CN101703403B - Device and method for measuring human energy consumption - Google Patents

Abstract

A human body energy consumption measuring device and method belong to the technical field of daily fitness auxiliary equipment. The invention consists of a pyroelectric element and a Fresnel lens covering it to form an infrared detector. The infrared rays radiated by the human body within the detection range are incident on the pyroelectric element through the Fresnel lens, and the pyroelectric element generates The electrical signal corresponding to the human body movement form, the electrical signal is amplified by the amplifier circuit to obtain an analog voltage signal, the analog voltage signal enters the data acquisition circuit and is converted into a digital signal, and the digital signal is then analyzed and processed by the digital signal processing circuit. Realize the counting of human motion actions and frequency and input the data into the human body energy consumption calculation unit, and at the same time input the sports body parameters into the human body energy consumption calculation unit through the human body parameter input unit, and use the empirical formula to calculate the energy consumption value caused by human body movement. The device and method can be used as auxiliary equipment for daily body-building activities.

Description

Device and method for measuring human energy consumption

technical field

The invention relates to a daily body-building auxiliary device, in particular to a device and method for measuring energy consumed by human body movement by using pyroelectric elements.

Background technique

With the improvement of living standards, the importance of fitness activities has been recognized by more and more people, and the demand for fitness aids is also showing a rapid upward trend. From the point of view of the fitness effect, it is better to know the value of human energy consumption caused by specific exercise and use it for the guidance and control of fitness activities than pure fitness activities. Therefore, testing and estimating the energy consumption of human exercise is very important for guiding scientific fitness.

The precise test of human energy consumption is very complicated, and often requires expensive test instruments and complicated test procedures to obtain more accurate results. It is generally used in highly professional occasions such as athlete training. It is not practical for the general population. Therefore, in practical applications, some simple test methods and instruments, or simple calculation formulas are mainly used for estimation. At present, the commonly used estimation methods are empirical formulas obtained from statistics, such as common running sports, swimming, badminton, etc., and the estimated value of energy consumption can be obtained by multiplying the duration of continuous exercise by an empirical coefficient. This method is simple to operate, but the accuracy is not high, and the specific motion form needs to be known. Another common test instrument is a pedometer with the function of calculating the energy consumed by the human body, which estimates the energy consumed by measuring the number of steps the human body walks. However, this pedometer only uses the sum of the number of walking steps to calculate the energy signal, and the speed of the human body's walking speed actually has a great impact on the energy consumption of the human body. In addition, this kind of device must be worn vertically on the human body during exercise, which is not only inconvenient to use, but also cannot sense the movement of the upper limbs of the human body, such as turning around, twisting the waist, etc., which can also consume human energy.

Aiming at the shortcomings of the above-mentioned prior art, the present invention adopts an infrared measurement method, by measuring the infrared signal change corresponding to the human body movement, sensing the information of the human body movement, and realizing the estimation of the energy consumption of the human body movement.

The pyroelectric element is combined with the Fresnel lens covering it to form an infrared detector, which can convert the infrared energy radiated by the human body within the detection range into electrical signals. When the human body is still within the detection range, the sensor has no output. When the human body moves within the detection range, the sensor outputs a dynamically changing electrical signal corresponding to the law of human motion. Therefore, this sensor is also called a human motion sensor.

The production cost of the human motion sensor is low, and it is widely used in anti-theft alarms, automatic lighting in public places, and the like.

FIG. 1 shows a typical configuration of such a human motion detection device in the prior art. Infrared rays radiated by the human body 1 within the detection range are incident on the surface of the pyroelectric element 3 after passing through the Fresnel lens 2 . The generated electrical signal is amplified by the amplifying circuit 4 to obtain an analog voltage signal 5 . The analog voltage signal 5 enters a comparator circuit 7 . The comparator circuit 7 compares the input electrical signal with the threshold voltage provided by the threshold voltage circuit 6. If the amplitude of the electrical signal exceeds the threshold voltage range, the comparator circuit 7 provides a binarized signal 8, which is held by the signal. After the circuit 9, it is converted into a switch signal 10, which drives the subsequent controlled device 11 to generate actions such as switching and alarming.

The biggest feature of this application is the use of the comparator circuit 7 . The detection device gives the switch signal of the presence or absence of a moving human body within the detection range by comparing the threshold voltage, and triggers the alarm circuit of the subsequent stage or other actuators to work.

Contents of the invention

There are many deficiencies in the prior art for measuring the energy consumption of human body movement. The invention utilizes a low-cost pyroelectric infrared sensor, adopts an infrared measurement method, and senses information about human body movement by measuring infrared signal changes corresponding to human body movement, thereby realizing the estimation of energy consumption of human body movement.

Technical scheme of the present invention is as follows:

A human body energy consumption measurement device, characterized in that the device includes a Fresnel lens, a pyroelectric element, an amplification circuit, a data acquisition circuit, a digital signal processing unit, a human body parameter input unit, a human body energy consumption calculation unit, and a display record unit; the Fresnel lens is covered on the pyroelectric element, the output port of the pyroelectric element is connected with the input port of the amplifying circuit, the output port of the amplifying circuit is connected with the input port of the data acquisition circuit, and the data acquisition The output port of the circuit is connected with the input port of the digital signal processing unit, the output port of the digital signal processing unit and the output port of the human body parameter input unit are connected with the input port of the human body consumption energy calculation unit, the output port of the energy consumption calculation unit is connected with the Shows that the recording unit is connected.

A method for measuring human body energy consumption provided by the invention is characterized in that the method comprises the following steps:

1) The infrared ray radiated by the human body passes through the detection system composed of Fresnel lens and pyroelectric element in turn, and outputs an electrical signal, and the electrical signal is amplified by the amplifier circuit to obtain an analog voltage signal;

2) The analog voltage signal is converted into a digital signal through the data acquisition circuit;

3) The digital signal goes through the digital signal processing circuit for peak finding and frequency domain analysis to realize action counting and frequency counting;

4) Input the movement count and frequency count, as well as the gender, height and weight parameters of the human body into the energy consumption calculation unit of the human body, and the energy consumption calculation unit of the human body estimates the energy value consumed by the human body movement according to the following empirical formula;

Male: walking energy consumption/kcal=0.53H+0.58W+0.37F+1.51T-145.03;

Women: walking energy consumption/kcal=0.003H+0.45W+0.16F+0.39T-12.93;

Among them: H means height/cm; W means weight/kg; F means step frequency/steps per minute; T means time/min.

5) The energy value consumed by human body movement is transmitted to the display and recording unit for data display and recording.

Compared with the prior art, the present invention has the following advantages and outstanding effects: the device of the present invention is used to measure the energy consumption in the process of human body movement, and the human body does not need to wear any device, as long as it can move freely within the detection range of the sensor, it can be used It is more convenient and very suitable for impromptu sports indoors. Moreover, the cost of the device of the invention is extremely low, the power consumption is extremely small, and the algorithm is also very simple.

Description of drawings

FIG. 1 is a typical configuration of an existing human motion detection device.

Fig. 2 is a working principle diagram of the device of the present invention.

Figure 3 is a typical signal when the human body is in motion.

Figure 4 is a flow chart of the peak-seeking algorithm.

Figure 5 is the stepping signal in the example.

Fig. 6 is a Fourier spectrum analysis diagram of the stepping signal in the example.

In the figure: 1-human body; 2-Fresnel lens; 3-pyroelectric element; 4-amplification circuit; 5-analog voltage signal; 6-threshold voltage circuit; 7-comparator circuit; 8-binary signal ;9-signal holding circuit; 10-switch signal; 11-controlled device; 12-data acquisition circuit; 13-digital signal processing circuit; 14-human body parameter input unit; 15-human body energy consumption calculation; 16-display record unit ; 17-signal when the human body is still; 18-signal peak; 19-signal valley.

Detailed ways

The working principle and specific implementation process of the present invention will be described in detail below in conjunction with the explanatory diagrams.

Fig. 2 is a working principle diagram of the device of the present invention, which includes a Fresnel lens, a pyroelectric element, an amplifier circuit, a data acquisition circuit, a digital signal processing unit, a human body parameter input unit, a human body consumption energy calculation unit and a display recording unit ; The Fresnel lens is covered on the pyroelectric element, the output port of the pyroelectric element is connected with the input port of the amplifying circuit, the output port of the amplifying circuit is connected with the input port of the data acquisition circuit, and the data acquisition circuit The output port of the digital signal processing unit is connected to the input port of the digital signal processing unit, the output port of the digital signal processing unit and the output port of the human body parameter input unit are connected to the input port of the human body energy consumption calculation unit, and the output port of the energy consumption calculation unit and the display The recording unit is connected.

The present invention uses pyroelectric sensors to detect human body motion information, counts motions through peak-seeking algorithms, and counts frequencies through Fourier analysis, and then uses the existing empirical formulas for energy consumption of human body motions to estimate the energy consumed by human motion .

The infrared ray radiated by the human body 1 is amplified by the Fresnel lens 2 , the pyroelectric element 3 , and the amplifier circuit 4 , and the output voltage signal 5 is converted into a digital signal by the data acquisition circuit 12 . The typical motion signal actually detected is shown in Figure 3, and the information of the motion peak is the main information. Fig. 4 is a flow chart of the peak finding algorithm. The peak-seeking algorithm is the core algorithm of the method of the present invention, which can realize the counting of actions in the process of human body movement. Use the digital signal processing unit 13 to perform motion counting and frequency counting through peak finding and frequency analysis to obtain the number of motions N and the frequency of motions F, which are passed to the human body energy consumption calculation unit 15, and at the same time, the parameters of gender, height and weight of the human body are passed through The parameter input unit 14 inputs the human body energy consumption calculation unit 15, and the human body energy consumption calculation unit estimates the energy value consumed by human body movement according to the following empirical formula:

Male: walking energy consumption/kcal=0.53H+0.58W+0.37F+1.51T-145.03;

Women: walking energy consumption/kcal=0.003H+0.45W+0.16F+0.39T-12.93;

Among them: H means height/cm; W means weight/kg; F means step frequency/steps per minute; T means time/min.

Finally, the energy value consumed by human body movement is transmitted to the display and recording unit for data display and recording.

Example

As an illustrative example, FIG. 5 is a signal collected when a volunteer steps forward at a walking speed facing the Fresnel lens 2 . In FIG. 5 , the signal curve section 17 is the signal when the human body is still, and the signal peak 18 and the signal valley 19 correspond to the signals when the human body walks 1 step and 2 steps respectively. Use the peak-seeking algorithm to obtain the number of actions N=20; Figure 6 is the signal spectrum obtained by Fourier analysis of the time-domain signal in Figure 5. It can be seen from Figure 6 that the signal frequency is 0.8Hz, and the step frequency is F= 60*0.8*2=96 steps/min. The exercise time is T=20/96=0.21min; the volunteer is a male, with a weight of 70kg and a height of 185cm; input these parameters into the calculation unit, according to the empirical formula:

Walking energy expenditure/kcal＝0.53H+0.58W+0.37F+1.51T-145.03

=0.53×185+0.58×70+0.37×96+1.51×0.21-145.03

＝29.46/kcal

Claims (2)

1. energy consumption of human body measuring device, it is characterized in that this device comprises Fresnel lens (2), pyroelectricity element (3), amplifying circuit (4), data acquisition circuit (12), digital signal processing unit (13), human parameters input block (14), human consumption energy calculation unit (15) and shows record cell (16); Described Fresnel lens covers above the pyroelectricity element, the output port of pyroelectricity element is connected with the input port of amplifying circuit, the output port of amplifying circuit is connected with the input port of data acquisition circuit, the output port of data acquisition circuit is connected with the input port of digital signal processing unit, the output port of the output port of digital signal processing unit, human parameters input block is connected with the input port of human consumption energy calculation unit, and the output port of energy expenditure computing unit is connected with the demonstration record cell.

2. the energy consumption of human body measuring method that employing is installed according to claim 1 is characterized in that this method comprises the steps:

1) infrared ray that gives off of human body (1) detection system through forming successively by Fresnel lens and pyroelectricity element, the output signal of telecommunication, the signal of telecommunication obtain analog voltage signal (5) after amplifying through amplifying circuit;

2) analog voltage signal (5) is converted to digital signal through data acquisition circuit;

3) digital signal carries out peak-seeking and frequency-domain analysis through digital signal processing unit, realizes action counting and frequency counting;

4) will move counting and frequency counting, and the sex of human body, height and body weight parameter input human consumption energy calculation unit, the human consumption energy calculation unit estimates the energy values that human motion consumes according to following empirical equation;

Male: walking energy expenditure/kcal=0.53H+0.58W+0.37F+1.51T-145.03;

Women: walking energy expenditure/kcal=0.003H+0.45W+0.16F+0.39T-12.93;

Wherein: H represents height/cm; W represents body weight/kg; F represents step frequency/step number per minute; T express time/min;

5) energy values that human motion consumed is sent to the demonstration record cell and carries out data show and record.

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