Tag: Fiber Optic Sensor

Introduction to Fiber Optic Sensor

by http://www.fiber-mart.com

In recent years, fiber optic sensor has been deployed successfully in the supervision of structures. Because it is immune to electromagnetic interference and can handle extreme conditions, so it is gaining popularity as the sensor of choice for many industries. Fiber optic sensor is a sensing device that converts light rays into electronic signals. It is usually used for measuring physical quantities such as temperature, pressure, strain, voltages and acceleration etc. This blog is to introduce fiber optic sensor’s classification, characteristics and applications.
Classification
Fiber optic sensor can be mainly classified by sensing location, operating principle and applications. Depending on location of sensor, there are intrinsic and extrinsic fiber optic sensors. Considering the operating principle and demodulation technique, fiber optic sensors can be further divided into intensity, phase, frequency and polarization sensors. Based on application, fiber optic sensors can be classified in physical, chemical, bio-chemical sensors.
Characteristics
Fiber optic sensor offers unique characteristics that make it very popular and sometimes become the only viable sensing solution. Some inherent characteristics of fiber optic sensor are shown as following:
Harsh environment stability to strong electromagnetic interference immunity, high temperature and chemical corrosion, as well as high pressure and high voltage etc.
Very small size, passive and low power.
Excellent performance such as high sensitivity and wide bandwidth.
Long distance operation.
High sensitivity.
Multiplexed or distributed measurements – which are used to offset their major disadvantages of high cost and end-user unfamiliarity.
Applications
Fiber optic sensor has a variety of applications that can be found in equipment from computers to motion detectors. Several applications are specifically shown as following:
Mechanical Measurement – such as rotation,acceleration, electric and magnetic field measurement, temperature, pressure, acoustics,vibration, linear and angular position, strain, humidity, viscosity etc.
Electrical & Magnetic Measurements
Chemical & Biological Sensing
Monitoring the physical health of structures in real time.
Buildings and Bridges – concrete monitoring during setting, crack monitoring, spatial displacement measurement, neutral axis evolution, long-term deformation monitoring, concrete-steel interaction and post-seismic damage evaluation.
Tunnels – multipoint optical extensometers, convergence monitoring, shotcrete vaults evaluation, and joints monitoring damage detection.
Dams – foundation monitoring, joint expansion monitoring, spatial displacement measurement, leakage monitoring, and distributed temperature monitoring.
Heritage structures – displacement monitoring, crack opening analysis, post-seismic damage evaluation, restoration monitoring, and old-new interaction.
Detection of Leakage

FIBER OPTIC COLLIMATORS

Fiber collimator is an effective passive optical component used for laser beam collimating. and Fiber optic collimators come in many forms.

Fiber collimator is an effective passive optical component used for laser beam collimating. and Fiber optic collimators come in many forms.

There are more things to consider  when it comes to purchasing collimators .

  • LENS TYPE
  • SIZE DOES MATTER
  • SPHERICAL OR CHROMATIC ABERRATION
  • SINGLEMODE OR MULTIMODE
  • PAIRING, TARGETING, OR LASER PIGTAILING
  • 0 DEGREE OR 8 DEGREE
  • ALTERNATIVES

 

Introduction to Fiber Collimator

Fiber Optic Collimators are devices used to expand and collimate the output light at the fiber end, or to couple light beams between two fibers. They are a module that combine a fiber and a lens, and has a function that produces parallel beams. We offer a range of fixed and adjustable fiber optic collimation packages for collimating a laser beam from the end of an FC/APC, FC/PC, or SMA connectorized fiber while maintaining diffraction-limited performance at the design wavelength.  They are available with different wavelengths (850 nm, 980 nm, 1060 nm, 1310 nm, 1550 nm) or fiber options (SM fiber, MM fiber, PM fiber, and LMA fiber, etc).

A fiber collimator is a device that narrows a beam of particles or waves. It can either cause the directions of light to become more aligned in a specific direction, or cause the spatial cross section of the beam to become smaller. Usually, fiber collimator is required to naturally transform diverging lights from an optical fiber to a parallel beam of light. It consists a single-mode or multimode fiber pigtail and a collimating lens. Collimator can also be used to calibrate other optical devices to check if all elements are aligned on the optical axis.

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Characteristics

  • Low Insertion Loss and Return Loss
  • Low Back Reflection
  • High Extinction Ratio
  • Low Insertion Loss
  • Wide Operating Wavelength and Temperature
  • Scientific design with serious processing art


Applications

  • Optical cable jumper or pigtail cable
  • Laser Beam Collimating
  • Optical cable jumper or pigtail cable
  • PM Isolator and PW WDM
  • Laser Beam Collimating

 

How Does It Work?

When placing the fiber end on the collimator lens, the light will be aligned to a parallel direction. Then through a slight adjustment of fiber end position, the working distance is obtained. The working distance of fiber collimator is related to the distance between fiber end and lens. According to the actual demands, we can determine the parameters of fiber collimator, such as distance between fiber end and lens, beam radius, accuracy, to achieve better performance.

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Conclusion

Selecting the right type of fiber collimator is essential to the performance of network, you should consider your project requirements as important factors. Fiber-MART offer a range of fixed and adjustable fiber optic collimation packages for collimating a laser beam from the end of an FC/APC, FC/PC, or SMA connectorized fiber while maintaining diffraction-limited performance at the design wavelength. For more information, welcome to visit www.fiber-mart.com or contact me by E-mail: service@fiber-mart.com