CN102072466A

CN102072466A - LED light source-based optical system of precision approach path indicator

Info

Publication number: CN102072466A
Application number: CN2010106037745A
Authority: CN
Inventors: 葛爱明; 魏敏晨; 王巍
Original assignee: Fudan University
Current assignee: Fudan University
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2011-05-25

Abstract

The invention belongs to the technical field of optics, in particular to a light-emitting diode (LED) light source-based optical system of a precision approach path indicator. The optical system consists of a reflector-containing red-light LED array, a reflector-containing white-light LED array, a right-angle prism and an aspherical mirror, wherein the collimated red-light LED array and the collimated white-light LED array are arranged opposite to each other; the red-light LED array is above and the white-light LED array is below; the right-angle prism is positioned on a bisector plane of the red-light LED array and the white-light LED array; the aspherical mirror is arranged in front of the right-angle prism; and the right-angle edge of the right-angle prism is positioned on or near a focal plane of the aspherical mirror by adjusting the positions of the two LED arrays and the prism. The indicator using the optical system can transmit light beam signals which completely meet a relevant international standard so as to help a pilot to adjust a plane slope to land when approaches a path.

Description

Based on LED is the optical system of the precision approach path indicator of light source

Technical field

The invention belongs to optical technical field, be specifically related to a kind of can vectored flight person when approach path the correct optical system of adjusting the type aircraft precision approach path indicator of the aircraft gradient.

Technical background

At present the aircraft precise sea-way entering indication mechanism (PAPI) used of airport can provide 5 kinds of gradient signals as the pilot, is respectively: be higher than approach path, a little higher than approach path, at approach path, be lower than approach path and be lower than approach path slightly.The correct approach path gradient is 3 °.

System adopts 4 light fixtures that can send red white two kinds of color of light, and every desk lamp tool is that the optical unit of 3 cover optical axises on same horizontal plane formed.Optical unit adopt usually power be the halogen tungsten lamp of 200-300W as light source, by the optical system of forming by reflector, colour filter and convex lens, make the index signal of outgoing can reach relevant criterion.

According to MH5001-2006 civil airport movement area technical standard, People's Republic of China's civil aviation industry standard---the relevant criterion of precise sea-way entering indication mechanism technical conditions and US Federal Aviation Administration (FAA), the PAPI system need form horizontal direction ± 10 ° at 300 meters, the hot spot of vertical direction ± 4 ° ellipse, oval the first half is a white light, the latter half is a ruddiness, and the transition angle between ruddiness and the white light should be less than 3 minutes.

There is the defective of following several respects in the optical system of existing PAPI:

1 uses halogen tungsten lamp as light source, to produce the signal that meets the demands, and its power requirement is very high, thereby the operating cost of system is very high;

2 systems need long-play, and the life-span of halogen tungsten lamp is shorter relatively, thereby need the airport frequently more to change the bulb, and maintenance cost is also higher;

Error may appear in the signal that 3 reasons owing to light decay make system send after operation a period of time, to the landing generation potential safety hazard of aircraft;

4 owing to signal demand ruddiness and white light two parts, and system adopts Red lightscreening plate to produce ruddiness, has reduced the utilization rate of luminous energy in fact.

At above-mentioned defective, the present invention uses ruddiness array and white light LED array to replace halogen tungsten lamp as light source, reduces the energy consumption of system, the signal that system is sent meet the demands by optical design and improve its utilization rate to luminous energy.

Summary of the invention

The object of the present invention is to provide that a kind of luminous efficiency height, system energy consumption are low, the optical system of the aircraft precision approach path indicator of the accuracy of long service life, signal and good reliability.

The optical system of aircraft precision approach path indicator provided by the invention, by one group of white light LED array that contains the red-light LED array of reflector and contain reflector as light source, and a right-angle prism and an aspherical mirror composition; Wherein, staggered relatively through the red-light LED array and the white light LED array of collimation, ruddiness is last, and white light is following; Described right-angle prism is arranged on the bisector plane of red-light LED array and white light LED array, two right angle faces of this right-angle prism respectively with the collimation white light and ruddiness angle at 45, the right angle rib is forward; Before described aspherical mirror is positioned over right-angle prism, adjust the position of two led array and prism, make the right angle rib of right-angle prism be positioned at aspherical mirror the place, focal plane or near; The convex surface of this aspherical mirror outwardly.Its structure as shown in Figure 1.

The present invention has following characteristics:

1 usefulness LED reduces system energy consumption as light source, reduces operating cost;

2 use red-light LED to obtain red light beam, have changed the method for original use Red lightscreening plate, have improved whole system ground efficient;

3 utilize the characteristics that LED monochromaticjty is strong, the life-span is long, strengthen the accuracy and the reliability of signal, and reduce its maintenance cost.

The optical system of invention can be made precision approach path indicator.Can use some indicators to form the precise sea-way entering indication mechanism, help pilot's aircraft that lands.

Description of drawings

Fig. 1 is a schematic diagram of using the novel precise sea-way entering indicator optics system of LED.

Number in the figure: 1 for having the red-light LED array of reflector, and 2 for having the white light LED array of reflector, and 3 is right-angle prism, and 4 is aspherical mirror.

The specific embodiment

1, in order can to raise the efficiency, and obtain red white dichromatism light beam, system adopts red-light LED and white light LEDs as light source;

2, red-light LED array and white light LED array are formed by some red-light LED and white light LEDs that have reflector, by the effect of this reflector, make the light beam of outgoing all approach directional light;

3, two groups of led array through collimation are staggered relatively, ruddiness is last, and white light is following.On its bisector plane, place a right-angle prism, two right angle faces of this right-angle prism respectively with the white light and the ruddiness angle at 45 of collimation, the right angle rib is forward;

4, formation one horizontal light beam after the right-angle prism reflection, light beam the first half is a ruddiness, the latter half is a white light;

5, before right-angle prism, place an aspherical mirror, the convex surface of this aspherical mirror outwardly, face shape is as be tire tread, make light beam in the horizontal direction with the satisfied relevant international standard of the angle of visual field that vertical direction is launched;

6, adjust the position of two led array and right-angle prism, make the right angle rib of right-angle prism be positioned near the focal plane of aspherical mirror D; And aspherical mirror D is also as projection objective, and the dichromatism light beam according to certain angle of visual field and light distribution, and is throwed away in the requirement of 300 meters two color light transition region angles;

7, behind aspherical mirror, can outgoing satisfy the light beam of international standard, promptly form one or two color beam, the first half is a white light, the latter half is a ruddiness; Locate at 1000 feet (300m), the transition angle, center of red white dichromatism light beam less than 3 ', the edge transition angle less than 5 '; The beam level direction angle of visual field is ± 10 °, and the vertical direction angle of visual field is ± 4 °; The central light strength of white light is greater than 45000cd, and the ruddiness central light strength is greater than 15000cd, and in whole angular field of view, light distribution should be satisfied related request.

Claims

1. one kind is the optical system of the precision approach path indicator of light source with LED, it is characterized in that by one group of white light LED array that contains the red-light LED array of reflector and contain reflector as light source, and a right-angle prism and an aspherical mirror composition; Wherein, staggered relatively through the red-light LED array and the white light LED array of collimation, ruddiness is last, and white light is following; Described right-angle prism is arranged on the bisector plane of red-light LED array and white light LED array, two right angle faces of this right-angle prism respectively with the collimation white light and ruddiness angle at 45, the right angle rib is placed forward; Before described aspherical mirror is positioned over right-angle prism, adjust the position of two led array and prism, make the right angle rib of right-angle prism be positioned at aspherical mirror the place, focal plane or near; The convex surface of this aspherical mirror outwardly.

2. according to claim 1 is the optical system of the precision approach path indicator of light source with LED, it is characterized in that the outgoing after reflector alignment of red-light LED and white light LEDs, horizontal outgoing after the right-angle prism reflection, effect by aspherical mirror, the light beam of international standard is satisfied in final outgoing, promptly form one or two color beam, the first half is a white light, and the latter half is a ruddiness; At 1000 feet places, the transition angle, center of red white dichromatism light beam less than 3 ', the edge transition angle less than 5 '; The beam level direction angle of visual field is ± 10 °, and the vertical direction angle of visual field is ± 4 °; The central light strength of white light is greater than 45000cd, and the ruddiness central light strength is greater than 15000cd, and in whole angular field of view, light distribution should be satisfied related request.