Non-contact-type fluid depth measurement apparatus and method using multiple sensors

Abstract

The present invention relates to a non-contact-type fluid depth measurement apparatus using multiple sensors. The fluid depth measurement apparatus comprises: a first distance sensor that measures a distance by using an ultrasonic transducer for transmitting and receiving ultrasonic signals; a second distance sensor that measures a distance by using laser pulses; and a control unit that generates a correction equation for correcting measurements of the first distance sensor, measures a first distance (D1), which is the depth of a first medium, by using the first distance sensor and then corrects the first distance by using the correction equation, measures, by using a second distance sensor, a total delay time (tL) required for laser pulses to be reflected and returned after passing through the first medium and a second medium, and measures a second distance (D2), which is the depth of the second medium, by using the first distance and the total delay time (tL). The fluid depth measurement apparatus according to the present invention can measure the flow rate of fluid in a storage tank by using multiple sensors or can accurately measure the depth of a river under a bridge by using a non-contact method.

Description

Non-contact heart rate measurement device using multiple sensors and method therefor

[0001] The present invention relates to a non-contact fluid depth measuring device and a measuring method, and more particularly, to a non-contact fluid depth measuring device and a method thereof configured to accurately measure the depth of a flow rate or a river inside a storage tank using an ultrasonic sensor, a laser sensor, or the like.

[0002] Various devices and methods have been proposed for measuring the depth or water level of storage tanks or basins containing liquids such as water or oil, using ultrasonic signals or laser pulses.

[0003] Korean Patent No. 10-0780819 relates to an “ultrasonic level measuring device,” and discloses a technology for an ultrasonic level measuring device that measures the water level in a storage tank using ultrasonic waves. The ultrasonic level measuring device of the aforementioned patent is characterized in that a transmission member is installed on the inner wall of the storage tank so that ultrasonic waves transmitted from an ultrasonic vibrator are transmitted, and the ultrasonic waves are transmitted through the transmission member, reflected from the upper surface of the transmission member, and then received by the ultrasonic vibrator again through the transmission member, thereby measuring the propagation speed of the ultrasonic waves in the fluid. The ultrasonic level measuring device of the aforementioned patent requires that the transmission member be installed in the storage tank. However, there is a problem in that it is not easy to install the transmission member inside the storage tank.

[0004] Korean Patent Publication No. 10-2001-0097238 relates to “A device for measuring the water level and managing inventory in a storage tank using ultrasonic waves.” The technology disclosed herein relates to a system configured to detect the water level online in a container with a predetermined volume, such as a storage tank of various capacities, automatically calculate the capacity of the stored material in the tank, and build a database with this data for inventory management. However, the water level measuring device of the aforementioned patent requires that the volume of the storage tank be known in advance, and cannot be used if the volume of the storage tank is not known.

[0005] Korean Utility Model Publication No. 20-0343094 relates to a “device for measuring the length of an oil tank.” The device discloses a device that inserts a measuring rod into the interior of an oil tank, irradiates a laser, and uses the arrival time of the reflected laser to determine the actual length of the tank, thereby enabling precise determination of the flow rate. However, the measuring device of the aforementioned registered utility model does not consider the velocity difference between two or more different media present in the tank, resulting in errors in the measured values. Therefore, the aforementioned measuring device has a problem in that it cannot be used in tanks containing two or more media.

[0006] Meanwhile, laser beam-based depth measurement devices are also used. These devices measure river water levels by connecting the measurement path to the riverbed via pipes and adding heating wires to prevent freezing in winter. Therefore, these devices are complex to use and extremely expensive.

[0007] In order to solve the above-mentioned problem, the present invention aims to provide a fluid depth measuring device and a measuring method configured to accurately measure the flow rate of a storage tank storing fluid or the depth of a river under a bridge in a non-contact manner using multiple sensors.

[0008] The present invention, in order to achieve the above-described technical task, relates to a non-contact depth measurement device for measuring the depth of a space composed of a first medium and a second medium, comprising: a first distance sensor for measuring a distance using an ultrasonic transducer for transmitting and receiving an ultrasonic signal; a second distance sensor for measuring a distance using a laser pulse; and a first distance (D1), which is a depth of the first medium, is measured using the first distance sensor, and a total delay time (t) taken for the laser pulse to pass through the first and second media and then be reflected and return using the second distance sensor. L ) and measure the first distance and total delay time (t L ) is characterized by having a control unit for measuring a second distance (D2), which is the depth of a second medium.

[0009] In a non-contact depth measurement device using a multi-sensor according to the above-described characteristics, the control unit comprises: a first distance measurement module that measures a first distance (D1), which is a depth of a first medium, using a first distance sensor; and a second distance sensor that measures the total delay time (t) for a laser pulse to pass through the first and second media and then be reflected and returned. L ) is measured; and a second distance measuring module is provided that measures a second distance (D2), which is a depth of the second medium, using the first distance, the total delay time, and the speed and refractive index of the laser pulse in the second medium; It is preferable to measure the first distance, the total delay time, and the second distance.

[0010] In the non-contact distance measurement device using a multi-sensor according to the above-described characteristics, the control unit further comprises a correction module for deriving a correction mathematical formula for correcting the distance measured by the first distance measurement module;

[0011] The above correction module simultaneously measures the depth of the first medium using a first distance sensor and a second distance sensor for a space composed of only the first medium, and generates a correction mathematical formula for correcting the distance measured using the first distance sensor using the distances measured using the first and second distance sensors.

[0012] It is more preferable that the first distance measurement module corrects the first distance (D1) measured using the first distance sensor using the generated correction mathematical formula.

[0013] A non-contact depth measurement device using multiple sensors according to the above-described characteristics is configured to be capable of measuring while moving while being mounted on a movable guide rail, and is characterized in that it can sequentially measure depth or flow rate for a plurality of consecutive positions, and is preferably configured to be capable of correcting the measurement values ​​of the first and second distance sensors at a predetermined position of the guide rail.

[0014] A non-contact temperature measurement device using multiple sensors according to the above-described characteristics further comprises a first environment sensor for measuring the temperature of a first medium; and a second environment sensor for measuring the temperature of a second medium; and it is preferable that the control unit corrects the values ​​measured by the first and second distance sensors using the temperatures of the first and second media measured by the first and second environment sensors.

[0015] The present invention relates to a depth measurement method in a depth measurement device for measuring a depth of a space composed of a first medium and a second medium, comprising: a first distance sensor for measuring a distance using an ultrasonic transducer for transmitting and receiving an ultrasonic signal; a second distance sensor for measuring a distance using a laser pulse; and a control unit, the method comprising: (a) measuring a first distance (D1) which is a depth of the first medium using the first distance sensor; and (b) measuring a total delay time (t) taken for a laser pulse to pass through the first and second media and then be reflected and returned using the second distance sensor. L ) measuring the first distance and the total delay time (t L ) is characterized by comprising a step of measuring a second distance (D2), which is the depth of a second medium.

[0016] A non-contact depth measurement method using a multi-sensor according to the above-described characteristics further comprises: (d1) a step of simultaneously measuring distances corresponding to the depth of a first medium using a first distance sensor and a second distance sensor for a space formed only of a first medium; (d2) a step of generating a correction mathematical formula for correcting a distance measured using the first distance sensor using the distances measured using the first and second distance sensors; and it is preferable that the step (a) further comprises a step of correcting a first distance (D1) measured using the first distance sensor using the correction mathematical formula.

[0017] A non-contact depth measurement method using a multi-sensor according to the above-described characteristics is preferably configured such that the depth measurement device is mounted on a movable guide rail, and then moves along the guide rail to sequentially measure depth or flow rate at a plurality of consecutive locations, and the measurement values ​​of the first and second distance sensors can be corrected at a predetermined location on the guide rail.

[0018] The non-contact SIM measurement method using multiple sensors according to the above-described characteristics preferably further comprises a step of measuring the temperatures of the first and second media using a first environmental sensor measuring the temperature of the first medium and a second environmental sensor measuring the temperature of the second medium, and correcting the measured values ​​measured by the first and second distance sensors using the temperatures of the first and second media measured by the first and second environmental sensors.

[0019] The non-contact depth measurement device and method according to the present invention having the above-described configuration can accurately measure the depth of a fluid using a first distance sensor using an ultrasonic signal and a second distance sensor using a laser pulse.

[0020] In particular, the non-contact distance measurement device and method according to the present invention can improve the reliability of measurement data by correcting the measurement value of the first distance sensor using an ultrasonic signal.

[0021] In addition, the non-contact depth measurement device and method according to the present invention further include environmental sensors that measure the temperature of each medium, thereby measuring and correcting the depth by taking into account the speed of the ultrasonic signal and the speed of the laser pulse that change depending on the temperature of the medium, thereby further improving the reliability of the measurement data.

[0022] In addition, a non-contact water level measuring device according to the present invention can be mounted on a guide rail installed under a bridge pier, and the water level can be measured at multiple points in a river under the bridge pier while the water level measuring device is moved along the guide rail.

[0023] FIG. 1 is a block diagram illustrating the structure of a non-contact type heart rate measurement device using multiple sensors according to a preferred embodiment of the present invention.

[0024] FIG. 2 is a schematic diagram illustrating a state in which some fluid is stored in a storage tank to explain the operation of a non-contact fluid measurement device using multiple sensors according to the present invention.

[0025] FIG. 3 is a flowchart sequentially illustrating a method of measuring the heart rate by a control unit (30) in a heart rate measuring device according to a preferred embodiment of the present invention.

[0026] FIG. 4 is a graph showing ultrasonic signals of an ultrasonic transducer of a first distance sensor (10) in a distance measuring device according to a preferred embodiment of the present invention.

[0027] FIG. 5 is a graph showing laser beam pulses of a second distance sensor (20) in a distance measuring device according to a preferred embodiment of the present invention.

[0028] Figure 6 is a schematic diagram illustrating Snell's Law, which states that light passing between two media with different refractive indices is refracted at the boundary according to the angle of incidence.

[0029] FIG. 7 is a schematic diagram illustrating the measurement accuracy of the first distance sensor and the second distance sensor in a distance measurement device according to a preferred embodiment of the present invention.

[0030] FIG. 8 is a graph for deriving a mathematical formula for correction of a correction module of a control unit in a heart rate measurement device according to a preferred embodiment of the present invention.

[0031] FIG. 9 is a schematic diagram illustrating one embodiment of a heart rate measuring device according to a preferred embodiment of the present invention.

[0032] Hereinafter, a non-contact heart rate measurement device and a measurement method thereof using multiple sensors according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0033] Fig. 1 is a block diagram illustrating the structure of a non-contact depth measurement device using multiple sensors according to a preferred embodiment of the present invention. Referring to Fig. 1, a non-contact depth measurement device (1) according to the present invention is a device for measuring the depth of a space composed of at least one medium, and includes a first distance sensor (10), a second distance sensor (20), and a control unit (30).

[0034] FIG. 2 is a schematic diagram illustrating a state in which a fluid is partially stored in a storage tank, in order to explain the operation of a non-contact type fluid measurement device using a multi-sensor according to the present invention. Referring to FIG. 2, since a predetermined fluid, a second medium, is partially stored in the storage tank, the upper region of the storage tank is filled with air, a first medium, to a depth of a first distance (D1), and the lower region is filled with a predetermined fluid, a second medium, to a depth of a second distance (D2). The entire depth of the storage tank is formed by a third distance (D3), and the third distance (D3) is formed by the sum of the first distance (D1) and the second distance (D2).

[0035] The first distance sensor (10) is a sensor that measures distance using an ultrasonic transducer that transmits and receives ultrasonic signals. The second distance sensor (20) is a sensor that measures distance using a laser pulse. The control unit (30) measures a first distance (D1) from a measurement point where the ultrasonic transducer is located to the lower surface of the first medium using the first distance sensor, and measures the total delay time (t) from the measurement point where the laser transmitter is located to the lower surface of the second medium after passing through both the first and second media. L ) and measure the first distance (D1) and the total delay time (t L ) is used to measure the second distance (D2), which is the depth of the second medium.

[0036] Hereinafter, the structure and operation of the control unit will be described in more detail.

[0037] FIG. 3 is a flowchart sequentially illustrating a method for measuring the depth of field performed by a control unit (30) in a device for measuring depth of field according to a preferred embodiment of the present invention. Referring to FIG. 3, the method for measuring depth of field according to the control unit having the above-described configuration generates a correction mathematical formula for correcting the measurement value of the first distance sensor using a correction module before / after measurement (step 300). Next, a first distance, which is a depth of a first medium, is measured using the first distance sensor (step 310), and the measured first distance is corrected using the correction mathematical formula (step 320). Next, a second distance sensor using a laser pulse is used to measure the total delay time (t) taken for the light to pass through a third distance (D3), which is the total depth of the first and second medium, and then be reflected and returned from the lower surface of the second medium. L ) is measured (step 330). Next, the first distance (D1) and the total delay time (t L ) and the velocity of the laser beam in the second medium (V M2 ) and refractive index (n M2 ), the second distance (D2), which is the depth of the second medium, is measured (step 340). Meanwhile, in the above-described steps 310 and 340, it is preferable to measure the temperatures of the first medium and the second medium, correct the speed of the ultrasonic signal in the first medium and the speed of the laser pulse in the second medium using the measured temperatures, and calculate the first distance and the second distance using the corrected speed.

[0038] In order to perform the aforementioned distance measurement method, the control unit (30) is equipped with a first distance measurement module (300), a delay time measurement module (310), and a second distance measurement module (320), and can measure depths (D1, D2) of the first medium and the second medium, respectively. The control unit may further include one or more of a correction module (330), a first environment sensor (40), and a second environment sensor (42) to improve the reliability and accuracy of the distance measurement. Hereinafter, the operations of each component module of the control unit will be described in detail.

[0039] The above first distance measuring module (300) measures a first distance (D1), which is the depth of a first medium, from a measurement point using a first distance sensor having an ultrasonic transducer.

[0040] FIG. 4 is a graph illustrating ultrasonic signals of an ultrasonic transducer of a first distance sensor (10) in a distance measurement device according to a preferred embodiment of the present invention. Referring to FIG. 4, (a) is an ultrasonic pulse signal transmitted by the ultrasonic transducer, and (b) is an ultrasonic return pulse signal reflected from the surface of a second medium.

[0041] Therefore, the first distance measuring module (300) first measures the difference (t) between the transmission time when the first distance sensor transmits the ultrasonic signal and the reception time when the ultrasonic return pulse signal reflected from the surface of the second medium is received. s ) is obtained. Since the ultrasonic return pulse signal travels back and forth from the ultrasonic transducer to the lower surface of the first medium, i.e., the surface of the second medium, the first distance (D1), which is the depth of the first medium from the ultrasonic transducer, can be obtained as in mathematical equation 1.

[0042]

[0043]

[0044] Here, Vs is the speed of the ultrasonic signal, and ts is the time it takes for the ultrasonic signal to be transmitted from the ultrasonic transducer, reflected from the lower surface of the first medium, and received again by the ultrasonic transducer. At this time, the ultrasonic signal is passing through the first medium, air, and its speed (V s ) is a function of temperature [℃] and can be obtained as in mathematical equation 2.

[0045]

[0046] The above delay time measurement module (310) uses a second distance sensor using a laser pulse to measure the total delay time (t) taken for the light to pass through the third distance (D3), which is the total depth of the first and second media from the measurement point, and then be reflected and returned from the lower surface of the second media. L ) is measured. Fig. 5 is a graph showing laser pulses of a second distance sensor (20) in a distance measuring device according to a preferred embodiment of the present invention. Referring to Fig. 5, (a) is a transmitted laser pulse signal, and (b) is a laser pulse signal reflected from the bottom surface of the second medium.

[0047] Referring to Fig. 5, the delay time measurement module briefly turns on the laser to measure the SIM, detects the reflected light, and measures the total delay time (t) which is the time difference. L ) is obtained. In general, since fluids (including water) allow light such as lasers to pass through them, the laser pulse starting from the transmitter of the second distance sensor passes through the first medium and the second medium, and then reflects from the bottom surface of the second medium and returns. Therefore, the total delay time (t) of the received laser pulse L ) is the round trip time (t) of the laser pulse in the first medium. M1 ) and the round trip time in the second medium (t M2 ) is obtained as the sum of

[0048]

[0049] The second distance measuring module (320) measures the first distance (D1) and the total delay time (t L ) and the velocity of the laser beam in the second medium (V M2 ) and refractive index (n M2 ) is used to measure the second distance (D2), which is the depth of the second medium. Hereinafter, the process of measuring the second distance (D2), which is the depth of the second medium, by the second distance measuring module (320) will be described in more detail.

[0050] First, the third distance (D3), which is the total depth of the first and second media, , and can be obtained by the mathematical formula 4 below.

[0051]

[0052] Here, V M1 and V M2 are the speeds of light in the first and second media, respectively.

[0053] Here, By applying , D2 can be expressed as mathematical formula 5.

[0054]

[0055] Here, the first distance (D1), which is the depth of the first medium, is equal to D1 measured by the first distance measurement module, and the total delay time (t L ) is the value measured by the second distance sensor.

[0056] Below, the velocity (V) of the laser beam of the second distance sensor in the first medium M1 ) and velocity in the second medium (V M2 ) describes the process of calculating the velocity in the first medium (V). Since the first medium is air, the velocity in the first medium (V M1 ) is the speed of light in air (V Air ) is the same. Therefore, the velocity in the first medium (V M1 ) is the speed of light V in free space, as shown in mathematical equation 6 below. c The refractive index of air ( ) can be obtained by dividing it by .

[0057]

[0058] Here, V c is the speed of light, 2.99792458Х10 8 [m / sec] is.

[0059] The speed of the laser pulse in the second medium changes at the interface with air.

[0060]

[0061] The speed of the laser pulse in the second medium (V) using mathematical expression 7 M2 ) is determined according to the type of the second medium, as shown in Table 1 below.

[0062] Substance nameRefractive indexSpeed ​​of light[10,000 km / esc)Vacuum129.979Air1.00029329.970Water1.33322.490Gasoline1.4021.414Kerosene1.4520.675Light oil1.5019.986Heavy oil1.4520.675Glycerin1.4720.394Benzene1.5019.986Toluene1.5019.986Xylene1.5019.986Ethanol1.3622.044

[0063]

[0064] Figure 6 is a schematic diagram illustrating Snell's Law, which states that light passing between two media with different refractive indices is refracted at the interface according to the angle of incidence. Referring to Figure 6, light passing between two media with different refractive indices is refracted according to the angle of incidence, and its wavelength and speed change. The speed in the two media ( , ) and wavelength ( , ), and the refractive index in the two media ( , ), the relationship between them is as shown in mathematical expression 8.

[0065]

[0066] Since refraction of light causes a change in the optical path, there is a possibility of errors in the measurement of the second distance (D2), which is the depth of the second medium. Therefore, it is preferable that the depth measurement device according to the present invention align the optical path with D2 by allowing the laser light to be incident perpendicular to the surface of the second medium.

[0067] Meanwhile, in measuring the second distance (D2), which is the depth of the second medium, the first distance (D1), which is the depth of the first medium measured by the first distance sensor, is used, so the accuracy of the first distance is very important. Fig. 7 is a schematic diagram illustrating the measurement accuracy of the first distance sensor and the second distance sensor in the depth measurement device according to a preferred embodiment of the present invention.

[0068] Referring to FIG. 7, the first distance sensor is an ultrasonic sensor, which uses a low-frequency signal of 20 kHz or more, has a wide angle of the emitted beam, and has disadvantages such as diffraction, but is excellent at determining the presence or absence of a reflected object. However, since the first distance sensor measures as “Distance-B” in FIG. 7, the measurement value has an error of about ± 5 cm. In contrast, since the second distance sensor uses visible light, the angle of the beam is narrow, and the accuracy of the distance measurement value measured by reflection is high. Since the second distance sensor measures as “Distance-A” in FIG. 7, the accuracy is high. Therefore, the control unit of the distance measurement device according to the present invention is configured to correct the measurement value of the first distance sensor using the measurement value of the second distance sensor before / after measurement, thereby improving the accuracy of the measurement.

[0069] Accordingly, the control unit may further include a correction module (330) that derives a correction mathematical formula for correcting the distance measured by the first distance measurement module. It is preferable that the first distance measurement module correct the first distance (D1) measured using the first distance sensor using the correction mathematical formula obtained by the correction module (330).

[0070] Hereinafter, the process of the correction module (330) obtaining a correction mathematical formula will be described. The correction module (330) simultaneously measures the depth of the first medium using the first distance sensor and the second distance sensor, respectively, for a space composed of only the first medium, and derives a correction mathematical formula in the form of a linear equation, a quadratic equation, or a cubic equation using the distances measured using the first and second distance sensors. Fig. 8 is a graph for deriving a correction mathematical formula of the correction module of the control unit in a depth measurement device according to a preferred embodiment of the present invention. Referring to Fig. 8, the first distance can be corrected using the linear equation.

[0071] For the first medium, it is assumed that the distances measured simultaneously by the first and second distance sensors are as shown in Table 2 below.

[0072] Distance measured by the second distance sensor (y) Distance measured by the first distance sensor (x) 30.327.79100.196.22

[0073]

[0074] By applying the linear equation y = ax+b to the correction equation and substituting the values ​​of x and y in the diagram above, a and b can be obtained. In this case, a = 1.021481806 and b = 1.913020605. Accordingly, the correction equation can be obtained as a linear equation applying the above-calculated a and b.

[0075] Using the aforementioned correction mathematical formula, the first distance measurement module compensates for the first distance measured by the first distance sensor and provides the corrected value, thereby improving the reliability of the measured value. The results of measuring the error for the actually compensated first distance are shown in Table 3 below.

[0076] Distance measured by the second distance sensor (y) Distance measured by the first distance sensor (x) Corrected first measurement distance error 61.15 7.96 61.10789 - 0.00789 196.719 0.68 196.68 9 20.010829

[0077]

[0078] Meanwhile, the temperature measurement device according to the present invention may further include a first environment sensor (40) for measuring the temperature of the first medium and a second environment sensor (42) for measuring the temperature of the second medium. Since the speed of light in each medium changes depending on the temperature of the corresponding medium, by correcting the depth of the first medium and the depth of the second medium in consideration of the temperature of the medium, the reliability of the measurement data can be secured, thereby improving the reliability of the measurement.

[0079] It is preferable that the control unit of the ultrasound measurement device measures the temperatures of the first and second media, respectively, using the first and second environmental sensors, determines the speed of the ultrasound signal and the speed of the laser pulse in each media using the measured temperatures of each media, and corrects the first distance measured by the first distance measurement module and the second distance measured by the second distance measurement module using these speeds. This is because the ultrasound speed and the speed of the laser beam in each media change depending on the temperature, and by correcting the depth of the first media and the depth of the second media in consideration of such changes, reliability of the measurement data can be ensured.

[0080] FIG. 9 is a schematic diagram illustrating an embodiment of a flow measurement device according to a preferred embodiment of the present invention. Referring to FIG. 9, an embodiment of a flow measurement device according to the present invention can be used to measure a riverbed and a flow rate using a guide rail. The flow measurement device according to the above-described embodiment is configured to be movably mounted on a guide rail installed under a bridge pier, and to be capable of measuring while moving on the guide rail. Accordingly, the flow measurement device can measure the riverbed as well as the flow rate by sequentially measuring the depth or flow rate for a plurality of consecutive positions of the riverbed under a bridge pier while moving along the guide rail. In particular, the flow measurement device described above is configured to correct the measurement values ​​of the first and second distance sensors using the first and second environmental sensors described above at a predetermined position of the guide rail, thereby ensuring the reliability of the measurement data.

[0081] By installing a water level measuring device according to the embodiment described above at the bottom of a bridge, the water level of major points in the river can be selectively measured while moving the water level measuring device along a guide rail, thereby enabling flood control and prevention.

[0082] In addition, by using the depth measurement device according to the embodiment described above, the depth of the river can be measured intermittently to create a depth map, and further, based on the depth maps created in this way, dredging work can be performed before the rainy season to prevent flooding.

[0083] While the present invention has been described above with reference to preferred embodiments thereof, these are merely illustrative and not limiting. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. Furthermore, any differences related to such modifications and applications should be construed as being within the scope of the present invention as defined in the appended claims.

[0084]

[0085]

Claims

1. In a non-contact depth measuring device for measuring the depth of a space composed of a first medium and a second medium, A first distance sensor that measures distance using an ultrasonic transducer that transmits and receives ultrasonic signals; a second distance sensor that measures distance using laser pulses; and Using the first distance sensor, the first distance (D1), which is the depth of the first medium, is measured, and using the second distance sensor, the total delay time (t) taken for the laser pulse to pass through the first and second media and then be reflected and return L ) and measure the first distance and total delay time (t L ) to measure the second distance (D2), which is the depth of the second medium; A non-contact heart rate measurement device using multiple sensors, characterized by having:

2. In the first paragraph, the control unit, A first distance measuring module that measures a first distance (D1), which is a depth of a first medium, using a first distance sensor; Using a second distance sensor, the total delay time (t) for the laser pulse to pass through the first and second media and then be reflected and returned L ) delay time measurement module; and A second distance measuring module that measures a second distance (D2), which is a depth of the second medium, using the first distance, the total delay time, and the speed and refractive index of the laser pulse in the second medium; A non-contact measurement device using multiple sensors, characterized in that it measures a first distance, a total delay time, and a second distance.

3. In the second paragraph, the control unit, Further comprising a correction module for generating a correction mathematical formula for correcting the distance measured by the first distance measurement module; The above correction module, For a space consisting of only the first medium, the depth of the first medium is measured simultaneously using the first distance sensor and the second distance sensor, It is characterized in that a correction mathematical formula is generated to correct the distance measured using the first distance sensor using the distances measured using the first and second distance sensors, The above first distance measuring module, A non-contact depth measurement device using multiple sensors, characterized in that the first distance (D1) measured using the first distance sensor is corrected using the generated correction mathematical formula.

4. In the first paragraph, the depth measurement device is configured to be mounted on a movable guide rail and measure while moving, so that it can sequentially measure depth or flow rate for a plurality of consecutive positions. A distance measuring device characterized in that it is configured to correct the measurement values ​​of the first and second distance sensors at a predetermined position of the guide rail.

5. In the first paragraph, the non-contact type SIM measuring device, A first environmental sensor measuring the temperature of the first medium; and A second environmental sensor for measuring the temperature of the second medium is further provided; The above control unit, A non-contact temperature measurement device using multiple sensors, characterized in that the values ​​measured by the first and second distance sensors are corrected using the temperatures of the first and second media measured by the first and second environment sensors.

6. A depth measurement method in a depth measurement device for measuring the depth of a space composed of a first medium and a second medium, comprising: a first distance sensor for measuring a distance using an ultrasonic transducer for transmitting and receiving ultrasonic signals; a second distance sensor for measuring a distance using a laser pulse; and a control unit; (a) a step of measuring a first distance (D1), which is a depth of a first medium, using the first distance sensor; (b) The total delay time (t) taken for the laser pulse to pass through the first and second media and then be reflected back using the second distance sensor L ) measuring step; and (c) the first distance and the total delay time (t L ) to measure the second distance (D2), which is the depth of the second medium; A non-contact SIM measurement method using multiple sensors, characterized by having:

7. In the 6th paragraph, the method for measuring the heart rate is as follows: (d1) A step of simultaneously measuring distances corresponding to the depth of the first medium using a first distance sensor and a second distance sensor for a space composed of only the first medium; (d2) It is characterized by comprising a step of generating a correction mathematical formula for correcting the distance measured using the first distance sensor by using the distances measured using the first and second distance sensors; Step (a) above, A non-contact depth measurement method using multiple sensors, characterized in that it further comprises a step of correcting a first distance (D1) measured using a first distance sensor using the above correction mathematical formula.

8. In the 6th paragraph, the method for measuring the heart rate is: The above-mentioned depth measuring device is mounted on a movable guide rail, and is characterized in that it sequentially measures depth or flow rate at multiple consecutive locations while moving along the guide rail. A non-contact depth measurement method using multiple sensors, characterized in that the measurement values ​​of the first and second distance sensors can be corrected at a predetermined position of the guide rail.

9. In the 6th paragraph, the non-contact SIM measurement method, The temperatures of the first and second media are measured using a first environmental sensor that measures the temperature of the first medium and a second environmental sensor that measures the temperature of the second medium, A non-contact depth measurement method using multiple sensors, characterized in that it further comprises a step of correcting the measurement values ​​measured by the first and second distance sensors using the temperatures of the first and second media measured by the first and second environment sensors.

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