Why use fiber optic sensors to measure physical quantities

Optical fiber sensing provides measurement solutions for places where electrical circuits and Electronic circuits cannot work. The work of fiber optic sensors is entirely based on photons, which are commonly referred to as light. From a physical point of view, photons have no mass, photons do not interfere with electrons, and photons only interfere with other photons under certain conditions. Therefore, even in the environment of high electromagnetic field, high magnetic field, high radiation field and extreme temperature, the behavior of photons can be predicted and controlled.

Optical fiber sensing provides measurement solutions for places where electrical circuits and electronic circuits cannot work. The work of fiber optic sensors is entirely based on photons, which are commonly referred to as light. From a physical point of view, photons have no mass, photons do not interfere with electrons, and photons only interfere with other photons under certain conditions. Therefore, even in the environment of high electromagnetic field, high magnetic field, high radiation field and extreme temperature, the behavior of photons can be predicted and controlled.

Why use fiber optic sensors to measure physical quantities

With the advent of optical fibers, the scientific community has learned to guide light for long-distance transmission with minimal loss or interference in a small piece of glass. Without fiber, the Internet as we know it would not exist. An incredible amount of information is spread all over the world via fiber optic networks.

Obviously, photons can only use light to perceive physical quantities. Many fiber optic innovations from the communications industry can be directly applied to fiber optic sensing. Some of the earliest fiber optic sensors were fiber optic rotation sensors (gyros) that were described and demonstrated in the 1970s. Fiber optic gyroscope is a mature product with extremely high accuracy and reliability. It is mainly used in high-end navigation systems and guidance systems for geophysical drilling equipment. Optical fiber acoustic sensors based on optical interference are very sensitive. They can capture small changes in pressure waves and detect sounds from incredible distances-complex sonar applications are their main application. Temperature, strain, position, speed, angle, vibration and sound sensors have all been realized and put into commercial use. Of course, most other physical quantities can be sensed and measured with light. However, not all possibilities have been explored or exploited.

By definition, fiber optic sensors are completely controlled by light and do not include any electronic components. Generally, the optical fiber sensor uses a certain amount of light to “interrogate”, and the sensor will change the characteristics of the interrogation light signal according to the measured physical quantity. The interrogator converts the received optical signal into an electronic quantity in analog or digital form and serves as an interface for additional control equipment.

Although optical fiber communication is widely used in industrial networks, the sensors connected to these networks are usually traditional electronic sensors that measure temperature, pressure, flow, position, speed, etc. Although today’s electronic products are powerful, diverse and intricate, they still have limitations. The temperature range is limited to approximately -65°C to +125°C. Electronic sensors cannot work reliably under high electromagnetic, magnetic fields or radiation (x-rays). Electronic sensors are susceptible to high-voltage fields such as lightning strikes or high-voltage transmission lines. Long electrical chains are susceptible to interference and ground loops, which affect sensitive sensor signals. The above-mentioned problem does not exist in the optical fiber line.

FISO correctly identified the sensing needs outside the electronic field, began to develop the first optical fiber encoder, and soon launched the product. It senses the movement of cable trams in mountainous areas and is immune to lightning, which eliminates power outages, improves reliability, and saves time and costs. Since then, we have added many features to support our customers in an effort to overcome the limitations of traditional electronic-based sensors.

Fiber optic sensors not only have advantages over electronic sensors, but also enable new technologies to emerge. The sensor can be deployed together with the patient in the MRI borehole. The sensor is not only immune to extreme magnetic fields, but also transparent and invisible during imaging. This has led to new developments, robots integrated in MRI holes. Other implementations include phantom organs for the development of MRI software algorithms. For example, an artificial heart uses pneumatic power to move the heart muscle, and fiber optic sensors monitor the correct movement of the artificial muscle.

Obviously, fiber optic sensors are not meant to replace electronic sensors. On the contrary, they enhance automation and measurement systems, allowing solutions that cannot be achieved without fiber optic capabilities, or are troublesome to implement. Fiber optic sensors are the enablers of new technologies.

Why use fiber optic sensors to measure physical quantities

Next, we will recommend fiber optic sensors corresponding to the fields of temperature, pressure, refractive index and strain. The high-quality fiber optic temperature sensors imported by the company from abroad-FOT-L-BA and fiber optic temperature sensors-FOT-L-SD, FOT -L-SD and FOT-L-BA are optical fiber temperature sensors that are very suitable for measuring temperature in extreme environments, such as low temperature, nuclear environment, microwave and high-intensity RF. FOT-L combines all the excellent characteristics you expect from an ideal sensor body. Therefore, even in extreme temperatures and unfavorable environments, this type of sensor can still provide high-precision and reliable temperature measurement. The main features of the two FOT-L temperature sensors are that they are completely immune to EMI and RFI. At the same time, they are small in size, have built-in safety devices for hazardous environments, are resistant to high temperatures, corrosion, and have high accuracy.

Why use fiber optic sensors to measure physical quantities

Optical fiber pressure sensor-FOP-M260, FOP-M260 optical fiber pressure sensor is a small volume, high-precision sensor designed for the medical field. Completely anti-electromagnetic interference and completely intrinsically safe to the human body. It is widely used in cardiovascular, gastroenterology, pharmacology and other medical fields.

Why use fiber optic sensors to measure physical quantities

Fiber optic refractive index sensor-FRI, FRI is a fiber optic refractive index sensor. This type of sensor is an ideal product for measuring the refractive index of fluids in industrial, chemical and food processing. They are also often used to measure the oil concentration ratio. For engineers in the instrument industry, this field-proven solution is undoubtedly a valuable asset. As a small sensor, FRI can provide online refractive index measurement, and use it to continuously monitor any process, whether it is an industrial process or a chemical process in food engineering. This eliminates manual sampling and measurement consistency. problem. In addition, the FRI sensor can also work normally under different temperature, EMI and other changing conditions.

Why use fiber optic sensors to measure physical quantities

Optical fiber strain sensor-SFO-W, SFO-W is a kind of optical fiber spot welding strain sensor, mainly for civil engineering applications, such as monitoring of dams, bridges, tunnels and other structures. SFO-W fiber optic strain sensor has the characteristics of small size, high precision, immunity to EMI/RFI interference, corrosion resistance and high temperature resistance. This sensor is mainly based on a unique optical fiber strain sensor technology that breaks through optical fiber sensing. The extrinsic Fabry-Perot strain sensor is embedded inside the steel pipe, so it can monitor the tension or compression movement of the spot welding sensor.

The Links:   AT080TN52-V1 CM100DY-34A

Author: Yoyokuo