OPTEL-TEXYS fibre-optic tachometers enable speed measurement with an accuracy that sets the industry standard in this field. Whether the measuring distance is close to the sensor (1 to 20 mm) or much greater (> 200 mm), we can provide an optical solution with our 152G6 amplifier. With its bandwidth and power of emission, it can compete with laser-type products but without being dangerous for operators. An additional integrated or external lens allows detection at a distance over 300 mm on a highly reflective surface.
Acyclism is an inherent phenomenon in internal combustion engines where, a linear movement of several pistons will be transformed into a rotational movement of the crankshaft. The direct consequence is a change in angular velocity, angular position or angular acceleration.
Capturing these variations requires the detection of contrasting and regular periodic elements such as B&W patterns with optical probes offering the desired resolution. Based on speed variations measurement made with 152G7 amplifier, advanced signal analysis allows extraction of acyclisms on the motor’s accessories or the study of drive belt slip.
Fluctuations in instantaneous speed cause pulsating phenomena on rotating machines, known as torsional vibrations. They are present on alternating machines (diesel engines, pumps, compressors), propellers (wind turbines, fans), electrical machines (alternators, generators, motors) and their transmissions. They can lead to problems of fatigue, loss of power, noise and vibration.
The 152 series sensors in combination with the YO, SLIT YO and FFO fibre optic probes capture a large number of pulses per revolution and deliver a stable time reference as a function of speed to perform torsional vibration analysis in the time and frequency domain. In addition, OPTEL-TEXYS offers proprietary encoder test patterns with periodic black and white elements for optimal detection contrast.
The balancing of turbines, compressors, pumps or any other turbomachinery is intended for technicians and engineers who encounter problems of vibration on their shaft lines and bearings. It is also of interest to those involved in power plants, chemical platforms or service centres for turbomachinery.
The use of the 152M or 152G8 sensors associated with the high resolution SLIT probes is a reliable and versatile solution, on whatever the rotating machine you will be carrying out tests. You can detect directly on any periodic rotating element, such as blades or propellers. The quality of the generated frequency signal provides a perfect reference for mass adjustment operations. The result is a substantial reduction in vibration and increased machine durability.
Among the systems on the market for measuring static and dynamic torque, there are certain limitations to their use, such as the mass added to the machine under test, slip ring transmission or telemetry, which can be disturbed by high angular or tangential speeds. OPEL-TEXYS' optical technology is a contactless and mass-free solution that can be adapted to a wide range of environments and machine types. Indeed, OPTEL-TEXYS offers standard optical probes with reduced dimensions and also customised probes with more or less complex geometries. Combined with the 152G7 or 152M sensors, they offer a robust and alternative solution that has already proven itself (see article "Torque sensor").
Tip-Timing or blade deformation measurement is applied to turbines and the use of fibre optic sensors provides a fast and reliable alternative to strain gauge instrumentation for measuring dynamic stresses on turbine blades.
In the Aerospace, Energy or Research Laboratory, 152M sensors accurately determine the passage of the blade at a particular location and do not, in some cases, require the use of multiple sensors.
The fiber optic sensors have the following advantages over other sensors used for this purpose: provision of a dual "TTL & Analogue" signal, insensitivity to electromagnetic interference, reduced weight and size, high sensitivity, resolution and bandwidth.
Detection & liquids
Detection with optical sensors in an environment where liquids are present can seem contradictory. However, OPTEL-TEXYS' decades of experience in the development of innovative optical systems has enabled it to find the technological solutions to detect rotating elements in liquids or oil mists.
OPTEL-TEXYS proposes to use 152G8 or 152M sensors whose high emission power will accommodate specific probes for detection when the part is immersed in a liquid. When it is necessary to detect through droplets, unlike a laser sensor, the infrared beam will not diffract in order to read the measurement steps on the rotating part in question.
Speed into ball-bearings
This particular application on bearings is designed to measure the speed of balls or rollers. In this case, the detection method implemented with OPTEL-TEXYS sensors is of the "through-beam" type.
Optical sensors called FFO are installed face to face with transmission on one side of the bearing and reception on the other. Thus, it is the alternating passage of the balls that will interrupt the beam and generate the speed frequency signal. This signal can be in the standard TTL format or in analogue form as proposed on the 152M sensor. The analysis of this analogue signal can lead to a more detailed understanding of the phenomena.