Description

The reflective mirror of matching xenon lamp for airport runway searchlight

The present invention relates to optical mirror, belong to G02b17/00 class and used light source, a kind of reflective mirror of matching xenon lamp for airport runway searchlight.Existing this series products be with the carbon arc lamp as light source, be combined into the spotlighting system with the standard parabolic reflector, its principle of work is seen accompanying drawing 1.The carbon arc lamp outgoing beam spread angle after reflection that is positioned at parabolic reflector 1 focal point F is 2.5～3 °, to guarantee that certain light beam thickness is arranged on runway.Then, the beam level direction is drawn back (17 °, 30 °) left to the right, made runway in whole wide region, obtain good illumination by cylindrical mirror 3.Necessary lighting condition when this is aircraft landing.But the greatest drawback of this system is owing to adopted the bigger carbon arc lamp in luminous zone, impel the focal distance f of reflective mirror and bore correspondingly to increase, and effective wrapping angle of reflective mirror is very little.This has just caused complete machine structure huge, and light utilization efficiency is very low.Because carbon arc lamp is also followed when work and is sent harmful smog, not only pollutes camera lens but also healthy extremely harmful to operating personnel.

The reflective mirror that the purpose of this invention is to provide a kind of light utilization efficiency height, matching xenon lamp for airport runway searchlight that equipment size is little.

The reflective mirror of this matching xenon lamp for airport runway searchlight constitutes the spotlighting system by light source and parabolic reflector, it is characterized in that:

A, light source adopt xenon lamp, and reflective mirror is the paraboloidal optical reflector of curved surface of multiparameter, xenon source is placed on the focus of optical reflector of curved surface, and its outgoing beam spread angle is 0.1 °～5 ° a scope;

The curved surface of b, this curved reflector is to be fulcrum with the focus, and para-curve is rotated a △ angle, a new curve occurs, and this new curve has just constituted the multiparameter parabola to the formed commentaries on classics curved surface of wandering of optical axis; The optical reflector of curved surface of c, searchlight limits the multiparameter parabola with following parameter:

△=0.1 °～5 ° of focal distance f=40～200mm

The light source power of d, xenon lamp is 500～15000w.

Baby plane, particularly military aircraft, itself is not with lighting device.During aircraft landing, the seachlight of irradiation runway must have 2.5 °～3 ° spread angle whole fuselage height could be placed light beam.For satisfying this lighting requirement, make device little and flexible again as far as possible, this system has adopted the most outstanding modern light source--superhigh voltage DC xenon short-act lamp.Its advantage is the luminescence efficiency height, point source character is strong, colour temperature (5600 ° of k) is near solar spectrum and use easy to operate.Because the xenon lamp luminous zone is minimum, as parabolic reflector and its combination to use always, its outgoing beam spread angle can only reach at most about 2 °, can't satisfy the requirement of this purposes.Reflective mirror outgoing beam spread angle of the present invention can reach 0.1 °～5 ° when being used for aircraft landing, light source power but uses original 2/3, but outgoing beam intensity increases more than 30%, energy-saving effect is remarkable, and raising illumination light intensity, and, make whole lighting system structure dwindle one times because the reflective mirror bore has reduced half, strengthened the motor-driven function of using.Because the colour temperature and the solar spectrum of xenon lamp are very approaching, utilize the searchlight of this many optical reflector of curved surface can make runway when night flight with daytime the sun irradiation identical visual effect is arranged, improved the landing condition of night-operating aircraft from face.

The present invention designs the multiparameter parabolic reflector and has obtained desirable outgoing beam spread angle.Illustrate below in conjunction with accompanying drawing:

Accompanying drawing 1 is the spotlighting system diagram of prior art;

Accompanying drawing 2 is the paraboloidal formation synoptic diagram of reflective mirror multiparameter of the present invention;

Radiation of light source synoptic diagram when accompanying drawing 3 is out of focus;

One, the paraboloidal design of multiparameter

1, the paraboloidal formation of multiparameter

The multiparameter parabola is developed by parameter △ angle of the parabolic adding of standard.With reference to Fig. 2, curve

Be to be the para-curve of pole axis with op.F is its focus.Now be fulcrum with F, will

Change the △ angle in the counterclockwise direction.Then curve by Forward to , pole axis is forwarded to by op , be axis of symmetry with op, Wander and change curved surface and just be called the multiparameter parabola.Thereby draw, when light source is positioned at F, increase the △ angle when spread angle of folded light beam is more parabolic than standard.

2, the polar equation of curved surface $R=\frac{2f}{1-\cos (\mathrm{\ψ}-\mathrm{\Δ})}---\[1\]$ In the formula; The R-radius vector, ψ-polar angle

3, the parametric equation of curved surface

Wherein XY is the coordinate of curved surface in rectangular coordinate system

Two, the paraboloidal optical design of multiparameter

The optical design procedure of multiparameter parabolic reflector (1) is the paraboloidal focal distance f that at first settles the standard.This is to the calculating of beam spread angle α and β when a series of f value of hypothesis.Wherein the α angle is meant light beam angle (counterclockwise) above optical axis, β represents the angle (clockwise direction) of light beam below optical axis, when satisfying relational expression u=α+Δ=3/2 °, and focal distance f during Δ ≈ 1/2 β and Δ have just been determined the elementary structure parameter of curved surface, can satisfy the requirement of beam spread angle 2u 〉=3 °.Simultaneously, can make the illuminating bundle center have enough radiation intensity.

The computing formula of beam spread angle α and β is provided by following, with reference to Fig. 3.

1, when light source is positioned at focus (Δ f=0), then has $\mathrm{\α}=\mathrm{\β}=\mathrm{si}{n}^{-1\[\frac{r}{f+x}\]}---\[3\]$ At this moment, spread angle is symmetrical in optical axis up and down.

2, when light source apicad during out of focus,

3, when light source to away from the summit out of focus time

Wherein: γ is a light source luminescent district radius, and xy is the coordinate of light beam at the reflective mirror incidence point.Generally speaking, Δ f is the defocusing amount of light source.When y=1/2d, has maximum α angle.D is the reflective mirror center-hole diameter.

After obtaining suitable f and Δ, curved surface is just determined fully, as for other parameter of reflective mirror, for example: and wrapping angle, bore, the degree of depth etc., can design routinely and carry out.

Three, explain above-mentioned [3], [4], [5] formula by an example 1; When light source adopts 7000w superhigh voltage DC xenon short-act lamp, γ=1mm then, xenon lamp cell-shell diameter is ∮ 75mm, requires f 〉=75/2+15mm=52.5mm (cell-shell and reflective mirror should have the distance of 15mm at least).When requiring beam spread angle 2u 〉=3 °, by a series of computings that above-mentioned [3], [4], [5] formula carry out, the result gets f=58m, when Δ f=0.5mm, and α=1.16 °, β=-0.63 °, when getting Δ=0.34 °, 2u=3 °.The external diameter ∮ 480mm of reflective mirror, wrapping angle ω=120 °.

The aircraft landing artificial moonlight system of this invention compares with existing product CT-90 type landing area floodlight, and when light source power is reduced to 7000w by original 11700w, and outgoing beam intensity increases more than 30%.The reflective mirror bore reduces half.

Example 2; This optical system can also enlarge range of application, and such as being used for outdoor scene illumination at night or field lighting etc., can select xenon lamp power as required is w=500～15000; The xenon lamp cell-shell diameter ∮=30～150mm corresponding with it, therefore, the focal range of reflective mirror is Δ=0.1 °～5 °.By method of designing optical system provided by the invention, can obtain good illuminating effect equally.

Claims (1)

1, a kind of reflective mirror of matching xenon lamp for airport runway searchlight constitutes the spotlighting system by light source and parabolic reflector, it is characterized in that:

A, light source adopt xenon lamp, and reflective mirror is the paraboloidal optical reflector of curved surface of multiparameter, xenon source is placed on the focus of optical reflector of curved surface, and its outgoing beam spread angle is 0.1 °～5 ° a scope;

The curved surface of b, this curved reflector is to be fulcrum with the focus, will run 4 thing lines and rotate a △ angle, a new curve occurs, and this new curve has just constituted the multiparameter parabola to the formed commentaries on classics curved surface of wandering of optical axis;

The optical reflector of curved surface of c, searchlight limits the multiparameter parabola with following parameter:

△=0.1 °～5 ° of focal distance f=40～200mm

The light source power of d, xenon lamp is 500～15000w.

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