CN204821318U - On -vehicle ponding degree of depth detection alarm device based on PSD - Google Patents

Abstract

The utility model discloses a vehicle-mounted water depth detection and alarm device based on PSD. The device is installed on the front bumper of the vehicle and comprises a PSD detection module, a data control processing module and a display and alarm device. It uses semiconductor lasers for active lighting, adopts laser triangulation method PSD distance measurement, uses the reflection and refraction of water objects, and does not need to probe into the water to obtain the depth of water in front of the vehicle in time, and has depth display and alarm functions. Wireless communication is adopted between the device and the display alarm device. The cost is low, the assembly is simple, the overall detection device is simplified, the volume is small, and the operation method is simple and fast.

Description

A vehicle-mounted water depth detection and alarm device based on PSD

technical field

The utility model relates to a vehicle-mounted water depth detection and alarm device based on PSD, in particular to a display and alarm device for real-time measurement of road surface water depth in muddy or turbid waters, belonging to the technical field of measurement and measurement and control devices.

Background technique

Urban roads caused by torrential rains are severely waterlogged, and these waterloggings can easily cause vehicles on the road to stall, cause property damage to the masses, and even threaten life safety. Because it is difficult for the driver to judge the depth of the water, especially at night, it is easy to take the risk of wading the vehicle into the water, causing the engine to stall, and some drivers will get out of the car to investigate in person, which not only brings trouble to the driver, but also easily causes traffic accidents. accidents, and even casualties. In response to this situation, at present, the traffic control department has also made corresponding measures, such as placing road signs for reminders, and monitoring road sections in real time. Yet this method is only a kind of passive reminding mode after all, and the driver still can't understand the stagnant water situation of driving section in time at the first time. Existing waterlogging depth monitoring methods and devices, such as using resistive liquid level gauges, water level sensors, etc., all need to place the equipment in the water for measurement, or to know in advance the road sections where waterlogging may occur, which is also difficult at night Let the driver know the depth of the water in a timely manner, and there are also problems such as inconvenient use and high cost of the measuring device. On the other hand, muddy water and turbid water are likely to cause large measurement errors, and flowing water can easily wash away existing measuring devices. The invention patent "Laser-Based Ship Draft Measuring Device and Its Measurement Method" (CN102530197A) discloses that a hollow sealed straight tube with transparent windows at both ends is used as a carrier for laser propagation direction conversion, and the measurement with an underwater probe is attached. The method and device, the structural device cannot be used in the real-time measurement and alarm scheme of road water depth.

According to the principle of the laser particle size analyzer, the laser beam can penetrate the suspension. Based on the laser emitting and receiving device based on the principle of PSD laser triangulation, the reflected light intensity received by the PSD will be absorbed by the suspended particles in the measured water. It is weakened by scattering, but only need to increase the output power of the laser to meet the requirements, and the depth of the water generally does not exceed the stroke of the complete absorption of the laser, and the PSD can receive the light reflected from the bottom of the water. Of course, due to the influence of scattering, when the water is deep and very turbid, the measurement accuracy is relatively reduced, but for the safe driving of the driver, the accuracy error of the centimeter level can fully meet the requirements.

Contents of the invention

The purpose of this utility model is to design a kind of vehicle-mounted water depth detection alarm device based on PSD in view of the problems raised by the background technology. device. It uses semiconductor lasers for active lighting, adopts laser triangulation method PSD distance measurement, and uses the reflection and refraction of light from water objects. It does not need to probe into the water to obtain the depth of water in front of the vehicle in time, and has depth display and alarm functions. The cost is low, the assembly is simple, the overall detection device is simplified, the volume is small, and the operation method is simple and quick.

In order to achieve the above object, the utility model adopts the following scheme:

A vehicle-mounted water depth detection and alarm device based on PSD, comprising a water depth detection device and a display alarm device, the water depth detection device is installed on the front bumper of the car, and the display alarm device is placed inside the car; it is characterized in that:

The water depth detection device includes: a PSD detection module and a data control processing module, and the PSD detection module is used to emit laser signals and obtain reflected laser signals;

The data control processing module includes: a single-chip microcomputer and peripheral circuits, which are used to process input and output signals, calculate the depth of accumulated water, and are also used to control the A/D conversion unit, and wirelessly communicate with the display alarm device; the peripheral circuits include current and voltage A conversion circuit, the current-voltage conversion circuit is used to convert the weak circuit signal output by the PSD into a voltage signal and filter and amplify it, and then transmit it to the signal input terminal of the single-chip microcomputer;

The display alarm device includes: control the start and stop buttons of the water depth detection device, display the water depth screen in real time, and a sound and light alarm function module when the water depth exceeds a safe value; the sound and light alarm function module includes a beeper Chime and LED lights;

There is wireless communication between the display alarm device and the water depth detection device;

The PSD detection module includes: a semiconductor laser module with active illumination, a collimator lens with adjusted laser output, a receiving lens and PSD, the receiving lens and PSD are used to receive the reflected laser beam; the axis of the laser output laser, The optical axis of the receiving lens and the PSD are located on the same plane, and the laser output laser and the PSD form a triangular distance measurement.

The working principle of the PSD-based vehicle-mounted water depth detection and alarm device of the utility model is:

When the driver encounters water accumulation on the road ahead while driving, he turns on the start button on the display alarm device to activate the on-board water accumulation depth detection and alarm device. After entering the water, it is projected onto the road to form a reflected beam, and refracted out of the water surface again. After exiting the water surface, it is transmitted to the PSD detection module through the receiving lens as a sensing signal. The electrical signal output by the PSD accurately reflects the distance information transmitted by the beam received by the sensor. The PSD output current signal, through the data control processing module, is first converted into an appropriate small voltage signal by the current-voltage conversion circuit, and then amplified, controlled by a single-chip microcomputer for A/D conversion, reading the conversion result, and calculating the water-logged road surface From the distance information, subtract the distance between the device and the water surface to obtain the water depth value. When the measured water depth is greater than the depth that causes the vehicle to break down, an alarm signal is sent and wirelessly transmitted to the display alarm device in the car.

The beneficial effects of the utility model are:

⑴Using PSD and single-chip microcomputer as the main detection chip, active lighting by semiconductor laser, simple and fast detection and alarm in day and night, low cost, high measurement accuracy, simple assembly, overall simplification of detection device, greatly reduced size; depth display And alarm module, the operation method is simple and quick.

⑵ Laser triangulation method PSD distance measurement is adopted, and the reflection and refraction of light by water objects is used. There is no need to put the detector deep into the water, and the requirements for industrial waterproof level can be appropriately relaxed, which reduces the difficulty and cost of device packaging and design.

⑶ Strong practicability, able to obtain the depth of water in front of the vehicle in time to avoid accidents.

Description of drawings

Fig. 1 is a schematic diagram of the installation position of the vehicle-mounted water depth detection and alarm device based on PSD according to the embodiment of the present invention;

Fig. 2 is a schematic block diagram of the vehicle-mounted water depth detection and alarm device based on PSD.

Detailed ways

Below in conjunction with accompanying drawing, the utility model embodiment is further described:

As shown in Figure 1 and Figure 2, the utility model is a vehicle-mounted water depth detection and alarm device based on PSD; it includes two parts: a water depth detection device and a display alarm device, wherein the water depth detection device is installed on the front bumper of the car, and the display alarm The device is a handheld unit placed inside the car. The water depth detection device includes: a PSD detection module and a data control processing module, and the PSD detection module is used for emitting laser signals and acquiring reflected laser signals.

The data control processing module includes: a single chip microcomputer and peripheral circuits, which are used to process input and output signals, calculate the depth of accumulated water, control the A/D conversion unit, and realize wireless communication with the display and alarm device. The peripheral circuit also includes a current-voltage conversion circuit. The current-voltage conversion circuit is used to convert the weak current signal output by the PSD into a voltage signal, filter and amplify it, and then transmit it to the signal input terminal of the single-chip microcomputer for calculation and processing by the single-chip microcomputer.

The display alarm device includes: controlling the start and stop buttons of the water depth detection device, a real-time display screen for the depth of accumulated water, and an audible and visual alarm function module when the depth of the accumulated water exceeds a safe value; the audible and visual alarm function module is a buzzer and LED lights remind drivers that the water is too deep to pass.

In the embodiment of the utility model, the communication between the display alarm device and the water depth detection device is wireless communication, such as WI-FI communication.

The PSD detection module includes: a semiconductor laser module with active illumination, a collimator lens with adjusted laser output, a receiving lens and PSD, the receiving lens and PSD are used to receive the reflected laser beam; the axis of the laser output laser, The optical axis of the receiving lens and the PSD are located on the same plane, and the laser output laser and the PSD form a triangular distance measurement.

When the utility model works, the laser refracts the laser beam through the water surface to the road surface under the water through the collimating lens, and the reflected light will form the final reflected beam after being refracted by the water surface, which will be used as a sensing signal and converged on the receiving lens. On the PSD, the distance information of the road surface under the accumulated water can be obtained by calculation, and the depth value of the accumulated water can be obtained by subtracting the distance between the device and the accumulated water surface. The laser triangulation ranging method can effectively shield the direct reflected light beam on the water surface, so as to realize the direct measurement of the detection device on the water surface.

Before starting the detection, first measure and record the signal generated by the background light, then control the laser to emit the beam, collect the signal through the gate, then subtract the background signal in the software, calculate the specific depth value according to the formula, and calculate the depth value Compared with the safety value of the accumulated water depth that causes the car to break down, when the accumulated water depth exceeds the safe value, an alarm is activated.

Referring to Fig. 1, in the utility model embodiment, the computing process of data control processing module is as follows, by single-chip computer control PSD module works with gate mode, after starting, at first receive background light beam, measure the signal intensity that it produces, then laser Launch the laser, in order to avoid the interference of reflected light on the surface of the accumulated water, after waiting for a period of time (where: c is the speed of light), start to capture the reflected light beam, when the signal is obtained, send it to the single-chip microcomputer, and the distance value z measured by PSD Subtract the distance from the laser to the water surface to obtain the depth of the ponded water.

In the embodiment of the utility model, the reflected light intensity received by the PSD will be weakened due to the absorption and scattering of the suspended particles in the measured water, and the method of enhancing the output power of the laser can meet the accuracy requirements, and the measurement accuracy error in practical applications The value is about ±2cm, which can fully meet the requirements.

The above are only embodiments of the present utility model, but are not intended to limit the present utility model. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present utility model shall be included in the scope of the present utility model. within the scope of the claims.

Claims (2)

1., based on a vehicle-mounted depth of accumulated water detection alarm device of PSD, comprise depth of water detecting device and displaying alarm, described depth of water detecting device is arranged on vehicle front bumper/spoiler, and described displaying alarm is positioned over automotive interior; It is characterized in that:

Described depth of water detecting device comprises: PSD detecting module, Data Control processing module, and described PSD detecting module is used for Emission Lasers signal and obtains the laser signal of reflection;

Described Data Control processing module comprises micro controller system and peripheral circuit, for the treatment of input/output signal, calculated product water depth, also for control A/D converting unit, and with displaying alarm radio communication; Described peripheral circuit comprises current-to-voltage converting circuit, and the faint circuit signal that described current-to-voltage converting circuit is used for PSD exports is converted to voltage signal and after filter and amplification, is resent to micro controller system signal input part;

Described displaying alarm comprises: control the start and stop button of described depth of water detecting device, in real time display depth of accumulated water screen, sound and light of alarm module when depth of accumulated water exceedes safety value; Described sound and light of alarm module comprises buzzer phone and LED;

Radio communication between described displaying alarm and depth of water detecting device.

2. a kind of vehicle-mounted depth of accumulated water detection alarm device based on PSD as claimed in claim 1, is characterized in that:

Described PSD detecting module comprises: the semiconductor laser module of band active illumination, the collimating lens of band adjustment Laser output, receiver lens and PSD, and receiver lens and PSD are for receiving the laser beam be reflected back; The described axis of laser Output of laser, the optical axis of receiver lens and PSD three are positioned at same plane, and laser Output of laser and PSD form range of triangle.