CN111337100A - Water level measurement method and device based on bar water level scale - Google Patents

Abstract

The invention relates to a hydrological information collection technology. A water level measurement method based on a bar water level ruler, installs or draws a bar water level ruler in occasions such as channels and rivers that need to measure the water level; installs a laser scanning device at a suitable position facing the oblique upper part of the bar water level ruler; uses a laser The scanning device scans the unsubmerged part of the bar water level scale; according to the scanning result of the laser scanning device, the length of the unsubmerged part of the water level scale is identified and calculated, and then the length difference between the length of the entire water level scale and the unsubmerged part and the water level are calculated. The zero-point elevation of the ruler can be calculated to obtain the water level of the measured water body. A water level measuring device based on a bar water level scale, comprising a bar water level scale and a scanning host for the bar water level scale. The invention indirectly calculates the water level of the measured water body by scanning the length of the unsubmerged part of the bar-shaped water level scale by laser, the measurement principle is simple, the recognition effect is good, and the bit error rate is extremely low.

Description

Water level measurement method and device based on bar water level scale

technical field

The invention relates to a hydrological information collection technology, in particular to a new method and device/system for water level measurement of water bodies such as rivers, channels, reservoirs and lakes.

Background technique

Water level is the elevation of the free water surface of rivers, channels, reservoirs, lakes and other water bodies above a specified base surface. It is the most basic hydrological information collection project. The basic basis for the construction planning and design of urban water supply and drainage projects, which is directly applied to the determination of embankments, dam heights, bridges and culverts, the determination of road surface elevations, the design of reservoirs, weir gates, irrigation, drainage and other projects, and hydrological forecasting work based on this , to provide timely water information for the construction, operation and management of flood control and drought relief, irrigation, shipping and water conservancy projects. At the same time, water level measurement is also an important means of water management in irrigation areas, and channel water level is an important parameter for judging the working state of the canal and calculating the canal flow. In addition, water levels provide indirect information for inferring other hydrological data. According to the continuously observed water level records, the flow rate and its change process can be inferred through the relationship between the water level and the flow rate. The water level can also be used to infer the water surface gradient and the water storage capacity of rivers and lakes. As the most basic item of hydrological information collection, water level measurement is very important.

At present, there are two methods of water level measurement: manual measurement with water gauge and automatic measurement with self-recording water level gauge.

Manual measurement of water gauge is the most commonly used and most reliable water level measurement method. The method of manual measurement of the water gauge is: set up a water level gauge at a selected location, and manually observe the reading of the water level gauge directly at regular intervals. Adding the zero point elevation of the water level gauge is the water level. The water level gauge is a necessary basic facility. E-shaped water level gauge. The disadvantages of manual measurement of the water gauge are: poor efficiency, low precision, and time-consuming and labor-intensive.

With the advancement of electronic information and computer technology, the automatic measurement method of self-recording water level gauge is a high-tech that has developed rapidly in recent decades. At present, the commonly used self-recording water level gauges on the market include: float water level gauge, pressure water level gauge, magnetostrictive water level gauge, ultrasonic water level gauge, radar water level gauge, laser water level gauge and electronic water gauge, etc. The working principle of these self-recording water level gauges is to use various physical principles to sense changes in water level. Various types of water level gauges have their own advantages and disadvantages and applicable occasions, and they all have the problem of unintuitive water level measurement.

Therefore, in order to overcome the shortcomings of poor measurement efficiency, low accuracy, and time-consuming and laborious manual measurement of water gauges, and to better solve the problem of non-intuitive water level measurement by self-recorded water level measurement, a simple structure, high measurement accuracy, suitable for various It is a new and intuitive water level measurement method for various occasions, which has extremely high theoretical and practical value.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention proposes a water level measurement method and device/system based on a bar-shaped water level scale.

The water level measurement method and device/system based on the bar-shaped water-level ruler indirectly calculates the water level of the measured water body by scanning the length of the unsubmerged part of the bar-shaped water-level ruler by laser, the measurement principle is simple, and the scanning and recognition effect of the water level ruler is good. , the bit error rate is very low.

The technical scheme adopted in the present invention:

A water level measurement method based on a bar water level scale, the process includes: equipment installation process, information acquisition process and data processing process, 1) Install or draw bars that meet the accuracy requirements in the channels, river courses and other occasions where the water level needs to be measured Water level ruler; 2) Install a laser scanning device at a suitable position diagonally above the bar water level ruler; 3) Information acquisition process: use the laser scanning device to scan the part of the bar water level ruler that is not submerged by the water body; 4) Data processing process: The data processing device recognizes and calculates the length of the unsubmerged part of the water level scale according to the scanning results of the laser scanning device, and then calculates the length of the measured water body according to the difference between the length of the entire water level scale and the unsubmerged part, and the zero point elevation of the water level scale. water level.

In the water level measurement method based on the bar water level scale, the scale scale of the bar water level scale is divided into two precisions: 1 cm precision and 1 mm precision; the scale scale of the 1 cm precision is composed of 1 cm wide red. White or blue and white or black and white color bars whose length is equal to the width of the ruler; the scale scale with a precision of 1 mm is composed of 1 mm wide red and white or blue and white or black and white color bars whose length is equal to the width of the ruler stripe.

In the water level measurement method based on the bar-shaped water level scale, the data processing device identifies the part of the bar-shaped water level scale that is not submerged by the measured water body through laser scanning according to the different reflectivity of the water surface and the bar-shaped water level scale; The reflectivity of the scale scribing bars of different colors of the ruler is different. The number of scribing bars on the water level scale that is not submerged by the water body is identified by laser scanning, and then the bar water level ruler can be calculated according to the width of the scribing bars. The length of the part not submerged by the body of water.

The water level measurement method based on the bar-shaped water level scale, according to the different strengths of the reflected light signals received by the laser scanning device and reflected by the scales of different colors of the bar-shaped water level scale, the reflected light signals with different strengths are converted. The number of white and black or red or blue lines can be determined by measuring the number of pulsed digital signals 0 and 1, and then calculated according to the width of the scale. Find the length of the unsubmerged portion of the water level bar.

A water level measuring device/system based on a bar water level scale, comprising a bar water level scale and a bar water level scale scanning host, the bar water level scale is installed or drawn on the channels, river courses and reservoirs that need to measure the water level and other places; the bar-shaped water level scale scanning host includes a laser scanning module (2), a main control circuit (3), a wireless transmission module (4) and a power supply module (5), and the laser scanning module (2) outputs a signal The main control circuit (3) is connected; the wireless transmission module (4) is communicated with the main control circuit board (3).

The water level measuring device/system based on the bar-shaped water level scale, the main control circuit is composed of a microprocessor, a memory and a peripheral control circuit, the microprocessor is connected with the control circuit and the wireless transmission module, and the control circuit is connected with Laser scanning module; the microprocessor executes the following data processing program: according to the scanning result of the laser scanning device, identify and calculate the length of the unsubmerged part of the water level scale, and then according to the length of the entire water level scale and the length of the unsubmerged part The difference, and the zero point elevation of the water level scale, calculate the water level of the measured water body.

The laser scanning module is composed of five parts: a laser light source, an optical scanning system, an optical receiving system, a photoelectric converter and a code counter; the laser light source is connected with the optical scanning system, the optical receiving system is connected with the photoelectric converter, and the photoelectric converter is connected with Counter connection.

In the water level measuring device/system based on the bar water level scale, the laser scanning module (2), the main control circuit (3), the wireless transmission module (4) and the power supply module (5) of the bar water level scale scanning host are arranged Inside a rain-proof box body, the laser scanning module is arranged at the front end of the rain-proof box body.

Invention Beneficial Effects

1. The present invention is based on the water level measurement method of the bar water level scale, and for the first time proposes a "new water level measurement technology combining bar water level scale + laser scanning recognition technology", which can further promote the great progress and technological innovation of water level measurement technology. . The water level measurement principle is simple, the water level scale scanning and recognition effect is good, and the bit error rate is extremely low.

2. The water level measurement method of the present invention is based on a bar-shaped water level ruler, and the measurement accuracy is high. The ruler scale with an accuracy of 1 mm can achieve a precision of 1 mm when the water level ruler is installed vertically. When installed obliquely, the accuracy can be higher. If installed at an angle of 30 degrees, the accuracy can reach 0.5 mm.

3. The water level measuring device/system based on the bar-shaped water level scale of the present invention has the intuitive characteristics similar to the manual observation of the water scale, and is convenient for calibration. The scanning host is not in direct contact with the measured water body, the equipment is not easy to be corroded and damaged, and the service life is long.

Description of drawings

Fig. 1 is a schematic diagram of a water level ruler with a precision of 1 cm according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a water level ruler with a precision of 1 mm according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a scanning host according to an embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated, and they can be combined with each other to achieve better technical effects.

Example 1

The present invention is based on the water level measurement method of the bar-shaped water level scale, and the process of realizing the water level measurement includes:

Equipment installation process: 1) Choose a suitable location to install a bar water level scale that meets the accuracy requirements in the channels, rivers and other occasions where the water level needs to be measured; the bar water level scale can be installed vertically or at a certain angle. It can be installed on the wall of hydraulic structures or on the bank slope of river rocks, and can also be installed on piles. For occasions with low precision requirements, it can also be drawn directly on the walls of river rocks or hydraulic structures;

2) Install a laser scanning device at a suitable position facing the obliquely above the bar water level scale, connect with the laser scanning device, and set up a data processing terminal, which can be the bar water level scale scanning host, or a portable Computer or communication equipment; the laser scanning device can also be connected to the monitoring center by means of remote communication; the data processing terminal, the bar-shaped water level scale scanning host or the monitoring center installs a data processing program;

Information acquisition process: use the laser scanning device to scan the part of the bar water level scale that is not submerged by the water body, obtain the original data containing the water level information and send it to the data processing terminal or remote monitoring center;

Data processing process: The data processing terminal or remote monitoring center identifies and calculates the length of the unsubmerged part of the water level scale according to the scanning results of the laser scanning device, and then according to the length difference between the length of the entire water level scale and the unsubmerged part, and the zero point elevation of the water level scale , calculate the water level of the measured water body.

The data processing terminal stores the measurement results in the memory, and sends the results to the monitoring center through the wireless transmission module.

As shown in Figure 1 and Figure 2, the scale scale of the bar water level scale is divided into two precisions: 1 cm precision and 1 mm precision; the 1 cm precision scale scale consists of 1 cm wide red and white or blue and white or black and white The length of the interval is equal to the width of the ruler; the scale scale with a precision of 1 mm is delineated by a 1 mm wide color bar whose length is equal to the width of the ruler. Mark A in the figure is a red, blue or black scale bar, and B is a white scale bar.

The water level measurement method based on the bar-shaped water-level scale, according to the difference in reflectivity of the water surface and the bar-shaped water-level scale, identifies the unsubmerged part of the bar-shaped water level scale by means of laser scanning. According to the different reflectivity of the scale marking strips of different colors of the bar water level scale, the number of the marking strips of the water level scale that is not submerged by the water body is identified by laser scanning, and then according to the width of the scale marking strips, it can be calculated The length of the unsubmerged portion of the water level bar.

Example 2

The water level measurement method based on the bar water level scale of this embodiment is different from Embodiment 1 in that the data processing process specifically includes: according to the laser scanning device, the reflected light reflected by the scale description bars of different colors of the bar water level scale is received. The strength of the signal is different, and the reflected light signal with different strength is converted into a 0, 1 digital electrical signal. By measuring the number of pulse digital electrical signals 0, 1, the white and black characterization strips or the red characterization strips can be determined. The number of blue bars is then calculated from the width of the scale bars to calculate the length of the unsubmerged portion of the bar.

Example 3

This embodiment is an implementation of a water level measuring device/system based on a bar water level scale. The water level measuring device based on a bar water level scale includes a bar water level scale and a bar water level scanning host. Water level scales are installed or drawn in places such as channels, rivers, and reservoirs that need to measure water levels.

As shown in FIG. 3 , the bar-shaped water level scale scanning host includes a laser scanning module 2, a main control circuit 3, a wireless transmission module 4 and a power supply module 5, and the output signal of the laser scanning module 2 is connected to the main control circuit 3; The wireless transmission module 4 is connected in communication with the main control circuit 3 . The main control circuit consists of a microprocessor 6 , a memory 7 and a control circuit 8 . The microprocessor is connected with the control circuit and the wireless transmission module, and the control circuit is connected with the laser scanning module. The laser scanning module 2 , the main control circuit 3 , the wireless transmission module 4 and the power supply module 5 of the bar-shaped water level scale scanning host are arranged in a rain-proof box 1 , and the laser scanning module 2 is arranged at the front end of the rain-proof box 1 . The rain-proof box body includes a door, a lock and a buckle which is convenient to be installed on a vertical pole; the rain-proof box body can be made of plastic, stainless steel plate or iron plate with anti-rust paint.

Fig. 1 shows the bar water level gauge with 1 centimeter precision of the present invention. It is made by drawing a water gauge scale on the rocky bank slope of a river channel or on the wall of a hydraulic structure. The width of the bar water level scale is greater than 8 cm; A color bar scribe of length equal to the width of the ruler.

Fig. 2 shows the 1 mm precision bar water level scale of the present invention. The width of the water level ruler is greater than 8cm; the ruler scale is marked by a 1mm wide red and white or blue and white or black and white color bar whose length is equal to the width of the ruler.

The present invention is based on a water level measuring device/system based on a bar-shaped water level scale. The laser scanning module is composed of five parts: a laser light source, an optical scanning system, an optical receiving system, a photoelectric converter and a code counter; the laser light source is connected with the optical scanning system. , The optical receiving system is connected with the photoelectric converter, and the photoelectric converter is connected with the encoder. The scanning lens of the optical scanning system can be adjusted in angle.

For the water level measurement device/system based on the bar water level scale, the power supply module is a lithium battery power supply module or a solar battery power supply module; the wireless transmission module can be a GPRS communication module, or a satellite communication module, or a ZigBee communication module, or WIFI Communication module, or 2.4G communication module or Bluetooth communication module.

The present invention is based on a water level measuring method and device/system based on a bar-shaped water level scale, and the principle of measuring the water level (the following data processing program is executed by a microprocessor): According to the scanning result of the laser scanning device, it is recognized that the water level scale is not submerged by the water body The length of the part, based on the different reflectivity of the strips of different colors of the water level scale, identify the number of stripes in the water level scale that is not submerged by the water body, and then calculate the length of the strip water level according to the width of the scale strips. The length of the submerged part of the water body, and finally the water level of the measured water body is calculated according to the difference between the length of the entire water level scale and the length of the unsubmerged part, as well as the zero point elevation of the water level scale or/and the installation inclination of the water level scale.

Specifically, the main control circuit 3 sends a signal to the laser scanning module 2. After receiving the signal, the laser scanning module 2 sends a laser to scan the part of the water level scale that is not submerged by the water body. The strength of the reflected light signal reflected by the scale is also different, and then the reflected light signal with different strengths is converted into 0, 1 digital electrical signals, and can be determined by measuring the number of pulsed digital electrical signals 0, 1. The number of white scribed bars and black scribed bars or red scribed bars or blue scribed bars, and then calculates the length of the unsubmerged part of the bar water level scale according to the width of the scale scribed bars, and then according to the entire water level From the difference between the length of the ruler and the length of the unsubmerged part, and the zero point elevation of the water level ruler, the water level of the measured water body can be calculated.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Those skilled in the art can make any changes to the above embodiments without creative work in combination with the prior art. Simple modifications, equivalent changes, or substitutions using conventional technical means in the field, as long as they do not depart from the technical essential features of the present invention, should all be included within the protection scope of the claims of the present invention.

Claims (10)

1. A water level measuring method based on a strip-shaped water level scale comprises the following steps:

step s1, process of equipment installation:

(1) installing or drawing a strip-shaped water level scale on occasions such as channels and riverways needing water level measurement;

(2) installing a laser scanning device at a proper position facing the bar-shaped water level scale;

step s2, information acquisition process:

scanning the part of the strip-shaped water level scale which is not submerged by the water body by using a laser scanning device;

step s3, data processing flow:

and the data processing device identifies and calculates the length of the part, which is not immersed by the water body, of the water level scale according to the scanning result of the laser scanning device, and then calculates the water level of the measured water body according to the length difference between the whole length of the water level scale and the part, which is not immersed, and the zero elevation of the water level scale.

2. The water level measuring method based on the bar type water level scale according to claim 1, wherein: the scale of the bar-shaped water level scale is carved by adopting 1 mm resolution; the scale with the resolution of 1 mm is drawn by a color bar with the width of 1 mm, wherein the length of the red and white phase or the blue and white phase or the black and white phase is equal to the width of the scale.

3. The water level measuring method based on the bar type water level scale according to claim 1, wherein: the scale of the strip-shaped water level scale is depicted by adopting 1 cm resolution; the scale with the resolution of 1 cm is drawn by a color bar with the width of 1 cm and the length of red and white phases or blue and white phases or black and white phases being equal to the width of the scale.

4. The method of measuring water level based on the bar type water level gauge according to claim 1, 2 or 3, wherein: the data processing device identifies the number of the scale engraving strips of the non-water-submerged part of the bar-shaped water level scale through laser scanning according to the different reflectivity of the scale engraving strips of different colors of the bar-shaped water level scale, and calculates the length of the non-water-submerged part of the bar-shaped water level scale according to the width of the scale engraving strips of the bar-shaped water level scale.

5. The method of claim 4, wherein the water level measuring bar comprises: according to the difference of the intensity of reflected light signals reflected by the scale engraving strips with different colors of the bar-shaped water level scale, the reflected light signals with different intensities are converted into 0 and 1 digital electric signals by the laser scanning device, the number of white engraving strips and black engraving strips or red engraving strips or blue engraving strips can be judged by measuring the number of the pulse digital electric signals 0 and 1, and then the length of the part, which is not submerged by the water body, of the bar-shaped water level scale is calculated according to the width of the scale engraving strips.

6. The utility model provides a water level measuring device based on bar water level gauge, includes bar water level gauge and bar water level gauge scanning host computer, its characterized in that: the bar-shaped water level scale scanning host computer, include: the device comprises a laser scanning module (2), a main control circuit (3), a wireless transmission module (4) and a power supply module (5), wherein an output signal of the laser scanning module (2) is connected to the main control circuit (3); the wireless transmission module (4) is in communication connection with the main control circuit (3); the power supply module (5) provides a working power supply for the laser scanning module (2), the main control circuit (3) and the wireless transmission module (4).

7. The water level measuring apparatus according to claim 6, wherein: the strip-shaped water level scale is installed or drawn in places such as channels, riverways, reservoirs and the like needing to measure the water level; the scale of the bar-shaped water level scale is drawn by adopting red and white or blue and white or black and white color bars with the length equal to the width of the scale, and the width of the red and white or blue and white color bars is 1 mm or 1 cm.

8. The water level measuring apparatus according to claim 6 or 7, wherein: the main control circuit (3) comprises a microprocessor (6), a memory (7) and a peripheral control circuit (8), the microprocessor is connected with the peripheral control circuit and the wireless transmission module, and the peripheral control circuit is connected with the laser scanning module; the microprocessor executes the following data processing program: according to the scanning result of the laser scanning device, the length of the part, which is not immersed by the water body, of the water level scale is identified and calculated, and then the water level of the measured water body is calculated according to the length difference between the whole length of the water level scale and the part, which is not immersed, and the zero elevation of the water level scale.

9. The water level measuring apparatus according to claim 6 or 7, wherein: the laser scanning module consists of a laser light source, an optical scanning system, an optical receiving system, a photoelectric converter and a code counter; the laser light source is connected with the optical scanning system, the optical receiving system is connected with the photoelectric converter, and the photoelectric converter is connected with the code counter.

10. The water level measuring apparatus according to claim 6 or 7, wherein: bar water level scale scanning host computer include rain-proof water tank body (1), laser scanning module (2), master control circuit (3), wireless transmission module (4) and power module (5) arrange in rain-proof water tank body (1), laser scanning module sets up in rain-proof water tank body front end.

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