3. 1 awareness sensor studies (step 3-2)
Sensors defined by national standards (gb7665-87) are devices or devices that can feel the requirements being measured and that are converted to usable signals according to certain patterns, usually by, and
Composition.
Sensors are a device that can feel a measured message and detect it
The output of the information is changed by a certain pattern, or in any other form required to satisfy the information, process, process
., showing, recording, etc.
Sensors can be classified according to three different methods: (1) by classification; and (2) by
Classification; (3) by classification.
To address the lighting of the building, a sensor was installed in the building to connect with the electrical circuit that controlled the lights. Province
When there's movement inside and sound, the light is lighted by the power, the sensor is the sensor, it enters
It's a signal, which, after transposing the sensor, is a signal.
(alternative) where the following instruments or devices are used for sensors ()
B. Scales
C. Television remote control d. Seconds
Sensor is an important device for collecting information, as shown in figure 1, which is an electrocapacitator for measuring pressure. Pass
Sensors, when pressure f is to be measured on an actionable membrane electrode, can cause a disfigurement of the membrane, cause a change in the capacitor, a sensitive currentometer and a chain of power sources into closed circuits. ()
Solid tether exchange
'f. Film electrode
Figure 1
A. If f presses up the membrane electrode, the capacitation will be reduced
If the current meter has an indicator, pressure f changes
If the current meter passes right, pressure f increases
D. The current meter is passing right, and pressure f is decreasing
Placing a barrier in front of the elevator will reveal that the elevator doors are kept open because the sensors on the elevator door are ( )
B. Temperature sensors
C. Acoustic sensors d. Pressure sensors
Classroom exploration..
"conceptual law practice"
The working principles of an electric microphone with a knowledge point
(dual selection) capable microphones have a better degree of insulation than mobile microphones. Expenditure
Capacitors, thin metallic membrane m and fixed electrodes n form a capacitor, charged with direct currents ... When the acoustics cause the membranes to vibrate, the capacitor changes, the currents form on the circuits. As the membranes move to the right, there are ()
250 v
Figure 2
A. Larger and smaller b. Smaller
C. L. A. Has a current to the left
(alternative) as shown in figure 3, fixed metal sheet on the right side of the capacitor microphone b and capable of acoustic motion source
Vibration metallicly plating metallic membrane a) forms a capacitor, a) and b) by a conductor and a constant power source, respectively
Extreme interface. S-doping x=asin2oon vibrate, yes
The strength of the electric field between a. A. Vibrating a. B
B. The current frequency in the conductor is 2000hz
The current frequency in the pipeline is 1000 hz
A when moving to the right maximum, the maximum capacitation formed by a, b plates
Knowledge point 2 hole component
3 . As shown in figure 4, current i flowed over long cube metal blocks, metal blocks were d wide, b high, with a equilibrium magnetic field piping with a magnetic sensitivity of b right in front of the paper, with a free number of electrons in a metal block volume of n, asking: above and below the metal block
What's the difference
Figure 4
Figure 5 shows the rationale for the hole component. If the thickness of the film is shown in d, k is the hole coefficient, for a hole component d, k is the constant value, and if i remain constant, then the changes of uh with b can be verified. The following statement is incorrect: (performance refers to larger plane)
Figure 5
A. Gradually approaching a magnetic pole of the permagnetic on the working side of the hole, and uh will be larger
B. The working surface of the hole element should be maintained in measuring the strength and weakness of the magnetic field at the earth's two poles
C, when measuring the strength of the magnetic field on the earth's equator, the work surface of the hole element should remain horizontal
D. Change the angle of the magnetic sensor line and the working face of the hole component, uh will change
Methodological skills
Analysis techniques for sensor circuits
5 . Electromagnetic induction was applied to both the motion loop and the tape recorder. Figure 6 a shows the logic of the microphone, figure b
This is a recording and sounding of the recorder
Yang sounder
When the microphones work, the magnets are still, and the wires move, and they create a sensor current
The magnetic field that changes when the tape recorder plays creates a sensor current in the static circuit
A magnetic field where the current changes in the ring when the recorder plays
The electrons that change in the loop during the tape recorder flow in a magnetic field that changes at the edge of the magnetic head
Of which right is ()
A. 234 b. 123
C. 124 d. 134
6 • ab is a flat-line resistance with a resistance value r, length, as illustrated by figure 7
For l, there's two slide heads, pi, p2, and pi is able to move up and down at the same level as the vertical insulation pole, and when the spring is long, pi points to the "a" end, pi is attached to the tray, if the p2 goes out
Current voltage, the voltage is amplified and the size of the gravity of the object will be displayed on the display screen by signal conversion... The spring is known to have a power factor of k, the tray has its own mass of mo, power power of e, internal resistance, local gravity acceleration of g
Figure 7
When the object is not on the tray, pi is x-nine at the distance of a by gravity of the tray itself
(b) the distance of pi from a x2 when objects of mass of m are placed on the tray
(3) when an object is not on the tray, it is usually calibrated to zero points by adjusting the p2 so that the p2 distance from a is xi, so that the voltage between pi and p2 is zero
References
Pre-school training
• sensitive elements
• monitoring information telecommunications transmission storage controls
The method of energy transfer of measured principles
Sound
Ac6. Bc
7. D
When the elevator doors touch people or other obstacles, close the doors immediately in order to prevent crowding, so it's pressure sensors.
Classroom exploration
1. Ac
The capacitor formulac = 4nd knows that when the film moves to the right, the distance between the poles of the capacitors becomes smaller, the capacitor becomes larger, the power is charged to the capacitors, and the current flows in the direction of the positive pole of the power source to the negative pole
Ab has a left current.
Cd
A during vibration, changes in a. B. Spacing, which are known by the parallel plate capacitors formula c, and a
When you move to the right to the maximum, a, b plates have the largest capacitor, wrong a, wrong d; during vibration, the capacitor is charged and the current frequency in the conductor is consistent with a vibration frequency, correct c, wrong b.
Point evaluation of the thin metallic membrane and fixed electrodes of the electromechanical microphone to form a capacitor, which, when charged, causes the acoustic vibration of the membrane,
The capacitation changes, the current changes.
It's a free charge, so it's left-handed to determine an upward bias, and the upper surface is a negative charge
The surface has an additional positive charge of the same amount, so the surface is high and has a stable voltage
Point is, when the current flows in the conductor, the motion charge is under the influence of lorenz, on the upper and lower surfaces of the conductor. Party
Qe = qvb will not be charged when the motor charge (q) is balanced by the power of the field with the lorenzian force
Turn up or down and create stable voltage between the upper and lower surfaces.
Ib
Based on formula uh = k〒, it can be seen that when magnetic extremes are close to the working surface of the hole component, b is larger, uh is larger and option a is correct; in the vicinity of the earth's polar poles, the geomagnetic field is considered vertically to the horizontal surface, the work of the hole component
Altitude is maintained, option b is correct; on the equator, the geomagnetic field is parallel to the horizontal level. No voltage is generated if the work surface of the hole element is maintained at the level, option c is incorrect; changing the angles of the magnetic line and the workspace of the hole element is equivalent to changing the hole coefficientk, and uh will change, option d is correct; therefore choosing c.
A little evaluation of hole's element that converts the magnetic strength of the magnetic strength to the electro-voltage of the electron, the voltage and the magnetic intensity
Relationship is u h = kb.
It works by the sound waves that force metallic wires to vibrate in magnetic fields produced by magnets to generate induction currents
One is correct; during the recording, the sensor current generated by the microphone is amplified by the magnification circuit and changes in the magnetic zone of the recorder's head. Four is correct; the tape produces the sensor current through the modified magnetic field at the time of the recording, and then is sent to yen after the magnification circuit
2 on the speaker, correct.
Mog jm+mog, kl
(1) only (2) plant (3) m = u
The movement of the tray is driven by pi, which causes a power differential between pi and f2, and the size of the power differential reflects the tray direction
The size of the lower moving distance, which is proportional to the length due to r's flat-line resistance
(1) balance knowledge by strength m°g = kxi, solved xi =
(2) rebalancing of heavy matter m°g+ mg=kx2
By closed circuit orm, e=ir, by partial circuit orm, u=ir
R string x
100 = x, where x is the distance between pi and p2, then
R l
I'm sorry
United
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Four points to take into account in summing up the analysis of sensors
(1) sensation analysis
To specify the amount of physics that the sensor feels, such as force, heat, light, magnetic, sound, etc.
(2) analysis of output signals
Identify the sensitive elements of the sensor, analyze its input and output signals, and between the input and the output signals
Change patterns.
Circuit structure analysis
A careful analysis of the circuit structure of the sensor, based on familiarization with the working characteristics of the commonly used electronic components, an analysis of circuit transmission
The pattern between the signal and the input.
Analysis of the work of implementing agencies
Sensor applications, including not only the process of conversion of non-electricity to electron, but also information based on available information
Controlling the process of implementation of the work of the implementing agencies.
