Fiber-optic pins

Fiber-Optic Pins. In one version of the fiber-optic pin (Benjamin et al., 1984), a small microballoon, 0.25 mm in diameter, filled with a noble gas such as argon or xenon is attached to the end of an optical fiber. When the pin is impacted, the shock heats the gas in the microballoon producing a flash which is channeled to a recording system via optical fibers. Some of the useful features of this pin are... 

Photodiode (LED) Pin photodiode Cameras, strobes, illuminators, remote controls, IR sensors Fiber-optic communications, liber links... 

Fig. 10. Crack pinning by a SiC fiber in a glass matrix, photographed using an optical microscope and Nomarski contrast. Fiber ties perpendicular to plane of micrograph lines represent crack position at fixed intervals of time, crack mnning left to right.

The optical source is a diode laser and fiber-emitter and fiber-detector coupling is accomplished using standard optical fiber connectors. The detector is a PIN photodiode connected to a transimpedance preamplifier and the signal is amplified and filtered using a lock-in amplifier that also tunes the modulation frequency of the laser source. The analytical signal is collected and treated by a PC. 

For certain types of functional structures—especially for those to be used in information processing and storage—the interface between the nanoscopic world and the macroscopic world of pins, solder pads, and optical fibers may be as important as the nanostructures themselves. Understanding, in a particular case, if this problem of interfacing nanostructures with the macroscopic world can be solved by some application of conventional technology, or if it will require some new solution, is a key part of the problem. 

Lab-on-a-Chip Devices for Particle and Cell Separation, Fig. 1 PDMS-based optofluidic micro flow cytometer with two-color, multiangle fluorescence detection capability using PIN photodiodes. Optical fibers are... 

Si PIN photodiodes feature low capacitance, which enables them to deliver a wide bandwidth with only a low bias voltage, making them ideal for high-speed photometry as well as optical communications. Some PIN diodes have a mini-lens, which increases fiber coupling efficiency and enhanced sensitivity for violet laser detection. 

The transmitted output power from the sample is measured by a NIR photoelectric multiplier with a spectral response ranging from 300 nm to 1700 nm, which is cooled to -80°C, through an optical fiber cable. A Si pin-type photodiode is placed near the optical parametric oscillator to generate a trigger signal. The optical fiber cable is directly in contact with the sample. 

Figure 3.16 Microscopic images of (a) input beam on the fiber near-end faces and (b) output beam on Si PIN PD in optical link with glass MMF.

Figure 11.14. An experimental arrangement for aehieving the optical limiting effect using the self-phase modulation or self-focusing/self-defocusing effect. See chapter 12, however, for a fiber array limiting device that does not suffers from small field of view associated with this configuration involving pin-hole.

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