1. Intensity-modulated optical fiber sensor
It is a sensor that uses changes in the refractive index, absorption, or reflection of sensitive components caused by changes in the parameters of the measured object to achieve sensitive measurements. There are microbending losses using optical fibers; absorption characteristics of each substance; changes in the intensity of reflected light from the diaphragm or liquid crystal; The phenomenon that a substance emits light due to various particle rays or chemical and mechanical excitation; and fluorescence radiation of substances or blocking of optical paths to form various intensity modulated fiber optic sensors such as pressure, vibration, temperature, displacement, and gas.
Advantages: simple structure, easy to implement, low cost.
Disadvantages: It is greatly affected by the fluctuation of light source intensity and connector loss.
2. Polarization modulation optical fiber sensor
It is a sensor that uses the change of optical polarization state to transmit the information of the measured object. There are current and magnetic field sensors made by using the Faraday effect of light propagating in a magnetic field; Electric field and voltage sensors made by using the bubble effect of light propagating in the piezoelectric crystal in the electric field; pressure, vibration, or sound sensors that use the photoelastic effect of matter; and birefringence using optical fibers to form temperature sensors, pressure sensors, vibration sensors, etc.
Advantages: It can avoid the influence of changes in the intensity of the light source, so it is highly sensitive.
Cons: Not easy to implement
3. Frequency modulated fiber optic sensor
It is a sensor that monitors the change in the frequency of the light reflected back from monochromatic light on the measured object. There are fiber optic velocity, flow rate, vibration, pressure, and acceleration sensors that use the Doppler effect of reflected and scattered light from moving objects; Gas sensors that measure gas concentrations or monitor atmospheric pollution using Raman scattering when a substance is exposed to strong light; and temperature sensors that utilize photoluminescence.
Advantages: easy to implement, low cost
Disadvantages: Low sensitivity
4. Phase modulation sensor
The basic principle is to use the effect of the measured object on the sensitive element to change the refractive index or propagation constant of the sensitive element, resulting in the phase change of the light, so that the interference fringes produced by the two monochromatic lights change, and the phase change of the light is determined by detecting the change of the interference fringes, so as to obtain the information of the measured object. There are often sound, pressure, or vibration sensors that utilize the photoelastic effect; current and magnetic field sensors that use the magnetostrictive effect; Electric field and voltage sensors that use electrostriction, and rotational angular rate sensors (fiber optic gyroscopes) that use the Sagnac effect of fiber optic fibers, etc. This type of sensor has a high sensitivity. However, due to the need for special optical fibers and high-precision inspection systems, the cost is high.
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Banner Sensors – Troubleshooting solutions for pressure sensors
(1) Measurement of absolute air pressure by electronic means makes the control of the inflatable state of the line more complete and continuous.
(2) From the dynamic and static aspects, the air leakage point can be estimated in advance.
(3) Determine the change in time of the pressure inside the cable, so that the inflatable ...
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Banner Sensors – Routine maintenance methods for pressure sensors
1. Prevent the debris from being deposited in the catheter and the sensor from coming into contact with corrosive or overheated media.
2. When measuring gas pressure, the pressure intake should be opened at the top of the process pipeline, and the sensor should also be installed in the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process pipeline.
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Banner Sensors – Mounting issues with pressure sensors
1. Correct installation method of pressure sensor:
(1) Verify the frequency response value of the pressure sensor under normal atmospheric pressure and standard temperature conditions with appropriate instruments.
(2) Verify the correctness of the code of the pressure sensor and the corresponding frequency response signal.
2. ...
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Banner Sensors – A method for processing signals from photoelectric sensors
1. Acquisition, processing and transmission of detection signals;
2. Signal filtering technology is used to remove noise;
3. Use relevant technologies for signal analysis and data processing of the results;
4. Choose the most suitable amplification technology to improve the signal strength according to the actual situation;
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What problems do Banner laser distance sensors have that need to be solved?
(1) When the target to be measured is not perpendicular to the transducer of the sensor. This is because the target of the ultrasonic test must be within an angle of no more than 10° perpendicular to the sensor.
(2) When a small beam diameter is required. Because the diameter of the general ultrasonic beam is ...
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Banner Sensors – What are the Uses of Photoelectric Sensors?
1. Photoelectric smoke alarm
When there is no smoke, the light emitted by the light-emitting diode travels in a straight line, and the phototriode does not receive a signal. There is no output, when there is smoke, the light emitted by the LED is refracted by the smoke particles, so that the transistor receives the light, there is a signal output, ...
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Banner Sensor - Introduction to the function of the color sensor
1. Color recognition function
2. Color recognition function independent of working distance
3. It can also provide reliable detection of vibrating objects
4. White LED
5. Dynamic, remote control teaching function
6. Trigger input
7.3 color channels, 5 levels of threshold
8. May ...
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How to maintain Banner sensors after use
1. It is necessary to prevent the sensor from engaging with corrosive gases, preventing it from corroding and affecting the effectiveness of measurement.
2. Assuming that the measurement is a high-temperature medium, it is necessary to see whether the temperature is within the appropriate temperature scale of the sensor.
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Banner Sensor - What are the applications of fiber optic sensor technology?
1. Fiber optic gyroscope
Fiber optic gyroscopes can be divided into interference type, resonant type and Brillouin type according to the principle, which is the representative of the three generations of fiber optic gyroscopes. The first generation of interferometric fiber optic gyroscopes, which is now mature and suitable for mass production and commercialization; The second generation of resonant fiber optic gyroscopes, ...
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Banner Sensors - Introduction to the characteristics of distributed fiber optic sensors
(1) The sensing element in the distributed optical fiber sensing system is only optical fiber;
(2) The one-dimensional distribution map of the measured optical fiber area can be obtained in one measurement, and the two-dimensional and three-dimensional distribution of the measured can be measured by erecting the optical fiber into a grating-like shape;
(3) The space of the OTDR system ...
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Banner Sensor - How and how to select a proximity sensor
A proximity sensor is a device with the ability to perceive the proximity of an object, which uses the sensitivity of the displacement sensor to the approaching object to identify the proximity of the object and output the corresponding switching signal. For this reason, proximity sensors are often referred to as proximity switches. It is an alternative to contact detection ...
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Banner Sensors - Introduction to the applications and characteristics of various types of sensors
1. Resistive type
A resistive sensor is a device that converts measured physical quantities such as displacement, deformation, force, acceleration, humidity, temperature, etc. into resistance values. There are mainly resistive strain, piezoresistive, thermal resistance, thermal, gas-sensitive, moisture-sensitive and other resistive sensing.
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Features of Banner laser distance sensors
(1) The Ultimate Problem Solver: Solve the most challenging applications by reducing sensor inventory with reliable, durable sensors
(2) Regardless of the reflectivity of the target surface, the solution is difficult distance-based applications, including black foam on black plastic, black rubber in front of metal, multi-packing, etc.
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Banner Sensor - The working principle and selection of laser distance sensors
How laser sensors work
In the industrial field, the most common laser sensor is the laser displacement sensor, also known as the laser distance sensor, which can accurately measure the position, displacement and other changes of the measured object without contact, and is mainly used to detect the displacement, thickness, vibration, distance of the object.
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What are the application areas of Banner pressure sensors?
Everyone is familiar with the brand Banner, what are the fields of sensor applications under Banner? Today, we will introduce the application fields of Banner sensors, which are mainly used in: booster cylinders, boosters, gas-hydraulic booster cylinders, gas-liquid boosters, presses, compressors, air conditioning and refrigeration equipment, etc.
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Banner Sensors – A way to test the quality of pressure sensors
First, the test method of pressure sensor
The test on pressure sensors mainly includes the following aspects:
Resistance test
Output signal test
Overload test
1. Resistance test
The test machines are as follows: power supply, multimeter, ammeter, ...
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Banner Sensor - The appearance of a fiber optic sensor
The appearance of a fiber optic sensor is basically made up of the following parts, from left to right:
(1) SET key, which can be used for sensitivity setting. The basic principle of the sensor is to sense the refractive index of different media through an optical fiber probe to obtain a digital signal, which is displayed on the screen.
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Banner Sensor - Common fault phenomena and judgment methods of fiber optic sensors
1. There is no display on the digital display after connecting the power supply
(1) Check whether the power cord is broken and whether the plug contact is good.
(2) Whether the power fuse of the digital display meter is blown.
(3) Whether the power supply voltage meets the requirements.
2. The digital display table does not count
(1) Passing ...
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A brief analysis of the static characteristics of the sensor
The static characteristics of a sensor refer to the performance of the sensor in a static state, which is an important indicator to measure the sensor. The static characteristics of a sensor include linearity, repeatability, hysteresis, accuracy, sensitivity, threshold and resolution, drift, and more.
1. Linearity refers to the sensor measurement ...
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Installation steps for Banner safety light curtains
1. Determine the installation location. Like injection molding machines, hydraulic presses, etc., are generally installed on the front 2 sides, and some non-standard equipment should be determined according to the actual situation to determine the installation position, to achieve the role of protection, without hindering the normal work.
2. Punching. Determine the installation location ...
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