What are the software for mobile phone pedometers?
1. Vibration sensor
The main function of the vibration sensor is to The amount is received and converted into a proportional amount of electricity. Since it is also an electromechanical conversion device, we sometimes call it a transducer, a vibration pickup, etc. The vibration sensor does not directly convert the original mechanical quantity to be measured into electricity, but uses the original mechanical quantity to be measured as the input quantity of the vibration sensor, and then receives it by the mechanical receiving part to form another mechanical quantity suitable for conversion. , and finally the electromechanical conversion part converts it into electricity. Therefore, the working performance of a sensor is determined by the working performance of the mechanical receiving part and the electromechanical conversion part. The structural classification of vibration sensors is as follows:
(1) Relative type
The electric sensor is based on the principle of electromagnetic induction, that is, when the moving conductor moves When magnetic lines of force are cut in a fixed magnetic field, an electromotive force is induced at both ends of the conductor. Therefore, the sensor produced using this principle is called an electrodynamic sensor. The relative electric sensor is a displacement sensor based on the mechanical receiving principle. Since the electromagnetic induction law is applied in the electromechanical transformation principle, the electromotive force generated is proportional to the measured vibration speed, so it is actually a speed sensor.
(2) Eddy current type
The eddy current sensor is a relative non-contact type sensor, which measures the vibration displacement or amplitude of an object through the change in distance between the end of the sensor and the object being measured. Eddy current sensors have the advantages of wide frequency range (0 ~ 10kHZ), large linear working range, high sensitivity and non-contact measurement. They are mainly used for static displacement measurement, vibration displacement measurement, and vibration measurement of rotating shafts in rotating machinery.
(3) Inductive type
Based on the relative mechanical receiving principle of the sensor, the inductive sensor can convert the changes in the measured mechanical vibration parameters into Changes in electrical parameter signals. Therefore, there are two forms of inductive sensors, one is variable gap, and the other is variable magnetic permeability area.
(4) Capacitive
Capacitive sensors are generally divided into two types. That is, variable gap type and variable common area type. Variable gap type can measure straightDisplacement of line vibration. The variable area type can measure the angular displacement of torsional vibration.
2. Gravity sensor
Gravity sensor, also known as gravity sensor, uses elastic sensitive components to make cantilever-type displacers, and uses elastic The energy storage spring made of sensitive components drives the electrical contacts to complete the conversion from gravity changes to electrical signals. At present, most smartphones and tablets have built-in gravity sensors, which can complete functions such as step counting and playing simulation games.
Gravity sensors work based on the principle of piezoelectric effect. For heteropolar crystals that do not have a symmetry center, the external force exerted on the crystal will not only deform the crystal, but also change the polarization state of the crystal and establish an electric field inside the crystal. This phenomenon causes the medium to polarize due to mechanical force. It is called the positive piezoelectric effect.
The gravity sensor takes advantage of its internal crystal deformation caused by acceleration. Since this deformation generates a voltage, the acceleration can be converted into a voltage output simply by calculating the relationship between the generated voltage and the applied acceleration. Of course, there are many other methods to make acceleration sensors, such as capacitance effect, thermal bubble effect, and light effect, but the most basic principle is that acceleration produces deformation of a certain medium, and the deformation is measured and converted into voltage output.
3. Acceleration sensor
The acceleration sensor is a sensor that can measure acceleration. It usually consists of mass block, damper, elastic element, sensitive element and adjustment circuit. During the acceleration process, the sensor uses Newton’s second law to obtain the acceleration value by measuring the inertial force exerted on the mass block. Depending on the sensor sensitive components, common acceleration sensors include capacitive, inductive, strain gauge, piezoresistive, piezoelectric, etc.
The acceleration sensor can detect AC signals and the vibration of objects. When people walk around, they will produce certain regular vibrations, and the acceleration sensor can detect the zero-crossing point of the vibration, thereby calculating the steps or steps taken by the person. The number of steps taken while running is calculated, and the displacement moved by the person is calculated to complete the work of the pedometer, and the calorie consumption can be calculated using a certain formula.
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