CN109813426A - Utilization of the ultraviolet imagery technology on unmanned aerial vehicle - Google Patents

Abstract

Ultraviolet imager is suitable for shooting to reaching the electric discharge image after some strength, as offline, intuitive electric discharge observation；Using ultraviolet imager, we can observe more apparent shelf depreciation, corona, electric arc, its shooting image is intuitive and easy to carry, and work is convenient, be very suitable to and polling transmission line and take photo by plane；The core devices of ultraviolet imager are the Ultraviolet sensors of front end, Ultraviolet sensor is a staple product in photon technology device, it is a kind of with high sensitivity and corresponding light-detecting device of ultrafast time, can be widely applied to the fields such as photon counting, atomic weak light detection；The pulsed mode of Ultraviolet sensor is suitable for short time or disposable measurement dim light time；Ultraviolet imager can be divided into based on spectrum switch technology, be based on gleam image intensifier, several based on AlGaN photodetector etc..

Description

Utilization of the ultraviolet imagery technology on unmanned aerial vehicle

Technical field

When the present invention is considered point source, line source, face source with UV source, the calculation method of the ultraviolet light irradiation degree of use It is different；Any radiation source all has having the dimensions, it is impossible to be a simple geometric point；So-called point source, line Source, face source, which are also not according to radiation source size, to be divided, but the survey of instrument whether is full of according to the area of radiation source Measure visual field；The calculating of amount of radiation is all built upon in an experiment carries out in situation known to radiance N, and in general work In Cheng Yingyong, the calculating of the radiance of radiation source is very crucial.

Background technique

At present corona discharge detection technique mainly have visual observation, infrared thermal imaging technique, ultrasonic corona Detection Techniques, Ultraviolet image method etc.；Since the target of corona discharge is small, intensity is weak, visually method is difficult to observe；And contain in sunlight Very strong infrared ray, it is higher with infrared thermal imager observation false detection rate, and response speed when infrared thermal imager detection corona discharge Degree is slow；Ultrasonic corona Detection Techniques can effective orientation discharge source, but its sensitivity is not high and is difficult to discharge characteristics and puts Electric strength judged, and since sound wave decays in route of transmission, it is serious to distort, so sound detection cannot reflect electric discharge substantially The size of amount；Ultraviolet imagery technology has the characteristics that not contact, is not influenced by High-frequency Interference, high sensitivity, and not by traffic The influence of condition and human factor, therefore it is more suitable for the detection of power equipment corona discharge situation, so that develops herein is defeated Electric line cruising inspection system has selected ultraviolet imager to detect each transmission facility corona discharge situation in transmission line of electricity as taking photo by plane Main means.

Summary of the invention

Solution of the invention can use radiation intensity J, radiosity W and radiation with a UV radiation source Flux P describes its strong and weak and energy spatial distribution；The definition of radiation intensity is radiation of the radiation source in unit solid angle Power reflects the spatial distribution of Radiation transport；Radiosity is all radiant powers that unit swept area issues, Reflect the surface density of radiation-emitting；Radiation flux makes power of the entire radiation source to spatial emission, that is, the radiation energy emitted Time speed；Another important definition is radiance N；Radiance is radiation source along direction of visual lines unit projection face The power that product is radiated to unit solid angle；Illumination and light source perpendicular to the light direction of propagation the direction light intensity at just Than with square being inversely proportional for light source to surface distance, here it is the square distance laws of reciprocity of illumination.

Specific embodiment

The present invention implements as follows: it is irradiated by bias light (including visible light, infrared light, ultraviolet light etc.) in UV signal source Afterwards, be divided into two kinds from the light that signal source is transferred to imaging lens: one is the ultraviolet lights of signal source itself radiation, another is The bias light of signal source reflection；Imaging beam passes through after ultraviolet imagery camera lens, some bias light is filtered out, some Bias light still has；Then light beam passes through blind type optical filter again, on the photocathode for shining ultraviolet imagery booster, passes through After the enhancing of ultraviolet enhancer, signal is amplified and is converted into visible light signal output, and then imaging beam is by taking the photograph Camera ICCD, is finally output to after signal processing and observes and records equipment.

Claims (1)

1. the ultraviolet light image that the present invention is signal source to be obtained itself radiation, it is necessary to filter out bias light；Utilize broadband ultraviolet Light optical filter can filter out visible light and infrared light in bias light；Ultraviolet light in bias light mostlys come from the spoke of the sun It penetrates, in the 240-280nm wave band of ultraviolet light, solar radiation is completely by the Ozone Absorption in atmosphere, i.e., in this wave band Background radiation in atmosphere is zero, and we term it " day are blind "；So if wanting the ultraviolet light in wiping out background light and not Influence the ultraviolet light image of signal source, it is necessary to select the ultraviolet narrow band filter of " day is blind " type；In ultraviolet imagery detection system, Since ultraviolet radioactive is generally fainter, if directly with detecting weaker UV signal to the sensitive ICCD of ultraviolet light, due to The intensity of UV signal is too small, often detect less than；In order to solve this problem, enhancing amplification first is carried out to UV signal, Then it detects again；It is proper using ultraviolet imaging enhancer in order to realize the enhancing amplification of ultraviolet signal.