CN215340408U - Vehicle-mounted rainfall detector based on infrared measurement technology - Google Patents
Vehicle-mounted rainfall detector based on infrared measurement technology Download PDFInfo
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- CN215340408U CN215340408U CN202121865722.5U CN202121865722U CN215340408U CN 215340408 U CN215340408 U CN 215340408U CN 202121865722 U CN202121865722 U CN 202121865722U CN 215340408 U CN215340408 U CN 215340408U
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Abstract
The utility model particularly relates to a vehicle-mounted rainfall detector based on an infrared measurement technology, which comprises an infrared transmitter and an infrared receiver, wherein the infrared transmitter is arranged outside a vehicle windshield, the infrared receiver is arranged in the vehicle windshield, and infrared rays emitted by the infrared transmitter are attenuated by an external air medium, a rainfilm, the vehicle windshield and an air medium in the vehicle and then are received by the infrared receiver. The rainfall measuring device is based on an infrared absorption measuring technology, the rainfall is estimated by measuring the thickness of a water film formed by rainfall, the measuring time is short, the precision is high, the rainfall measuring device can be arranged on a moving carrier, the rainfall measuring device has the advantages of small volume and easiness in installation, and meanwhile, the rainfall measuring device is low in power consumption, small in effective data volume and convenient to adapt to various types of vehicles.
Description
Technical Field
The utility model belongs to the technical field of vehicles, and particularly relates to a vehicle-mounted rainfall detector based on an infrared measurement technology.
Background
With the rapid development of the modern society, the demand of people on efficient and convenient traveling is increasing day by day, driving in rainy days is difficult to avoid, however, due to the fact that the rainfall cannot be accurately estimated by human eyes, the traveling of the vehicle is often subjected to a plurality of risks, such as misjudgment of rain, too fast traveling speed, slipping on a slope, no control of safe distance, difficulty in handling emergency situations and the like. Therefore, the development of the vehicle-mounted detection system for monitoring the rainfall in real time is of great significance.
The light is a transverse wave of electromagnetic waves, and has a wavelength ranging from 1nm to 1mm, and light having a wavelength ranging from 370nm to 780nm is called visible light, and its color is determined by the wavelength, and light having a short wavelength is called ultraviolet light, and light having a long wavelength is called infrared light. All objects have the property of changing the direction of light after receiving light, i.e. reflection, refraction and transmission phenomena. CN101153928A discloses an infrared absorbing film which is excellent in near infrared absorbing performance, high in visible light transmittance, excellent in light resistance and weather resistance, capable of suppressing deterioration of near infrared absorbing performance with time, and low in production cost.
A photoelectric sensor is a small electronic device that uses light waves as a carrier and can detect changes in the intensity of light received by the photoelectric sensor. The principle utilized by the photoelectric sensor is as follows: the light with certain wavelength emitted by the emitting part is reflected by the object to be measured or the lens, and then is received by the receiving part and converted into the required electric signal. After the 90 s, the optical technology and the application and development of new light sources have greatly improved the reliability and stability of data measured by using the optical principle, gradually realized the miniaturization, high reliability and high stability of the optical sensor, and the optical sensor is widely applied to the occasions requiring high precision. CN109596151A discloses a structure of a photoelectric sensor, which improves the operability and the installation of the photoelectric sensor. CN1760923A discloses a light-transmitting infrared detector, which comprises an infrared transmitting module, an infrared receiving module and an alarm host connected in series, wherein the detector adopts infrared detection beam data encryption, has strong protection capability to the whole anti-theft system, reduces the possibility of being shielded by other infrared light sources, and has strong anti-interference capability. CN306549138S discloses a groove type photo-sensor (LU670), which is designed to detect the existence or status of an object.
As the automobile enters thousands of households, the vehicle-mounted system is continuously perfected, and the comfort and the safety of the automobile are obviously improved. At present, infrared rain sensors on the market mainly utilize infrared light to irradiate the windshield, and then the windshield with raindrops with different areas has different reflection effects on the infrared light, so that the size of the rain intensity is roughly judged, the rain intensity is controlled, the rain wiping frequency of the windscreen wiper is controlled, and the automation of the rain sensing device is realized. The rainfall sensor is applied to some advanced vehicles, but the purpose of developing the sensor is not to accurately judge the size and the change of real-time rainfall, and when the rainfall is large and raindrops form a rainfilm in front of a windshield of an automobile, the rainfall sensor cannot be used for further refining the intensity of the rainfall.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a vehicle-mounted rainfall detector based on an infrared measurement technology, which adopts the following technical scheme:
a vehicle-mounted rainfall detector based on an infrared measurement technology comprises an infrared emitter and an infrared receiver, wherein the infrared emitter is mounted outside a vehicle windshield, the infrared receiver is mounted in the vehicle windshield, and infrared rays emitted by the infrared emitter are weakened by an external air medium, a rainfilm, the vehicle windshield and an air medium in the vehicle and then received by the infrared receiver;
the infrared emitter comprises an infrared emitting tube, a condensing lens, an optical fiber tube, an emitting head, a radiator, an infrared emitter shell and an emitter sucker, and the infrared emitting tube, the condensing lens and the optical fiber tube are all arranged in the infrared emitter shell; the infrared transmitting tube is connected with a vehicle power supply through an external lead and is used for emitting infrared rays; the condensing lens converts the infrared rays emitted by the infrared emission tube from a divergent state to a parallel state and transmits the infrared rays in the parallel state to the emission head along the optical fiber tube; the transmitting head is inserted from one end of the infrared transmitter shell and is coaxially fixed with the optical fiber tube; the emitter sucker is fixed at one end of the infrared emitter shell and is used for adsorbing and fixing the infrared emitter outside a vehicle windshield; the radiator is fixed at the other end of the shell of the infrared emitter and close to the infrared emitting tube and is used for guiding out extra energy generated by the infrared emitter during working so as to prolong the service life of the emitter;
the infrared receiver comprises a receiver sucker, a photodiode, an induced current processor, a band-pass filter, an analysis element, a data processing module and a communication module; the receiver sucker is fixed on the infrared receiver shell and used for sucking and fixing the infrared receiver on the inner side of a vehicle windshield; the photoelectric diode is used for receiving infrared rays emitted by the infrared emitter and converting infrared pulse signals into electric pulse signals, and the electric pulse signals are transmitted to the induction current processor by the lead; the inductive current processor is used for amplifying the electric pulse signal; the band-pass filter is used for carrying out frequency selection on the amplified electric pulse signals so as to filter interference signals; the analysis element is used for carrying out error correction on the electric pulse signals after frequency selection and obtaining the amplitude value; the data processing module calculates the thickness of the raincoats according to the radiance values and acquires rainfall intensity according to the thickness of the raincoats and the empirical data of rainfall; the communication module is used for sending the rainfall intensity acquired by the data processing module to the vehicle-mounted system; the infrared receiver is connected with a vehicle power supply through an external lead and is used for supplying power to each module in the infrared receiver.
Further, the infrared emission tube is composed of four infrared light emitting diodes.
Further, the emitter sucker is composed of a plurality of suckers which surround the emitter head and are fixed on the shell of the infrared emitter.
Further, the receiver suction cup is composed of a plurality of suction cups surrounding the photodiode and fixed on the infrared receiver housing.
Further, the photodiode is a semiconductor device composed of a PN junction having an area larger than that of the LED.
The utility model has the beneficial effects that: the utility model estimates the rainfall by measuring the thickness of the water film formed by rainfall based on the infrared absorption measurement technology, has short measurement time and high precision, can be arranged on a moving carrier (such as an automobile), has the advantages of small volume and easy installation, and simultaneously has low power consumption and small effective data volume, thereby being convenient for adapting to various types of vehicles.
Drawings
Fig. 1 is a schematic view of the installation position of the rainfall detector of the present invention.
Fig. 2 is a schematic view of a partial principle of the rainfall detector of the present invention.
Fig. 3 is a schematic structural diagram of the infrared emitter of the rainfall detector of the present invention.
Fig. 4 is a schematic structural diagram of the infrared receiver of the rainfall detector.
Fig. 5 is a schematic view of the work flow of the rainfall detector of the present invention.
The system comprises a vehicle windshield, a 2-infrared emitter, a 3-infrared receiver, a 4-rain film, a 5-infrared path, a 6-radiator, a 7-infrared emitter shell, an 8-infrared emitter tube, a 9-condenser lens, a 10-optical fiber tube, an 11-emitter sucker, a 12-emitter head, a 13-receiver sucker, a 14-photodiode, a 15-lead, a 16-induction current processor, a 17-band-pass filter, an 18-analysis element, a 19-data processing module and a 20-communication module.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The utility model provides a vehicle-mounted near-road rainfall detector which can provide real-time rainfall data for a driver of a motor vehicle in the driving process, and effectively reduce the risk of traffic accidents in rainy days. As shown in fig. 1 and 2, the present invention includes an infrared emitter 2 and an infrared receiver 3, the infrared emitter 2 is installed outside a vehicle windshield 1, the infrared receiver 3 is installed inside the vehicle windshield 1, and infrared rays emitted from the infrared emitter 2 are attenuated by an external air medium, a rainfilm 4, the vehicle windshield 1 and an air medium inside the vehicle and then received by the infrared receiver 3. Wherein, infrared emitter 2 and infrared receiver 3 all are located vehicle windshield 1 below corner department and small, so can not block driver's sight and receive when falling rain the influence of wiper work minimum.
The infrared emitter 2 and the infrared receiver 3 are respectively connected with an emitter sucker 11 and a receiver sucker 13 on the surfaces close to the windshield, so that the detecting instrument is fixedly adsorbed on the windshield 1 of the vehicle.
As shown in fig. 3, in the schematic structural diagram of the infrared emitter 2, the infrared emission tube 8 is composed of four infrared leds 14 for providing a sufficiently strong infrared beam radiation flux to the infrared receiver 3, and the infrared rays emitted from a certain wavelength band are converted from a divergent state to a parallel state by passing through a condenser lens 9 with a specific curvature, and then transmitted to the emission head 12 along the optical fiber tube 10, where the light radiation intensity E is emitted0Infrared rays of (1). In addition, the radiator 6 can lead out extra energy generated when the infrared emitter 2 works, and the service life of the emitter is prolonged. The emitter sucker 11 fixes the infrared emitter 2 outside the vehicle windshield 1, and the installation is convenient.
As shown in fig. 4, in the schematic structural diagram of the infrared receiver 3, the photodiode 14 is a semiconductor device composed of a PN junction having a large area relative to the LED, and is used for receiving the infrared rays penetrating through the rain film 4 and the vehicle windshield 1 and converting the infrared pulse signal into an electric pulse signal. The stronger the infrared light pulse signal absorbed by the photodiode 14, the greater the reverse current therethrough, i.e., the stronger the electrical pulse signal. The electric pulse signal is transmitted by a lead 15, and the radiance L is obtained after the interference signal is filtered by the amplification of an induction current processor 16 and the frequency selection of a band-pass filter 17 and then the correction error action of an analysis element 18.
As shown in FIG. 5, in order to eliminate the influence of sand, dust, strong wind and other weather factors, the infrared emitter 2 emits light when it is not rainingInfrared light penetrates a small amount of external air medium, a vehicle windshield 1 and a small amount of in-vehicle air medium, and is received by an infrared receiver 3, and the obtained infrared pulse signal is subjected to photoelectric conversion, signal amplification and impurity removal to obtain the radiance L0′，L0' subtract the initial standard value L of the system0The analysis element 18 corrects the radiance acquired during rainfall according to the revision error, which is the revision error under the influence of other weather factors.
The data processing module 19 calculates the rain film thickness h according to the radiance value L obtained by analyzing the original 18, and the relationship between the rain film thickness h and the radiance value L can be expressed as
In the formula, CdThe distance attenuation factor, i.e. the scale factor by which the illuminance of the light radiation is attenuated with increasing distance, depends on the distance from the emitter head 12 to the photodiode 14, TwsTransmittance of water film surface formed for rainfall, TgIs the transmittance, R, of the vehicle windshield 1bIs the reflectivity of the vehicle windshield 1, k is the extinction coefficient of the water body, E0And L is known, Cd、TWS、k、Tg、RbMay be approximated as a constant.
After the thickness of the raining film is obtained, the data processing module 19 obtains rainfall intensity according to the thickness of the raining film and the empirical data of rainfall, and the communication module 20 sends the rainfall intensity to the vehicle-mounted system for vehicle-mounted display or coordination to realize other driving assisting functions of the vehicle-mounted system, such as intelligent control of a wiper, early warning of driving in rainy days and the like.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may be made by those skilled in the art without departing from the principle of the utility model.
Claims (5)
1. A vehicle-mounted rainfall detector based on an infrared measurement technology is characterized by comprising an infrared emitter (2) and an infrared receiver (3), wherein the infrared emitter (2) is installed outside a vehicle windshield (1), the infrared receiver (3) is installed in the vehicle windshield (1), and infrared rays emitted by the infrared emitter (2) are received by the infrared receiver (3) after being weakened by an external air medium, a rainfilm (4), the vehicle windshield (1) and an air medium in the vehicle;
the infrared emitter (2) comprises an infrared emitting tube (8), a condensing lens (9), an optical fiber tube (10), an emitting head (12), a radiator (6), an infrared emitter shell (7) and an emitter sucker (11), and the infrared emitting tube (8), the condensing lens (9) and the optical fiber tube (10) are all arranged in the infrared emitter shell (7); the infrared transmitting tube (8) is connected with a vehicle power supply through an external lead and is used for emitting infrared rays; the condensing lens (9) converts the infrared rays emitted by the infrared emission tube (8) from a divergent state to a parallel state, and transmits the infrared rays in the parallel state to the emission head (12) along the optical fiber tube (10); the transmitting head (12) is inserted from one end of the infrared transmitter shell (7) and is coaxially fixed with the optical fiber tube (10); the emitter sucker (11) is fixed at one end of the infrared emitter shell (7) and is used for adsorbing and fixing the infrared emitter (2) on the outer side of the vehicle windshield (1); the radiator (6) is fixed at the other end of the infrared emitter shell (7) and is close to the infrared emitting tube (8) and used for guiding out extra energy generated when the infrared emitter (2) works so as to prolong the service life of the emitter;
the infrared receiver (3) comprises a receiver sucker (13), a photodiode (14), an induced current processor (16), a band-pass filter (17), an analysis element (18), a data processing module (19) and a communication module (20); the receiver sucker (13) is fixed on the shell of the infrared receiver (3) and is used for sucking and fixing the infrared receiver (3) on the inner side of the vehicle windshield (1); the photodiode (14) is used for receiving infrared rays emitted by the infrared emitter (2) and converting infrared pulse signals into electric pulse signals, and the electric pulse signals are transmitted to the induced current processor (16) through a lead (15); the inductive current processor (16) is used for amplifying the electric pulse signal; the band-pass filter (17) is used for carrying out frequency selection on the amplified electric pulse signals so as to filter out interference signals; the analysis element (18) is used for carrying out error correction on the electric pulse signals after frequency selection and obtaining the amplitude value; the data processing module (19) calculates the thickness of the raindrops according to the radiance value, and acquires rainfall intensity according to the thickness of the raindrops and the empirical data of rainfall; the communication module (20) is used for sending the rainfall intensity acquired by the data processing module (19) to the vehicle-mounted system; the infrared receiver (3) is connected with a vehicle power supply through an external lead and used for supplying power to each module in the infrared receiver (3).
2. A vehicle-mounted rainfall detector based on infrared measurement technology as in claim 1 wherein the infrared transmitting tube (8) is composed of four infrared light emitting diodes.
3. A vehicle-mounted rain detector based on infrared measurement technology according to claim 1, characterized in that the emitter suction cup (11) is formed by a plurality of suction cups surrounding the emitter head (12) and fixed to the infrared emitter housing (7).
4. A vehicle-mounted rain detector based on infrared measurement technology according to claim 1, characterized in that the receiver suction cup (13) is formed by a plurality of suction cups surrounding the photodiode (14) and fixed to the housing of the infrared receiver (3).
5. A vehicle mounted rain detector based on infrared measurement technique according to claim 1 characterized in that the photodiode (14) is a semiconductor device composed of a PN junction with area larger than that of the LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121865722.5U CN215340408U (en) | 2021-08-11 | 2021-08-11 | Vehicle-mounted rainfall detector based on infrared measurement technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121865722.5U CN215340408U (en) | 2021-08-11 | 2021-08-11 | Vehicle-mounted rainfall detector based on infrared measurement technology |
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| Publication Number | Publication Date |
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| CN215340408U true CN215340408U (en) | 2021-12-28 |
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| CN202121865722.5U Active CN215340408U (en) | 2021-08-11 | 2021-08-11 | Vehicle-mounted rainfall detector based on infrared measurement technology |
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- 2021-08-11 CN CN202121865722.5U patent/CN215340408U/en active Active
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Effective date of registration: 20221221 Address after: 201203 Floor 2, Building 5, No. 888, Bibo Road, Free Trade Pilot Zone, Pudong New Area, Shanghai Patentee after: Shanghai Changxing Information Technology Co.,Ltd. Address before: 210044 No. 219 Ning six road, Jiangbei new district, Nanjing, Jiangsu Patentee before: Nanjing University of Information Science and Technology |