The dynamic characteristics of a sensor refer to the characteristics of the output of the sensor when the input changes. In practical work, the dynamic characteristics of the sensor are often indicated by its echo to some normative input signals, because the echo of the sensor to the normative input signal is easy to obtain by experimental methods, and there is a certain relationship between its response to the normative input signal and its response to the arbitrary input signal, and the commonly used normative input signal has two kinds of step signal and sinusoidal signal, so the dynamic characteristics of the sensor are also often indicated by step echo and frequency echo.
The linearity of our sensors is that the practical static characteristic output of the sensor is usually a curve rather than a straight line. In practice, in order to make the appearance have a uniform scale reading, a characteristic curve representing the practice of a fitting straight line approximation is often used, and the linearity (nonlinear error) is a performance indicator of this approximation. There are several ways to select a fitting line. For example, the theoretical straight line with zero input and full-scale output, and the connection of points is used as the fitting line; Or the theoretical straight line with the square of the deviation from each point on the characteristic curve is Z small as the fitting line, and this fitting line is called the Z small squares fitting line.
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Introduction of photoelectric switches for sensors
Photoelectric switches are what we generally call sensors. **Standard GB7665-87 defines a sensor as: a device or device that can sense the specified measured part and convert it into a usable signal in accordance with certain rules, which is generally composed of a sensitive element and a conversion element.
The sensor is a ...
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Encoder classification form
1. Classification according to the way of engraving the disc is different
(1) Incremental type: that is, every time the viewpoint of the unit is rotated, a pulse signal is announced (there is also a sine and cosine signal, and then it is subdivided, and the pulse with a higher frequency is chopped), which is generally output for phase A, phase B and Z, and phase A and phase B are ...
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The difference between fiber optic sensors and photoelectric sensors – we are blessed
Optical fiber sensor and photoelectric sensor are two typical sensors, which are widely used in production and measurement, so what is the difference between the two?
Fiber optic sensor skills are developed on the basis of fiber optics, optical communications, and optoelectronic skills, and electromagnetic...
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Motor control requires encoders for reasons – and we are blessed
The motor control loop is mainly composed of a motor, a controller, and a directional response interface. The motor rolls the rotating shaft and drives the robotic arm to move. The motor manipulator controls when the motor applies force, stops, or continues to roll. The azimuth interface in the loop supplies the rotational speed and azimuth information to the controller ...
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Test method for sensor output
1. Test for NPN output sensor
The NPN sensor output, also known as OC gate output, is based on the principle of open collector output of a transistor.
The principle of NPN type OC gate output is whether the output of the NPN transistor and GND are short-circuited. When the transistor is turned on, the output and GND ( ...
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Auxiliary mechanical device installation form - double blessing
Auxiliary mechanical devices: commonly used are rack and pinion, chain belt, friction runner, rope reeling machinery, etc.
Low-speed end device: installed behind the reduction gear, such as the shaft end of the winch wire rope drum or the shaft end of the next reduction gear ...
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P+F proximity switch selection points
1. Select the proximity switch type according to the detected object. If the detection object is metal, the inductive proximity switch is preferred, and if the detection object is a non-metal such as wood, plastic, paper, water, etc., or a smaller and finer metal, a capacitive proximity switch should be selected.
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Precautions for pressure sensors – a blessing
1. Avoid scum deposited in the catheter and contact the transmitter with corrosive or overheated media.
2. When measuring the gas pressure, the pressure port should be opened at the top of the process pipeline, and the transmitter should also be installed at the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process.
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Instructions for setting up the ultrasonic function
Instructions for setting up the ultrasonic function: The LED shows the setup process. The green light flashes and the target is found; The target did not notice a red ED flash; The connection setting is tucked into place and the T is set. Once the setup process is complete, the sensor works normally.
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The FDH-1 simplifies bus installation
1. Mastery: Take control of your bus
The handheld bus diagnostic device FDH-1 can be regarded as an increasingly intelligent multimeter. It only needs to press a button to quickly view any network segment. And it can work independently, which is a good addition to the engineer's stuff box.
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Commonly used sensor type – Doublebless
1. Semiconductor type Semiconductor gas sensor is a gas sensor that uses semiconductor gas sensing elements as sensitive elements, which is the most common gas sensor, widely used in combustible gas leakage detection equipment in homes and factories, and is suitable for the detection of methane, natural gas, liquefied gas, hydrogen, etc.
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Installation and assembly of ultrasonic sensors
Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs), where ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be taken into account when installing and assembling ultrasonic sensors?
Ultrasonic ...
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P+F proximity switch selection
1. Select the type of proximity switch according to the detected object. If the detection object is metal, the inductive proximity switch is preferred, and if the detection object is non-metal such as wood, plastic, paper, water, etc., or smaller and finer metals, the capacitive proximity switch should be selected.
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Wiring of weighing strain gauge tension and compression sensors – we are in control
Wiring method of weighing strain tension and compression sensor:
Strain gauge tension and compression load cells can be wired in two different input and output wiring methods:
The first is the four-wire connection method.
The load cell of the four-wire connection method has no special requirements for the secondary instrument panel, and it is very convenient to use.
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The proximity switch determines the key points of the model
1. Select the type of proximity switch according to the detected object. If the detection object is metal, the inductive proximity switch is preferred, and if the detection object is non-metal such as wood, plastic, paper, water, etc., or smaller and finer metals, the capacitive proximity switch should be selected.
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Ultrasonic level gauge installation principle
1. The interval from the launch surface of the probe to the liquid level should be smaller than the range of the purchased surface.
2. The interval between the launch surface of the probe and the highest liquid level should be greater than the blind area of the purchased surface.
3. The launch surface of the probe should be parallel to the surface of the liquid.
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Common faults of displacement sensors – we are blessed
The working principle of the straight line is the same as that of the sliding rheostat, it is used as a voltage divider, it is the actual orientation of the measured direction with the relative output voltage. There are the following requirements for the operation of this equipment:
1 ...
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Displacement sensor failure solution - double blessing
(1) Electronic ruler
When the electronic ruler is used to a certain moment, in the face of aging problems, we should pay attention to the fact that if the seal is now aged, and there are many impurities, water mixtures and oil, then it will affect the touch resistance of the brush, resulting in the continuous beating of the displayed numbers.
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Wiring of weighing strain gauge tension and compression sensors – we are in control
Strain gauge tension and compression load cells are available in two different input and output wiring methods:
The first is the four-wire connection method.
The load cell of the four-wire connection method has no special requirements for the secondary instrument panel, and it is very convenient to use, but when the cable is long, it is easy to be shaken by the operating temperature.
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Precautions for the use of safety barriers
First, pay attention to the capacitive and inductive resistance of cables and field equipment, explosion-proof is the system explosion-proof, in addition to the need for P+F safety barriers to reach the required explosion-proof level, the energy storage of cables and field equipment is also a key issue. Especially after the parametric certification replaces the system certification, the engineering company has a special ...
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