CN107252315B - Correctable pressure-variable human body volume measuring device, method and system - Google Patents
Correctable pressure-variable human body volume measuring device, method and system Download PDFInfo
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- CN107252315B CN107252315B CN201710415062.2A CN201710415062A CN107252315B CN 107252315 B CN107252315 B CN 107252315B CN 201710415062 A CN201710415062 A CN 201710415062A CN 107252315 B CN107252315 B CN 107252315B
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- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1075—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer
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Abstract
The invention discloses a correctable pressure-variable human body volume measuring device, method and system, the method comprises the following steps: measuring the air pressure value in the container before the human body enters; a human body enters a measuring container, a certain amount of air is injected, and the air pressure value in the measuring container at the moment is measured; the invention can realize simple, rapid and accurate measurement of the volume of the human body by determining the pressure proportional coefficient according to the pressure change in the measuring container before the human body enters the measuring container and after the human body enters the measuring container and is injected with air, determining the gas mass proportional coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportional coefficient, the gas mass proportional coefficient and the volume of the measuring container.
Description
Technical Field
The present invention relates to a volume measuring device, method and system, and more particularly, to a pressure-variable adjustable human body volume measuring device, method and system.
Background
The medicine directly acts on human body, the correct use can achieve the purpose of medication, and the wrong use not only has no effect on treatment, but also can possibly harm the health of the user who uses the medicine. At present, the medication guidance of doctors or pharmacists is generally based on the weight of a patient, namely, the dosage of the patient is determined according to the weight, but the dosage of the patient is often inaccurate according to the weight, and if the dosage of the patient can be determined according to the volume and the density of the human body, the accuracy of medication is greatly improved, so that how to simply, quickly and accurately obtain the volume of the human body becomes important.
In the prior art, the physique of a person is measured only by the height and the weight of the person, the difference of the volume and the density of the person is not considered, and in fact, even if the body has the same height and the weight, the difference of the thickness, the width and the fructification degree of the natural body also exists, so that the accurate medication and the supplement of nutrient components in clinic are influenced.
There are two traditional methods for measuring the volume of a human body: 1. estimation, i.e. dividing the weight of a person by the density of the body, typically by setting the density of the person equal to about 1g/cm3(ii) a 2. The drainage method is to immerse the whole body of a person in a fixed container filled with water, and to measure the water level or the amount of water overflowing. However, since the estimation is performed only by approximating the density of the human beingThe human body volume is estimated to be equal to 1, and the accuracy of the obtained result is poor; the drainage method needs to immerse the whole body into water, which is inconvenient, causes water resource waste and increases the disinfection cost of public appliances.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a device, a method and a system for measuring human body volume with adjustable pressure, so as to achieve simple, fast and accurate measurement of human body volume.
In order to achieve the above and other objects, the present invention provides a correctable pressure-variable human body volume measuring device, which includes a measuring container containing air, the measuring container being provided with a gas injection device for supplying injected air and an air pressure detecting device for detecting an air pressure value in the measuring container, the air pressure detecting device calculating a volume of a human body by measuring a change in air pressure in the measuring container before and after injecting a certain amount of gas.
Further, the human body volume measuring device further comprises a weight measuring device, and the weight measuring device is used for measuring the weight of the human body so as to calculate the density of the human body according to the calculated volume of the human body.
In order to achieve the above object, the present invention further provides a correctable method for measuring a volume of a human body by pressure change, comprising the steps of:
measuring the air pressure value in a measuring container before a human body enters the measuring container;
step two, enabling a human body to enter a measuring container, injecting a certain amount of air, and measuring the air pressure value in the measuring container at the moment;
and step three, determining a pressure proportion coefficient according to the pressure change in the measuring container before the human body enters the measuring container and after the human body enters the measuring container and air is injected, determining a gas mass proportion coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportion coefficient, the gas mass proportion coefficient and the volume of the measuring container.
Further, in step three, the volume of the human body is calculated according to the following formula:
wherein a is a pressure proportional coefficient, b is a gas mass proportional coefficient, V1To measure the original gas volume of the vessel.
Further, a is the ratio of the air pressure value obtained in the step two to the air pressure value obtained in the step one, and the air quantity injected in the step two is bn1Wherein n is1B is a gas mass proportionality coefficient, which is the amount of raw gas in the measurement vessel.
Further, after the third step, the pressure-variable human body volume measuring method further comprises the following steps:
step four, determining a correction coefficient A;
and step five, correcting the human body volume calculated in the step three by using the correction coefficient to obtain the final human body volume.
Further, the fourth step further comprises the following steps:
determining a calibration standard according to the volume obtained in the step three;
and obtaining the ratio of two air pressure data obtained by the human body and the calibration standard piece at the same temperature and the same measuring container as a correction coefficient A.
Further, after the fifth step, the method further comprises the following steps:
acquiring the weight of a human body by using a weight measuring device;
and calculating the density of the human body according to the weight and the volume of the human body.
Further, the volumes of the end of inspiration and the end of expiration of the human body are respectively calculated through the steps from the second step to the fifth step, and the average value of the volumes is calculated to obtain the volumes of the human body in three different states.
To achieve the above object, the present invention also provides a correctable pressure-variable body volume measuring system comprising:
the first air pressure measuring unit is used for measuring the air pressure value in the measuring container before the human body enters;
the second air pressure measuring unit is used for injecting a certain amount of air after a human body enters the measuring container and measuring the air pressure value in the measuring container at the moment;
and the volume calculation unit is used for determining a pressure proportion coefficient according to the pressure values in the measuring container before and after the human body enters the measuring container, determining a gas mass proportion coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportion coefficient, the gas mass proportion coefficient and the volume of the measuring container.
Compared with the prior art, the pressure-variable human body volume measuring device, the method and the system have the advantages that the human body is placed into the measuring container with the quantitative volume, the volume and the density of the human body are obtained by measuring the air pressure change of the human body entering the measuring container, the correction coefficient obtained by the calibration standard piece with the same volume as the human body is used for correcting the correction result, and the simple, quick and accurate measurement of the human body volume is realized.
Drawings
FIG. 1 is a schematic view of a pressure-variable body volume measuring device according to the present invention;
FIG. 2 is a flow chart illustrating the steps of a method of calibrating a pressure-variable body volume measurement in accordance with the present invention;
FIG. 3 is a system architecture diagram of a correctable pressure-varying body volume measuring system of the present invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a schematic structural diagram of a pressure-variable human body volume measuring device capable of correcting according to the present invention. As shown in fig. 1, the pressure-variable human body volume measuring device of the present invention comprises a measuring container 1 containing air, wherein the measuring container 1 is provided with a gas injection device 2 and a gas pressure detecting device 3, the gas injection device 2 is used for providing injected air, in the preferred embodiment of the present invention, a certain amount of air can be injected through the gas injection device 2, the gas pressure detecting device 3 is used for detecting the gas pressure value in the measuring container 1, after a human body 5 enters the measuring container 1 containing air, the gas pressure detecting device 3 measures the change of the gas pressure in the measuring container 1 before the human body enters the measuring container 1 and after the human body enters the measuring container 1 and the certain amount of air is injected, so that the volume of the human body can be calculated according to the law of afuga and the krolon-clausius equation.
Preferably, the pressure-variable human body volume measuring device of the present invention further comprises a weight measuring device 4, wherein the weight measuring device 4 is used for measuring the weight of the human body and calculating the density of the human body according to the calculated human body volume.
FIG. 2 is a flow chart illustrating steps of a method for calibrating a pressure-variable body volume measurement in accordance with the present invention. As shown in FIG. 2, the invention relates to a correctable pressure-variable human body volume measuring method, which comprises the following steps:
Step 2And 03, determining a pressure proportional coefficient according to the pressure value in the measuring container before the human body enters the measuring container and after the human body enters the measuring container and quantitative air is injected, determining a gas mass proportional coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportional coefficient, the gas mass proportional coefficient and the volume of the measuring container. In the embodiment of the invention, the pressure value before the human body enters the measuring container is assumed to be P1The pressure value after the human body enters is P2Then P is2＝aP1A is a pressure proportional coefficient, and the amount of the raw gas in the measuring container is n1The injected gas amount is bn1And b is a gas mass proportion coefficient, and then the volume of the human body is calculated according to the pressure proportion coefficient, the gas mass proportion coefficient and the volume of the measuring container according to the following formula (1):
wherein a is a pressure proportional coefficient, b is a gas mass proportional coefficient, V1To measure the original gas volume of the vessel.
Preferably, the body volumes at the end of inspiration and the end of expiration of the human body are calculated respectively through step 202 and step 203, and the average value of the body volumes is calculated to obtain the body volumes in three different states.
The derivation process of equation (1) will be described below:
according to afugard law: at the same temperature and pressure, any gas of the same volume contains the same number of molecules, and the Clapper-Clausius equation is: PV ═ nRT, all gas R values are identical. Pressure, temperature and volume are in international units (SI), then P represents pressure in: pa; v represents the volume of gas, in units: m is3(ii) a n represents the amount of substance in units: mol; t represents the thermodynamic temperature, in units: k (kelvin); r represents a gas constant, R is 8.314Pa · m3/mol·K。
Measuring the primary pressure P of the measuring vessel1；
When V isxPerson of volumeEntering the instrument, injecting bn1Air, P is obtained at this time2Measured value of (P)2＝aP1At this time, the volume V of air excluding the human body in the container is measured2Comprises the following steps:
V2＝V1-Vx
the amount of air inside the container excluding the human being was measured as:
n2＝n1+bn1-(Vx/V1)n1
by calculating as follows:
when T1 is T2 (temperature is unchanged),
presetting a measuring container: presetting the volume V of the measuring container1Is 2m3，n1Is a volume of V1Air mass of the original volume of (2 m)3) Let b be 1/10 (2m implant)31/10 air)
V2＝V1-Vx＝2m3-Vx，
The amount of air inside the container excluding the human being was measured as:
n2＝n1+bn1-(Vx/V1)n1＝n1+1/10n1-(Vx/2)n1
by calculating as follows:
when T1 is T2 (temperature is unchanged),
or:
preferably, after step 203, the present invention further comprises the following steps:
and step 205, correcting the human body volume calculated in the step 203 by using the correction coefficient to obtain the final human body volume. I.e. the corrected body volume V is: v is Vx/A.
Specifically, determining the correction coefficient a further includes the steps of:
determining a calibration standard component according to the volume obtained in step 203, in the present invention, the calibration standard component may be water or other substances, where the calibration standard component has a volume approximately equal to that of a human body, generally, for implementation convenience, it is impossible to set a calibration standard component for each human body, in this embodiment, a standard component is set for each section of volume range, for example, a calibration standard component corresponding to a volume of 1-10 cubic decimeters is 5 cubic decimeters, a calibration standard component corresponding to a volume of 10-20 cubic decimeters is 15 cubic decimeters, a calibration standard component corresponding to a volume of 20-30 cubic decimeters is 25 cubic decimeters, a calibration standard component corresponding to a volume of 30-40 cubic decimeters is 35 cubic decimeters … …, and then the calibration standard component can be determined according to the volume obtained in step 203;
and obtaining the ratio of two air pressure data obtained by the human body and the calibration standard piece at the same temperature and the same measuring container as a correction coefficient A.
Preferably, after step 205, the present invention further comprises the following steps:
the weight of the human body is obtained by using a weight measuring device, for example, the weight of the human body can be obtained by measuring with a weight detecting device such as a weight scale;
calculating the density of the human body according to the weight and the volume of the human body, specifically, the density of the human body can be obtained by the following formula:
the density of the human body is the weight of the human body/volume V of the human body.
The invention will be further illustrated by the following specific examples:
1. the human body volume is calculated by measuring the air pressure change before and after injecting quantitative air by using the fact that the human body enters a measuring container containing air according to the African plus Delov's law and the Claperons-Clavices equation, and the human body density is calculated by combining the measurement of the weight of the human body.
2. The human body volumes at the end of inspiration and the end of expiration are respectively measured, and the average value of the human body volumes is calculated to obtain the human body volumes and the human body density under three different states.
3. A correction coefficient is obtained. Because the volumes of the human body and the measuring container slightly change under different air pressures and temperatures, the reference air pressure is obtained under the same condition by utilizing the volume of the grading standard part (for example, water is used as a calibration standard part), and the ratio of two air pressure data obtained by the standard part with the same volume and the human body at the same temperature and in the same measuring container is the adjusting coefficient.
4. And obtaining the corrected human body volume and calculating the human body density.
5. The arduino microcontroller platform is used for receiving pressure and weight input of the air pressure sensor, calculating according to the formula, and recording and outputting human body volume data (the end of inspiration, the end of expiration and the average value of the two is 3) and human body density data.
FIG. 3 is a system architecture diagram of a correctable pressure-varying body volume measuring system of the present invention. As shown in fig. 3, the present invention provides a correctable pressure-variable body volume measuring system comprising:
a first air pressure measuring unit 301 for measuring the air pressure in the measuring container before the human body enters, in the embodiment of the present invention, before the human body enters, the measuring container has an original fixed amount of air therein, and the first air pressure measuring unit 301 can measure the pressure value P in the measuring container at that time by using the air pressure detecting device1。
The second air pressure measuring unit 302 injects a certain amount of air after the human body enters the measuring container, and measures the air pressure value in the measuring container at this time. In the embodiment of the invention, after a human body enters the measuring container, the gas which is in a certain proportion to the original quantity of the gas in the measuring container is injected by the gas injection device, and the pressure value P in the measuring container at the moment is obtained by the detection of the gas pressure detection device2. In the present invention, the gas is air, and the amount of air in the measuring container is n1The amount of air injected is bn1Measuring the pressure value P in the measuring container at the moment2。
The volume calculation unit 303 is configured to determine a pressure proportionality coefficient according to pressure values in the measurement container before and after the human body enters the measurement container, determine a gas mass proportionality coefficient according to the amount of the injected gas and the amount of the raw gas in the measurement container, and calculate a volume of the human body by using the pressure proportionality coefficient, the gas mass proportionality coefficient, and the volume of the measurement container. In the embodiment of the invention, the pressure value before the human body enters the measuring container is assumed to be P1The pressure value after the human body enters is P2Then P is2＝aP1A is a pressure proportional coefficient, and the amount of the raw gas in the measuring container is n1The injected gas amount is bn1And b is a gas mass proportion coefficient, and then the volume of the human body is calculated according to the pressure proportion coefficient, the gas mass proportion coefficient and the volume of the measuring container according to the following formula (1):
wherein a is a pressure proportional coefficient, b is a gas mass proportional coefficient, V1To measure the original gas volume of the vessel.
Preferably, the second air pressure measuring unit 302 and the volume calculating unit 303 are used to calculate the volumes of the human body at the end of inspiration and the end of expiration, respectively, and calculate the average value thereof to obtain the volumes of the human body in three different states.
Preferably, the pressure-variable human body volume measuring system of the present invention further comprises:
a correction coefficient determination unit 304 for determining a correction coefficient a;
the volume calibration unit 305 corrects the human body volume calculated by the volume calculation unit 303 by using the correction coefficient, and obtains the final human body volume. I.e. the corrected body volume V is: v is Vx/A.
Specifically, the correction coefficient determination unit 304 may be implemented by:
the calibration standard is determined according to the volume obtained by the volume calculation unit 303, and in the present invention, the calibration standard may be water, and a standard approximately equal to the volume of the human body is selected. Generally, for convenience of implementation, it is impossible to set a calibration standard for each human body, and in this embodiment, a standard room is set for each section of volume range, for example, a volume of 1-10 cubic decimeters corresponds to a calibration standard of 5 cubic decimeters, a volume of 10-20 cubic decimeters corresponds to a calibration standard of 15 cubic decimeters, a volume of 20-30 cubic decimeters corresponds to a calibration standard of 25 cubic decimeters, and a volume of 30-40 cubic decimeters corresponds to a calibration standard of 35 cubic decimeters … …, so that a volume determination calibration standard can be obtained according to the volume calculation unit 303;
and obtaining the ratio of two air pressure data obtained by the calibration standard part and the human body at the same temperature and the same measuring container as a correction coefficient A. For example: a ═ P/P2And P is the air pressure value of the calibration standard under the corresponding environment.
Preferably, the pressure-variable human body volume measuring system further includes a density calculating unit 306, which obtains the weight of the human body by using the weight measuring device, and calculates the density of the human body according to the weight and the volume of the human body. For example, the weight of the human body may be measured using a weight detecting device such as a weight scale, and the obtained density may be calculated by the following equation:
the density of the human body is the weight of the human body/volume V of the human body.
In summary, the pressure-variable human body volume measurement device, method and system of the present invention can measure the volume of a human body simply, rapidly and accurately by placing the human body in a measurement container containing a fixed amount of air, obtaining the volume and density of the human body by measuring the air pressure change of the human body entering the measurement container, and correcting the correction result by using the correction coefficient obtained by the calibration standard component having the same volume as the human body.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (7)
1. A correctable pressure-variable human body volume measuring method comprises the following steps:
measuring the air pressure value in a measuring container before a human body enters the measuring container;
step two, enabling a human body to enter a measuring container, injecting a certain amount of air, and measuring the air pressure value in the measuring container at the moment;
determining a pressure proportional coefficient according to the pressure change in the measuring container before the human body enters the measuring container and after the human body enters the measuring container and air is injected, determining a gas mass proportional coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportional coefficient, the gas mass proportional coefficient and the volume of the measuring container;
in the third step, the volume of the human body is calculated according to the following formula:
wherein a is a pressure proportional coefficient, bIs a gas mass proportionality coefficient, V1To measure the original gas volume of the vessel.
2. A correctable pressure-variable human body volume measuring method according to claim 1, wherein: a is the ratio of the air pressure value obtained in the step two to the air pressure value obtained in the step one, and the air quantity injected in the step two is bn1Wherein n is1B is a gas mass proportionality coefficient, which is the amount of raw gas in the measurement vessel.
3. A correctable pressure-variable human body volume measuring method according to claim 1, wherein after step three, the pressure-variable human body volume measuring method further comprises the steps of:
step four, determining a correction coefficient A;
and step five, correcting the human body volume calculated in the step three by using the correction coefficient to obtain the final human body volume.
4. A correctable pressure-variable body volume measuring method according to claim 3 wherein step four further comprises the steps of:
determining a calibration standard according to the volume obtained in the step three;
and obtaining the ratio of two air pressure data obtained by the human body and the calibration standard piece at the same temperature and the same measuring container as a correction coefficient A.
5. A correctable pressure-variable human body volume measuring method according to claim 3, further comprising, after step five, the steps of:
acquiring the weight of a human body by using a weight measuring device;
and calculating the density of the human body according to the weight and the volume of the human body.
6. A correctable pressure-variable human body volume measuring method according to claim 3, wherein: and respectively calculating the volumes of the end of inspiration and the end of expiration of the human body through the second step to the fifth step, and calculating the average value of the volumes to obtain the volumes of the human body in three different states.
7. A correctable pressure-variable body volume measuring system comprising:
the first air pressure measuring unit is used for measuring the air pressure value in the measuring container before the human body enters;
the second air pressure measuring unit is used for injecting a certain amount of air after a human body enters the measuring container and measuring the air pressure value in the measuring container at the moment;
the volume calculation unit is used for determining a pressure proportion coefficient according to pressure values in the measuring container before and after the human body enters the measuring container, determining a gas mass proportion coefficient according to the injected gas quantity and the original gas quantity in the measuring container, and calculating the volume of the human body by using the pressure proportion coefficient, the gas mass proportion coefficient and the volume of the measuring container;
wherein, the volume calculating unit calculates the volume of the human body according to the following formula:
wherein a is a pressure proportional coefficient, b is a gas mass proportional coefficient, V1To measure the original gas volume of the vessel.
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| CN107252315A (en) | 2017-10-17 |
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