KR100439548B1 - Portable ultrasonic liquid level measuring instrument - Google Patents

Abstract

The present invention relates to a portable ultrasonic liquid interface measuring device.

The portable ultrasonic liquid interface measuring apparatus of the present invention includes an LCD (11) window 11 which displays the depth and temperature of the medium and a piezoelectric speaker 12 and a plurality of setting buttons 13 which output sound according to the medium. It includes, to control the transmission and reception of the ultrasonic signal therein to calculate the sound velocity of the ultrasonic wave and display the depth and temperature data of the medium in the LCD window 11, the sound according to the medium through the piezoelectric speaker 12 A monitor (10) having a control unit (40) for processing various types of data to be outputted to the apparatus; A tape measure 20 extending vertically to a lower portion of the monitor 10 and having a flexible cable 21 adhered to a rear surface thereof; It is installed at the lower end of the tape measure 20, the temperature sensor 31 for sensing the temperature of the medium therein, the ultrasonic transmission sensor 33 for transmitting the ultrasonic wave through the medium, and receives the ultrasonic wave and delivers it to the microprocessor There is a technical feature in the structure consisting of the sensor unit 30 is provided with an ultrasonic receiving sensor (32).

Therefore, the portable ultrasonic liquid interface measuring apparatus of the present invention can determine the type of the medium by measuring the traveling speed of the ultrasonic wave in the medium, and output the sound according to the sound velocity data value to measure the interface depth of the medium, By displaying the temperature and sound velocity data detected by the temperature sensor and the depth of the medium on the LCD window, it is effective to accurately measure the type, depth and temperature of the medium. By displaying the temperature and depth on the window, it is convenient to check the measurement dimensions and operation status, and it has the advantage that accurate measurement is realized by realizing high precision by compensating the temperature when the temperature changes.

Description

Portable ultrasonic liquid level measuring instrument

The present invention relates to a portable ultrasonic liquid interfacial measuring apparatus, and more particularly, by measuring the sound velocity and temperature of the medium by using the property that the sound wave transmission speed is different depending on the medium to determine the type of the medium and The present invention relates to a portable ultrasonic interface measuring apparatus which can output different sounds and display the temperature and depth of the medium.

In general, in order to measure the flow rate stored in a storage tank buried underground such as a gas station, a person directly measures the flow rate by using a simple measuring device such as a rope, ruler, or rod.

In the case of measuring the flow rate using the simple physical measuring device as described above, it can be said to be efficient when the size of the storage tank is relatively small. However, the crude oil or crude oil imported from foreign countries to the refinery and the like is processed and stored first. In the case of storage tanks with large areas such as refineries or oil tankers installed in order to make large quantities, it is inconvenient for surveying and difficult to measure accurate flow rates due to errors, and there is a risk of explosion due to chemical reactions. There was this.

In addition, in the case of the tank for storing a large amount of liquid, such as oil, there is a huge economic loss even if a small error occurs, it is necessary to measure the exact flow rate in terms of inventory management.

Therefore, in order to solve the problems such as the hassle and error that a person must use the measuring device as described above, the measuring device in the place and storage facilities, etc. where the accurate distance measurement is not conventionally performed with a physical measuring tool. An automatic measuring device has been developed that can measure the exact distance by using.

As the automatic measuring device as described above, a measuring device using a capacitance method, an encoder method, an ultrasonic method, a radar method, or the like is used.

However, the method using the radar has a problem that the measurement accuracy is high due to the small error, but the production cost is high, so it is difficult to commercialize. The method using the capacitance reduces the production cost while the measurement of the error occurs due to the large error. There is a problem that the precision is low, which is not commercially available.

On the other hand, investigating the internal state of an object from the outside using sound that can be audible to the human eye has been done from time to time. Since the acoustic test depends on the human tract, the precision is not so high. Ultrasonic is applied to various fields such as ultrasonic cleaning, ultrasonic processing, ultrasonic welding, and medical fields using high ultrasonic waves. As the technical research of ultrasonic waves continues, it is used throughout the chemical, mechanical, and metal industries.

Ultrasound is a sound of high frequency of about 14KHz or more that is generally inaudible to the human ear. The frequency used in the ultrasonic level meter is from 9KHz to 50KHz, and the frequency in this range is easy to generate powerful ultrasonic pulses and to obtain directivity. As it generates short pulse, it is possible to measure the speed of sound accurately.

On the other hand, the generation or detection of sound waves is divided into one of electromagnetic induction, magnetostriction, and piezoelectric, which converts electrical energy and elastic energy, converts electrical signals into ultrasonic waves, emits ultrasonic waves, and By detecting the reflected wave from the device, the presence or absence of an object and the distance to the object can be measured.

Ultrasonic flowmeters are currently being developed in the US, Germany, Japan, and other developed countries, and have been successfully developed in commercialized models, securing a global market. Ultrasonic sensors are being actively researched in Korea. However, research on the development of the ultrasonic sensor applied to the instrumentation control part is insufficient, and the current situation is dependent on the total amount of income.

Accordingly, the present invention has been made to solve the above problems and disadvantages of the prior art, by preventing the explosion due to the chemical reaction by using ultrasonic waves and by measuring the speed of sound in the medium using the pronunciation and sound absorption of the ultrasonic waves Explosion-proof ultrasonic liquid interface as a unique model in Korea that enables to know the type of medium and to measure the depth of a specific medium by varying the sound output according to the medium and to display the measured depth and temperature on the LCD screen. The purpose is to provide a measuring device.

1 is a schematic front view of the present invention portable ultrasonic liquid interfacial measurement device.

Figure 2 is a block diagram of the present invention portable ultrasonic liquid interface measurement device.

Figure 3 is a flow chart showing a data processing process of the present invention portable ultrasonic liquid interface measurement apparatus.

Figure 4 is a flow chart showing a medium depth measurement process by the present invention portable ultrasonic liquid interface measurement apparatus.

((Explanation of symbols for main parts of drawing))

10. Monitor 11. LCD window

12. Piezoelectric Speaker 13. Settings Button

20. Tape measure 21. Flexible cable

30. Sensor unit 31. Temperature sensor

32. Ultrasonic Transmitter 33. Ultrasonic Transmitter

The object of the present invention is to determine the type of the medium by calculating the sound velocity of the medium by measuring the time the ultrasonic wave is transmitted from the ultrasonic transmitting sensor using the ultrasonic wave and the transmitted signal is received by the ultrasonic receiving sensor, It is achieved by a portable ultrasonic interface measuring device for outputting the sound according to the depth measurement of the medium using a tape measure or converting the depth to be displayed on the LCD screen.

The portable ultrasonic interface measuring apparatus of the present invention includes an LCD window for displaying the depth and temperature of the medium and a piezoelectric speaker for outputting sound according to the medium, and a plurality of setting buttons. A monitor having a control unit for controlling a received signal to calculate a sound velocity of ultrasonic waves, displaying a depth and temperature data of a medium on the LCD window, and processing various data to output sound according to the medium to the outside through a piezoelectric speaker; A tape measure extending perpendicularly to the lower portion of the monitor and having a flexible cable adhered to the rear surface thereof; The sensor unit is installed at the lower end of the tape measure and has a temperature sensor for sensing the temperature of the medium therein, an ultrasonic transmitting sensor for transmitting ultrasonic waves through the medium, and an ultrasonic receiving sensor for receiving and transmitting the ultrasonic waves to the microprocessor. It is composed.

The sensor unit may calculate the sound velocity through the medium by counting the time when the ultrasonic signal is received from the ultrasonic transmitting sensor through the medium to the ultrasonic receiving sensor and transmitting the same to the controller.

At this time, the temperature sensor constituting the sensor unit detects the temperature of the medium and converts it into a digital signal, and transmits the data to the control unit to prevent measurement errors due to temperature differences and to compensate for the temperature to increase the accuracy, received through the medium The signal to be passed passes through a tuning circuit to remove noise and only a signal of sufficient strength passes through an amplifying circuit to operate the counter.

As the data is transmitted from the sensor unit to the controller as described above, the sound output controller removes the high frequency portion of the ultrasonic signal and outputs only the audible frequency portion to the piezoelectric speaker so that different sounds are output according to the medium.

Therefore, when the sensor unit passes through the interface of the medium, the output sound changes according to the change in the speed of sound, so the user can read the scale of the tape measure at that time and measure the depth of the medium. By transmitting to the display unit, the depth data of the medium can be output to the LCD window.

Details of the above object and technical configuration of the present invention and the effects thereof according to the present invention will be described with reference to the accompanying drawings.

First, Figure 1 is a schematic configuration diagram of a portable ultrasonic interface measuring apparatus of the present invention.

As shown, the portable ultrasonic interface measuring apparatus of the present invention includes an LCD (11) window 11 and a plurality of setting buttons 13 on the outside and a monitor 10 having a built-in control unit, and the monitor ( 10 is a tape measure (20) formed perpendicularly to the lower portion of the lower, and installed on the lower end of the tape measure (20) is provided with a temperature sensor 31, and the ultrasonic transmitting and receiving sensors 33, 32 therein It consists of a sensor unit 30.

The monitor 10 controls the transmission and reception of ultrasonic signals, arithmetic processing of various signals, program memory, built-in memory, arithmetic and unit conversion of various data, display of numbers and characters, sound output, input keypad, selection of input power, and the like. It is a device that includes the same function.

The LCD window 11 displays the depth and temperature of the medium, and is designed to facilitate setting of the mode and the like by the plurality of setting buttons 13.

The sensor unit 30 includes a temperature sensor 31 and ultrasonic transceiving sensors 33 and 32 so that when the sensor unit 30 is locked in a medium, ultrasonic signals are generated by the control of the monitor 10. Operate the counter until the signal transmitted from the transmitting sensor 33 is received by the ultrasonic receiving sensor 32 to convert sound with the distance between the ultrasonic transmitting sensor 33 and the receiving sensor 32 to generate sound velocity data of the medium. do.

At this time, since the sound speed of the ultrasonic wave increases as the temperature increases, it is necessary to correct the sound speed by measuring the temperature.

Therefore, the temperature sensor 31 detects the temperature of the medium and displays it on the LCD window 11 of the monitor, and automatically corrects an error value of the sound speed due to temperature change so that the accurate sound speed is measured. Analyze

At this time, when the sound velocity of the medium is measured as described above, the signal is pulse-width modulated and the high frequency part is removed, so that only the audible frequency part is output to the piezoelectric speaker.

An audible frequency refers to the frequency of sound waves a human can hear and generally refers to a frequency range of 20 to 2000 hertz.

Therefore, when the vertical position of the sensor unit 30 which is locked inside the tank or the like in which different media are mixed is changed to pass through the interface of the medium, the sound velocity of the medium is changed, and the sound output to the speaker is changed accordingly. do.

At this time, the user reads the scale of the tape measure 20 directly or the depth data of the medium is displayed on the LCD window 11 by an encoder connected to the tape measure so that the interface level of the liquid and other fluids is measured. .

Next, FIG. 2 is a block diagram of a portable ultrasonic liquid interface measuring apparatus of the present invention, FIG. 3 is a flowchart showing a data processing process of the apparatus of the present invention, and FIG. 4 is a flowchart showing a medium depth measuring process of the apparatus of the present invention.

As shown in FIG. 2, the portable ultrasonic liquid interface measuring apparatus of the present invention receives a signal from a sensor unit 30 including a temperature sensor 31, an ultrasonic receiving sensor 32, and an ultrasonic transmitting sensor 33. The controller 40 is configured to receive and process the ultrasonic signal and control the counter to calculate the ultrasonic sound velocity and output data to the outside.

In the apparatus of the present invention, as shown in Figure 3, so that the sensor unit 30 is located in a specific medium to generate an ultrasonic wave to transmit and receive the ultrasonic wave with the operation of the counter, the ultrasonic signal processor 42 In order to remove noise of the signal received through the medium, the received signal passes through a tuning circuit of a predetermined frequency that matches the frequency band of the transmission signal, and amplifies the tuned signal in two stages so that only the signal having sufficient strength is countered. To operate.

Next, when the transmission and reception of the ultrasonic wave is made as described above, the counter controller 40 controls the operation and stop of the counter to transmit the counter value to the sound velocity data calculator 44. The sound velocity data calculating section 44 calculates the distance between the ultrasonic transmitting sensor 33 and the receiving sensor 32 and the time from when the ultrasonic wave is transmitted to when the ultrasonic wave is received, that is, a counter value, to calculate the sound velocity in the medium. To calculate.

At this time, the temperature compensator 45 transmits predetermined data to the sound velocity data calculator 44 to compensate the temperature by comparing the temperature value received from the temperature sensor 31 of the sensor unit 30 with the temperature reference value. It is configured to reduce the measurement error according to the temperature value.

On the other hand, when the sound velocity data is calculated as described above, the LCD output controller 46 displays the calculated sound velocity data value and temperature value in the LCD window 11 of the monitor 10, and the speaker output controller 47 displays the sound velocity data. The sound according to the value is output through the piezoelectric speaker 12.

A process of outputting sound through the piezoelectric speaker 12 will be described with reference to FIG. 4.

First, when the ultrasonic receiving sensor 32 and the ultrasonic transmitting sensor 33 transmit and receive a signal (step A101), the sound speed data calculator 44 receives the ultrasonic signal and the counter value to calculate sound speed data (step A102). )do.

When the sound speed data value is calculated as described above, the speaker output control unit 47 converts the sound speed data into an analog voice signal (step A103) in order to output sound according to the sound speed data value.

Next, the speaker output control unit 47 removes the high frequency portion of the converted signal (step A104) and amplifies only the audible frequency portion, that is, the frequency range in which the human ear can hear (A105), to the piezoelectric speaker 12. Output A106.

At this time, when the position of the sensor unit 30 is changed to the vertical lower portion through the medium to pass through the interface between the different media, the speed of sound in the medium is changed, through the piezoelectric speaker 12 The output sound is changed (step A107).

Accordingly, as the output sound changes, the LCD output control unit 46 outputs the depth data of the medium to the LCD window 11 through the encoder so that the user can visually check the depth of the specific medium. The depth of the medium may be measured by the user fixing the sensor unit 30 in a predetermined manner and reading the scale recorded on the tape measure 20 at that time and reading the depth of the specific medium.

Meanwhile, when the type, depth, and temperature of the medium are output to the LCD window 11 and the piezoelectric speaker 12 according to the sound velocity data value, the sensor unit 30 normally receives the ACK signal from the control unit 40. By resetting the counter to repeat the above process.

Therefore, the portable ultrasonic liquid interfacial measuring device of the present invention driven as described above can determine the type of the medium by measuring the individual sound velocity of the fluid components in the mixture, and measure the depth of the medium by varying the sound output according to the medium. Will be.

Therefore, the portable ultrasonic liquid interface measuring apparatus of the present invention can determine the type of the medium by measuring the traveling speed of the ultrasonic wave in the medium, and output the sound according to the sound velocity data value to measure the interface depth of the medium, By displaying the temperature and sound velocity data detected by the temperature sensor and the depth of the medium on the LCD window, it is effective to accurately measure the type, depth and temperature of the medium. By displaying the temperature and depth on the window, it is convenient to check the measurement dimensions and operation status, and it has the advantage that accurate measurement is realized by realizing high precision by compensating the temperature when the temperature changes.

Claims (2)

In the ultrasonic measuring device comprising an ultrasonic transmission and reception sensor, a temperature sensor and a display for measuring the depth of the stored liquid, A plurality of kinds of liquid media having different specific gravity are put in a tank stored in a stack and are moved in a vertical direction, and a temperature sensor 31 for sensing the temperature of the medium and an ultrasonic transceiving sensor 33 for transmitting and receiving ultrasonic waves through each medium. Sensor unit 30 having a lower end; One end is vertically connected to the upper end of the sensor unit 30, the flexible cable 21 for transmitting a signal generated from the ultrasonic sensor 32 and the temperature sensor 31 is attached to the back Itself 20; The other end of the tape measure 20 is connected and the tape measure 20 is wound and unwound, and is obtained through the control unit 40 and each medium which receives and processes a signal transmitted through the flexible cable 21. After the sound velocity data value is converted into an analog voice signal, a high frequency portion is removed, and a piezoelectric speaker 12 which outputs sound according to the amplified audible frequency portion is built-in, and the depth and temperature of each medium calculated by the controller 40 are included. Portable ultrasonic liquid interface measurement device, characterized in that the LCD window 11 and the setting button 13 is displayed including the monitor 10 is provided on the outer surface. The power supply unit of claim 1, wherein the control unit 40 includes: a power supply unit 41; An ultrasonic signal processor 42 for processing ultrasonic signals transmitted and received by the ultrasonic transceiver sensors 33 and 32; A counter control unit 40 for controlling the operation of the transmission and reception counter of the ultrasonic wave; A sound speed data calculator 44 for calculating a distance value and a counter value between the ultrasonic transceiving sensors 33 and 32 and compensating for the detected temperature to calculate sound speed data; A speaker output controller (47) for outputting sound in accordance with the sound speed data value calculated by the sound speed data calculator (44); An LCD output control unit for displaying the sound speed data value calculated by the sound speed data calculator 44, the temperature value measured by the temperature sensor 31, and the depth of the medium measured according to the change of the sound speed data value on the LCD window 11. A portable ultrasonic liquid interfacial measuring device comprising: 46).