With all the advanced engineering that goes into the Chevy Volt range-enhanced electric vehicle, it's fitting to realize that without suppliers capable of putting leading-edge technology into production at a reasonable cost, commercial viability of the car would be impossible.

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MTLW-103-08-G-D-110

来源:LM317 Electronics Components编辑:Foxconn OE Technologies时间:2021-06-14 05:14:09

With all the advanced engineering that goes into the Chevy Volt range-enhanced electric vehicle, it's fitting to realize that without suppliers capable of putting leading-edge technology into production at a reasonable cost, commercial viability of the car would be impossible.

 

FIGURE 6.26

MTLW-103-08-G-D-110

A surveillance system has been developed for the centralized inspection of all critical components of the Airbus commercial jetliner during its lifetime. This fiber nervous system is designed for in-flight monitoring and currently is accessible to flight and maintenance personnel.

An optical-fiber mesh has been tested for a damage assessment system for a GFRP sub- marine sonar dome. Two sets of orthogonally oriented fibers are nested in the laminate during the fabrication process. When the fibers of the mesh are properly connected to LEDs and the detectors, the system can be configured to visualize the location of a damaged area.

As an alternative, a video camera and image processing are applied to determine the position of the damaged area. The fiber end faces at the detection side of the mesh are bundled and imaged into the camera tube. Two images are subtracted: the initial image before the occurrence of damage and the subsequent image. If fibers are broken, their location is highlighted as a result of this image subtraction.

MTLW-103-08-G-D-110

CONTROL OF INPUT/OUTPUT SPEED OF CONTINUOUS WEB FABRICATION USING LASER DOPPLER VELOCITY SENSOR

A laser Doppler velocimeter (LDV) can be configured to measure any desired component velocity, perpendicular or parallel to the direction of the optical axis. An LDV system has been constructed with a semiconductor laser and optical fibers and couplers to conduct the optical power. Frequency modulation of the semiconductor laser (or, alternatively, an external fiber-optic frequency modulator) is used to introduce an offset frequency. Some commercial laser Doppler velocimeters are available with optical-fiber leads and small sensing heads. However, these commercial systems still use bulk optical components such as acoustooptic modulators or rotating gratings to introduce the offset frequency.

MTLW-103-08-G-D-110

With an LDV system, the velocity can be measured with high precision in a short period of time. This means that the method can be applied for real-time measurements to monitor and control the velocity of objects as well as measure their vibration. Because the laser light can be focused to a very small spot, the velocity of very small objects can be measured, or if scanning techniques are applied, high spatial resolution can be achieved. This method is used for various applications in manufacturing, medicine, and research. The demands on system performance with respect to sensitivity, measuring range, and temporal resolution are different for each of these applications.

In manufacturing processes, for example, LDV systems are used to control continuous roll milling of metal (Fig. 6.27), to control the rolling speed of paper and films, and to monitor fluid velocity and turbulence in mixing processes. Another industrial application is vibration.

The steady-state phase error is

The steady-state phase-error is zero, as expected, since the loop-filter has a pole at D.C.

The transient response is determined by summing the residues of Øe (s )

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