CN204373610U - The optical signal transmitter of non-contact road surface situation sensors - Google Patents
The optical signal transmitter of non-contact road surface situation sensors Download PDFInfo
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- CN204373610U CN204373610U CN201420772956.9U CN201420772956U CN204373610U CN 204373610 U CN204373610 U CN 204373610U CN 201420772956 U CN201420772956 U CN 201420772956U CN 204373610 U CN204373610 U CN 204373610U
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Abstract
The utility model discloses a kind of optical signal transmitter of non-contact road surface situation sensors, this optical signal transmitter one_to_one corresponding on launching seat is provided with at least two lightening holes and luminophor, the wavelength of optical signal that each luminophor is launched is different, and the diversing lens by arranging between the inherent luminophor of lightening hole, the light signal that each luminophor is launched is after diversing lens refraction, the light signal of each luminophor divergence part can be made to be parallel to each other, be convenient to optical signal receiver and receive the light signal be reflected back from above-mentioned light area, thus ensure the reflected light signal data of the corresponding different wave length light signal of at least two groups that optical signal receiver collects, according to the scattering strength of each light signal on the coverture of road surface, judge the type of coverture on road surface, and calculate the concrete numerical value of the thickness of coverture on road surface according to revised langbobier law, improve accuracy and the precision of road pavement condition detection.
Description
Technical field
The utility model relates to pavement behavior detecting sensor technical field, particularly relates to a kind of optical signal transmitter of optical signal sensor of non-contact road surface situation sensors.
Background technology
At present, for detecting humidity, ponding, accumulated ice, the accumulated snow situation on road surface, adopt touch sensor more, namely need sensor placement under road surface, by gathering the conductance of coverture on road surface, and by the Signal transmissions that collects to central processing unit, thus acquisition pavement behavior, in actual use, under needing incision road surface that sensor is imbedded road surface, rear very difficult removal is imbedded, not easily repair and maintenance, and along with jamming on down for a long time of vehicle, there will be sagging situation, thus there is increasing deviation in the signal that sensor is collected.
Application number be 201020684452.3 Chinese utility model patent disclose a kind of detector with laser generator and echo receiver bidirectional regulating mechanism for positions, this detector comprises frame, frame is equiped with optical signal transmitter, optical signal receiver and signal processing apparatus, optical signal transmitter is to the target location Emission Lasers on road surface, the signal be reflected back from road surface target location is received by optical signal receiver, and be delivered to after signal processing apparatus processes, obtain the information about pavement state, but when determining pavement behavior, the signal that mistake optical signal receiver can only be received is strong and weak, compared with signal when other signals or face, main line, water layer on road surface is drawn by experience is fuzzy, the situation of ice sheet or snow deposit, accurately cannot obtain water layer, the concrete data of ice sheet or snow thicknes, thus make the pavement behavior poor accuracy that obtains.
Utility model content
The purpose of this utility model is to provide a kind of optical signal transmitter obtaining the non-contact road surface situation sensors of the concrete data of concrete mantle thickness, is intended to improve the accuracy of detection of existing detector to mantle thickness.
In order to realize above object, the technical scheme that the utility model adopts is:
The technical scheme of the optical signal transmitter of non-contact road surface situation sensors of the present utility model is as follows:
The optical signal transmitter of non-contact road surface situation sensors, comprise launching seat, launching seat offers at least two lightening holes spaced apart, lightening hole extends along the longitudinal direction, the front opening of all lightening holes, rear end are equiped with the luminophor for launching different wave length light signal respectively, luminophor and luminous one_to_one corresponding are arranged, and in lightening hole, be equiped with the diversing lens be parallel to each other for the light signal making luminophor launch before being in luminophor.
The axis of each lightening hole is parallel to each other, and diversing lens is in the front opening of transmitting aperture.
Described transmitting main body is connected with the power valve before being in transmitting aperture; power valve extends along the light path of the rear light signal of diversing lens refraction; the front opening of all transmitting apertures is in the back-end ports of power valve, and in power valve, be equiped with the protection lens for shutoff power valve being in and launching before main body.
Described power valve is the heat pipe be made up of Heat Conduction Material, power valve is equiped with for the well heater by power valve heated protective lens.
The side of described transmitting main body is hinged on the back-end ports place tube wall of power valve, the other end is provided with for the rear end ring end face of the leading flank and power valve strutting transmitting main body, to regulate the emission angle adjusting mechanism of angle between the two.
Described emission angle adjusting mechanism comprise the periphery, bar portion for being located in adjusting bolt on housing and adjusting bolt is installed from front and back backward successively before setting nut, spacer and rear setting nut, the bar portion of adjusting bolt is passed from the adjustment through hole that described transmitting main body side is offered, and rear setting nut and spacer separate the both sides, front and back being in described adjustment through hole.
Be equiped with between described transmitting main body and setting nut and be set in spacer on periphery, adjusting bolt bar portion or spring, the two ends of described spacer or spring coordinate with the front aperture edge of described threaded hole and the rear end end face block of setting nut respectively.
The periphery of described power valve is convexly equipped with the gear of the annular after being in opening edge, on the periphery of power valve coaxial threaded be connected with and be in opening before for housing is pressed on annular gear along on lock sleeve, described housing is fixed on the periphery of power valve by lock sleeve, and between lock sleeve and housing, install the grommet type seals be set on power valve periphery.
Described power valve away from the protective cover launching one end coaxial sleeve of main body and be provided with tubulose, the front end of described protective cover is stretched out from the front end of power valve, and the front end surface of protective cover is on the inclined-plane that tilts from front to back.
The utility model one_to_one corresponding on launching seat is provided with at least two lightening holes and luminophor, the wavelength of optical signal that each luminophor is launched is different, and the diversing lens by arranging between the inherent luminophor of lightening hole, the light signal that each luminophor is launched is after diversing lens refraction, the light signal of each luminophor divergence part can be made to be parallel to each other, be convenient to optical signal receiver and receive the light signal be reflected back from above-mentioned light area, thus ensure the reflected light signal data of the corresponding different wave length light signal of at least two groups that optical signal receiver collects, according to the scattering strength of each light signal on the coverture of road surface, judge the type of coverture on road surface, and according to revised langbobier law, [Ln (os/dp)=ε d+k wherein dp is the reflected light signal under dry pavement behavior, os is reflected light signal when having coverture situation, d is mantle thickness, ε is the absorbed scale-up factor of light, and it is relevant with the character of absorbing material and the wavelength X of incident light, k is the constant relevant with the condition such as road surface] calculate the concrete numerical value of the thickness of coverture on road surface, improve accuracy and the precision of road pavement condition detection.
Accompanying drawing explanation
Fig. 1 is the principle of work schematic diagram of the utility model embodiment;
Fig. 2 is the light path arrangement schematic diagram of the utility model embodiment;
Fig. 3 is the structural representation of the utility model embodiment;
Fig. 4 is the structural representation of optical signal transmitter in Fig. 3.
Embodiment
The embodiment of the optical signal transmitter of non-contact road surface situation sensors of the present utility model: as shown in Figures 1 to 4, this sensor comprises apparatus main body and frame 14, and apparatus main body is made up of rain cover 1, housing, optical signal transmitter 4 and optical signal receiver 13.Housing is surrounded by the forward and backward housing 3,7 of capping respectively on the main casing 2 of the tubular extended along the longitudinal direction and the front and back end port of main casing 2, to make housing for box-type hollow-core construction.Optical signal transmitter 4 and optical signal receiver 13 are all fixed on procapsid 3, and optical signal transmitter 4 has the power valve 45 that the launching seat 41 be in housing is connected with launching seat 41 front end, optical signal receiver 13 has the receiving tube that the reception main body 131 be in housing is connected with reception main body 131 front end one, power valve 45 and receiving tube extend all along the longitudinal direction, in the spaced and parallel difference of above-below direction, and pass from the opening that procapsid 3 is offered, be provided with the transmitting protective cover 5 of tubulose at the coaxial sleeve respectively that to pass in part of power valve 45 and receiving tube and receive protective cover 12, the front end of two protective covers is exposed from the front end of power valve 45 and receiving tube respectively, and the front end ring end face launched protective cover 5 and receive protective cover 12 is on the inclined-plane of retracting backward gradually from top to bottom.The housing that rain cover 1 extends for front and back, and be located at above housing, optical signal transmitter 4 and optical signal receiver 13, so that housing, optical signal transmitter 4 and optical signal receiver 13 are wrapped in its internal cavities.The upper end of frame 14 is fixed on main casing 2, and lower end is for being fixed on the object such as electric pole, trees near road surface.
Optical signal transmitter 4 comprises expelling plate 6, launching seat 41, power valve 45 and the transmitting protective cover 5 arranged successively from back to front.Expelling plate 6 is fixed on the rear end face of launching seat 41, and on expelling plate 6, be provided with four luminophors 63,64,65,66, these four luminophors 63,64,65,66 are the laser diode that expelling plate is arranged, the infrared laser wavelength that wherein the 3rd and the 6th luminophor 63,66 sends is 1280 ~ 1340nm, the infrared laser wavelength that 4th luminophor 64 sends is 1400 ~ 1460nm, and the infrared laser wavelength that the 5th luminophor 65 sends is 1500 ~ 1560nm.Launching seat 41 offers the lightening hole arranged with four luminophor one_to_one corresponding, the through hole that this lightening hole extends before and after being, and with the 3rd, four, five luminophors corresponding the 3rd, four, five lightening holes are pre-large post-small shoulder hole, the straight hole that six lightening hole corresponding with the 6th luminophor extends before and after being, 3rd, four, diversing lens 410 is equiped with respectively in the aperture, front end of five lightening holes, the 3rd, four, the hole wall at aperture, the front end place of five lightening holes is convexly equipped with annular table terrace forward, the rear end face of diversing lens 410 coordinates with described annular table terrace block, diversing lens 410 is in part in annular table terrace endoporus for for by the 3rd, four, the infrared laser that five lightening holes are launched is refracted to the light transmission part in the light path that is parallel to each other, the front end face of launching seat 41 is fixed with diversing lens compressing tablet 42 by trip bolt, diversing lens compressing tablet 42 offers three transmittings distributed with aperture, four lightening hole front ends one_to_one corresponding to bore a hole, with third and fourth, transmitting that five lightening holes the are corresponding rear stomidium of boring a hole along coordinating with the front end face block of diversing lens 410 and getting out of the way the light transmission part of diversing lens 410, the power valve 45 corresponding with the 6th lightening hole is controlled and is pre-large post-small taper hole and coaxially arranges with the 6th lightening hole.Be fixed with contiguous block 43 and lower connecting block 411 in the both sides up and down of launching seat 41 respectively by trip bolt, the front end of upper contiguous block 43 is stretched out from the front end of launching seat 41, and the twisted axis 44 that extension extends around left and right is hinged on the rear end tube wall of power valve 45, lower connecting block 411 is for having the L shape contiguous block of horizontal side wall and upright side walls, the horizontal side wall of lower connecting block 411 is fixed on by trip bolt on the downside of launching seat 41, upright side walls is in the below of launching seat 41, and in the upright side walls of lower connecting block 411, be provided with emission angle adjusting mechanism, this emission angle adjusting mechanism comprises the setting nut that the periphery, bar portion of adjusting bolt 413 and setting nut is installed from front to back successively, spacer 415 and set nut, the bar portion of adjusting bolt 413 is passed from the bolt through-hole that the front and back that procapsid 3 is offered extend, to stretch in the cavity of housing, stretch into part to pass from the adjustment through hole that the front and back that lower connecting block 411 is offered extend, to stretch out from the aperture, rear end of adjustment through hole, set nut revolves and is located at adjusting bolt 413 from the part that lower connecting block 411 was uploaded, and coordinate along block with the rear side hole of described adjustment through hole, the regulating sleeve 416 be set on periphery, adjusting bolt 413 bar portion is equiped with, the inwall of regulating sleeve 416 and the outer peripheral face clearance fit in adjusting bolt 413 bar portion in adjustment elongated hole, spacer 415 is set in adjusting bolt 413 bar portion and is on the portion perimeter between lower connecting block 411 and procapsid 3, and the rear and front end of spacer 415 coordinates respectively at the front aperture edge of described adjustment through hole and the rear end face block of setting nut, setting nut revolves on the portion perimeter that is located between adjusting bolt 413 bar portion spacer 415 and procapsid 3, and the front end face of setting nut coordinates along block with the rear stomidium of bolt through-hole on procapsid 3.Power valve 45 is from being inserted on opening that procapsid 3 offers, and on the periphery of procapsid 3, be processed with the annular gear edge be in after procapsid 3 and the external thread be in before procapsid 3, annular gear coordinates along being in parameatal rear end face part block with procapsid 3, be connected with by described external thread coaxial threaded on the periphery of power valve 45 and launch lock sleeve 47, the grommet type seals be set on power valve 45 is folded with between transmitting lock sleeve 47 and procapsid 3, and will be fastened on the periphery of transmitting lock sleeve 47 by coaxial threaded for the protection of the transmitting protective cover 5 launching camera lens, and make protective cover pass through launch lock sleeve 47 be fixed on the periphery of power valve 45, the transmitting protection lens 49 of shutoff power valve 45 endoporus are equiped with in power valve 45, launch protection lens 49 to coordinate with the annular boss block of projection on power valve 45 inwall, and coaxial threaded is connected with the emission and anti-dust cover 48 being in and launching before protection lens 49 in power valve 45, transmitting protection lens 49 are pressed on described annular boss by emission and anti-dust cover 48, protect lens 49 to be fixed in power valve 45 by emission and anti-dust cover 48 to make transmitting, the inner end face of power valve 45 is connected by screw and is fixed with power valve well heater 412, this power valve well heater 412 heats transmitting protection lens 49 by power valve 45.
In the present embodiment third and fourth, five luminophors 63,64,65 irradiate assigned address on road surface by three diversing lens 410, form three and opposing parallel show up 10, for the qualitative and quantitative analysis of road surface 120 state, and the 6th luminophor 66 not scioptics, the angle of divergence is larger, comparatively large by the particles effect in air, the compensating approach of testing result is carried out for detecting visibility.The stable infrared laser of predetermined power is launched in four luminophor timesharing in turn with the modulating frequency of 1K, infrared laser forms by road surface 120 and its coverture the rear orientation light comprising abundant information, rear orientation light converges on the photodiode 88 on dash receiver 8 by receiver lens 132, light signal is converted into electric signal, processor is entered again through amplification, filtering, rectification, AD sampling, the mathematical model utilizing experiment to set up carries out qualitative and quantitative analysis, exports road surface 120 situation detection result.
In use, by tightening gib screw sensor is fixed on the electric pole in roadside, light pole or tree limb, and by adjusting base and the first to the 3rd adjustment seat, make sensor and 120 one-tenth, road surface proper angle, and according to the adjusting bolt 413 on measuring distance adjustment optical signal transmitter 5, namely make showing up of on expelling plate 6 three luminophors 10 all drop in the reception window 110 of optical signal receiver 13 by emission angle adjusting mechanism; Carry out dry demarcation time dry on road surface 120, obtain trepang number DP1, DP2, DP3, once the change such as sensing station angle all can cause dry Parameters variation, need to re-start dry demarcation; When each condition is constant, trepang number is relatively stable, and sensor has dry signal automatic regulating function, and compensation road surface 120 and camera lens pollute the trace change of the trepang number caused; When each condition does not change, once road surface 120 humidity, ponding, freeze, accumulated snow, incident light 180 due to blanket surface 210 of showing up reflect and hydrone and solid particle to the absorption of light signal and scattering acting in conjunction, three back reflected lasers 200 of surveying show different features, can differentiate road surface 120 state according to the magnitude relationship of three signals, the cover material according to judging enters different thickness equations; Absorbance according to material can calculate mantle thickness, the measuring error that measure theory basis adopts three wavelength measurements can reduce coverture granularity etc. to cause for the Lambert-Beer's law revised, and measures more accurately than Single wavelength.
Such as filter out three IR wavelengths λ 1=1280 ~ 1340nm, λ 2=1400 ~ 1460nm, λ 3=1500 ~ 1560nm according to road surface 120 situation water absorption spectrum, ice absorption spectrum, snow scattering spectrum, due to blanket surface 210 of showing up reflect and hydrone and solid particle to the absorption of light signal and scattering acting in conjunction, the performance of surveying the backscatter signal arrived is as follows, wherein water being mainly reflection and absorbing, backscattering coefficient ε 11> ε 13> ε 12 three wavelength; Ice is to the backscattering coefficient ε 21> ε 22> ε 23 of three wavelength; The backscattering coefficient ε 31> ε 32> ε 33 of snow to three wavelength; According to size and the difference of three back reflected lasers 200 and the ratio of the dry optical signal in road surface 120, can qualitative analysis road surface 120 situation quantitatively detect water ice-snow thickness.
Mantle thickness measure equation is derived as follows:
Ln (Io/I)=ε Cd----formula 1
In formula 1: Io----incident light 180 intensity;
I----is by the transmitted intensity after sample;
Ln (Io/I)----be called absorbance;
C----is sample concentration, and what we measured is pure material water, C=1;
D----is light path;
ε----be the absorbed scale-up factor of light, it is relevant with the character of absorbing material and the wavelength X of incident light 180.
The principle formula being applicable to this sensor is:
Ln (os/dp)=ε d+k----formula 2
In formula 2: the dry signal of dp----;
Os----has light signal during coverture;
D----mantle thickness;
K----constant, the impact of the conditions such as road surface 120.
Actual absorptivity is unknown, is to return from a large amount of test neutral lines to obtain, the derivation of equation:
Table one, water-ice snow absorptivity chart
Dry demarcation signal: DP1, DP2, DP3; Received signal strength: OS1, OS2, OS3; Water ice-snow thickness: d1, d2, d3.
Separate:
Analysis result: because Ln (DP/OS) and mantle thickness have linear relationship, so select multiple linear regression analysis method to analyze data, obtains β xx and constant term K.
As known from the above, as long as there are enough representational data, just can obtain 3 groups of coefficients of corresponding water ice-snow thickness, reach material and distinguish the object with detect thickness, therefore the present embodiment achieves based on the infrared spectral characteristic of water, ice, snow, the non-cpntact measurement of road surface 120 situation, data acquisition unit is based on embedded microprocessor technical design, realize the data sampling to each layer sensor, remote command control, data computing, quality control, communication and transmission, and by mass storage expansion technique, realize storage and the transmission of data record.
In addition, the present embodiment, according to practical application needs, adds automatic dry calibrating function, interfering data rejects algorithm, automatic temperature-adjusting function, cleanliness measuring ability.The light signal of the dry pavement collection in nearest 1 hour is averaged as trepang number by described automatic dry calibrating function; Described interfering data is rejected algorithm and is utilized segmentation statistical method, a small amount of jump signal caused is rejected by vehicles or pedestrians; The difference of the laser diode temperature that described automatic temperature-adjusting function measures according to thermistor and 20 DEG C, carries out ladder adjustment to the heater heating power on optical signal transmitter 5, until find a heating power that can keep temperature stabilization.
As known from the above, as long as there are enough representational data, just can obtain 3 groups of coefficients of corresponding water ice-snow thickness, reach material and distinguish the object with detect thickness, therefore the present embodiment achieves based on the infrared spectral characteristic of water, ice, snow, the non-cpntact measurement of road surface 120 situation, data acquisition unit is based on embedded microprocessor technical design, realize the data sampling to each layer sensor, remote command control, data computing, quality control, communication and transmission, and by mass storage expansion technique, realize storage and the transmission of data record.
In the above-described embodiments, optical signal transmitter has protective cover respectively, and the front-end port of protective cover is set to angle, to avoid extraneous light, pollutant and sleet to the infringement of optical signal transmitter and optical signal receiver camera lens, in other embodiments, the protective cover of optical signal transmitter and optical signal receiver also can be integrated into a large protective cover, is arranged in the larger protective cover one end mouth of pipe of caliber by the camera lens of optical signal transmitter and optical signal receiver; Or removal protective cover, directly uses optical signal transmitter and optical signal receiver self to carry out corresponding optical detection.
In the above-described embodiments, by the lock sleeve on power valve, both are fixed on procapsid, and by Gask-O-Seal to sealing gap when being fixedly connected with, reach the effect of waterproof, in other embodiments, power valve and receiving tube also can be fixed on procapsid by modes such as welding, rubber seals, and reach the object of water-tight.
In the above-described embodiments, by arranging bucker on a sensor, so that optical signal transmitter and optical signal receiver cover are established, reach the object of shield light signal projector and optical signal receiver, in other embodiments, also can remove bucker, utilize the eaves at sensor mounting location place or sunshading board to cover optical signal transmitter and optical signal receiver.
In the above-described embodiments, emission angle adjusting mechanism is made up of adjusting bolt, front setting nut, rear setting nut and spacer, to be reached the object of accurate adjustment by the rotation of adjusting bolt, in other embodiments, spacer also can replace with spring, to realize soft readjustment; Or whole emission angle adjusting mechanism is replaced by the distance adjusting mechanism that pinion and rack, cylinder, hydraulic cylinder etc. are conventional; Or remove this emission angle adjusting mechanism, make the emission angle of optical signal transmitter be a fixed angle, thus make the utility model be applicable to fast install in specific environment.
In the above-described embodiments, power valve is all equiped with well heater, with by power valve heated protective lens, avoids the frosting of protection lens, in other embodiments, also can remove this well heater, and the utility model is installed in the less working environment of the temperature difference.
In the above-described embodiments, four lightening holes are parallel to each other, the light sent to make four luminophors reflects the object that just can reach light path and be parallel to each other by simple, in his embodiment, four lightening holes also can stagger certain angle mutually, like this by the angle of light emission lens in adjustment lightening hole, the light signal that just four luminophors can be made to distribute is parallel to each other.
In the above-described embodiments, the wavelength of the three kinds of different infrared lasers adopted is respectively λ 1=1280 ~ 1340nm, λ 2=1400 ~ 1460nm, λ 3=1500 ~ 1560nm, in other embodiments, from above langbobier law, the light signal by any three kinds of different wave lengths calculates the thickness of coverture on road surface.
In the above-described embodiments, the light signal of three kinds of different wave lengths is adopted to carry out, water, ice, the identification of snow type and the determination of thickness, in other embodiments, when only there is the coverture of water and snow two types in sensor surveyed area, can only use the light signal of two kinds of different wave lengths just can identify cover type, and the thickness of coverture in measuring, by that analogy, therefore the concrete quantity of luminophor in the utility model, determines according to the type summation that the coverture on road surface in actual testing environment may occur.
Claims (9)
1. the optical signal transmitter of non-contact road surface situation sensors, it is characterized in that, comprise launching seat, launching seat offers at least two lightening holes spaced apart, lightening hole extends along the longitudinal direction, the front opening of all lightening holes, rear end are equiped with the luminophor for launching different wave length light signal respectively, and luminophor and luminous one_to_one corresponding are arranged, and in lightening hole, be equiped with the diversing lens be parallel to each other for the light signal making luminophor launch before being in luminophor.
2. the optical signal transmitter of non-contact road surface situation sensors according to claim 1, is characterized in that, the axis of each lightening hole is parallel to each other, and diversing lens is in the front opening of transmitting aperture.
3. the optical signal transmitter of non-contact road surface situation sensors according to claim 1 and 2; it is characterized in that; described transmitting main body is connected with the power valve before being in transmitting aperture; power valve extends along the light path of the rear light signal of diversing lens refraction; the front opening of all transmitting apertures is in the back-end ports of power valve, and in power valve, be equiped with the protection lens for shutoff power valve being in and launching before main body.
4. the optical signal transmitter of non-contact road surface situation sensors according to claim 3, is characterized in that, described power valve is the heat pipe be made up of Heat Conduction Material, power valve is equiped with for the well heater by power valve heated protective lens.
5. the optical signal transmitter of non-contact road surface situation sensors according to claim 3, it is characterized in that, the side of described transmitting main body is hinged on the back-end ports place tube wall of power valve, the other end be provided with for strut launch the leading flank of main body and power valve rear end ring end face, to regulate the emission angle adjusting mechanism of angle between the two.
6. the optical signal transmitter of non-contact road surface situation sensors according to claim 5, it is characterized in that, described emission angle adjusting mechanism comprise the periphery, bar portion for being located in adjusting bolt on housing and adjusting bolt is installed from front and back backward successively before setting nut, spacer and rear setting nut, the bar portion of adjusting bolt is passed from the adjustment through hole that described transmitting main body side is offered, and rear setting nut and spacer separate the both sides, front and back being in described adjustment through hole.
7. the optical signal transmitter of non-contact road surface situation sensors according to claim 6, it is characterized in that, be equiped with between described transmitting main body and setting nut and be set in spacer on periphery, adjusting bolt bar portion or spring, the two ends of described spacer or spring coordinate with the front aperture edge of described threaded hole and the rear end end face block of setting nut respectively.
8. the optical signal transmitter of non-contact road surface situation sensors according to claim 6, it is characterized in that, the periphery of described power valve is convexly equipped with the gear of the annular after being in opening edge, on the periphery of power valve coaxial threaded be connected with and be in opening before for housing is pressed on annular gear along on lock sleeve, described housing is fixed on the periphery of power valve by lock sleeve, and between lock sleeve and housing, install the grommet type seals be set on power valve periphery.
9. the optical signal transmitter of non-contact road surface situation sensors according to claim 3; it is characterized in that; the protective cover being provided with tubulose away from one end coaxial sleeve launching main body of described power valve; the front end of described protective cover is stretched out from the front end of power valve, and the front end surface of protective cover is on the inclined-plane that tilts from front to back.
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| CN110896663A (en) * | 2018-05-31 | 2020-03-20 | 深圳市大疆创新科技有限公司 | Infrared emission angle adjusting structure, infrared emission module and remote control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110896663A (en) * | 2018-05-31 | 2020-03-20 | 深圳市大疆创新科技有限公司 | Infrared emission angle adjusting structure, infrared emission module and remote control device |
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