Sensitivity characteristics

It is applied along with traditional methods to test strength properties, hardness, to determine standardized characteristics of stamping, grain size and other structural-sensitive characteristics. 

Some Paraplex resin mixts, such as Paraplex P-10 containing Paraplex resin AP-31 and styrene, are used by the Aerojet Engrg Corp, Azusa, Calif as an ingredient of JATO pro pints (see below). The same resin has been used as a constituent of resin-bonded expls (also, see below), while still other Paraplex resins are used to fabricate ceramic-faced composite armor (Ref 4) Refs 1) L.H, Eriksen, Study Stability and Sensitivity Characteristics of Paraplex Propellant ,PATR 1629 (1946) 2) E.T, Benning,... 

An interesting feature of LPGs is that their sensitivity characteristics to a specific parameter depend drastically on the order of the coupled cladding mode and on the type of the fiber in which they are inscribed. This makes possible to discriminate between different types of perturbation that act simultaneously on the grating and offers the flexibility to design devices that are very sensitive or insensitive to a particular measurand5 1. 

For the purpose of achieving a full understanding of the mode transition phenomenon, other sPS overlays with different thicknesses have been successively deposited on the same LPG. Each deposition was followed by the SRI characterization of the coated device. The experimental results, presented in the next section, have been analyzed to obtain the sensitivity characteristics of the HRI-coated LPG. 

In this section, the sensitivity characteristics of HRI-coated LPGs have been investigated to outline their dependence on the overlay thickness and mode order. In addition, the experimental results here presented provide the basic design criteria for the development of highly sensitive in fiber refractometers and chemical sensors for specific SRI ranges. 

The mechanism that induces such a change in the resonance wavelength behavior is the transition of the lowest order cladding mode into an overlay guided mode and the consequent mode redistribution. Here, the attention is focused on the analysis of the transition curves to determine the novel sensitivity characteristics of HRI-coated LPGs and to outline the dominant role of the overlay thickness and the mode order. 

Fig. 3.21 SRI Sensitivity characteristics in 140 nm coated LPG for different cladding modes...

Once modeled the transition curves, it is possible to retrieve an analytical form for the sensitivity characteristics in nano-sized coated LPGs. By using the SRI-derivative of the resonance wavelengths, the SRI sensitivity can be expressed as ... 

As can be inferred by the results obtained, the effect of nano-sized HRI coatings on LPGs is a drastic modification of their sensitivity characteristics, which ranges... 

In this regard, Fig. 3.22 shows the sensitivity characteristics of the LPos cladding mode for three different values of the coating thickness 140, 180, and 215 nm. The fitting parameters are reported in Table 3.2. 

Fig. 3.22 Sensitivity characteristics of the mode LPos for different overlay thickness values...

It is worth noting that, although the maximum sensitivity decreases for thicker overlays, the sensitivity gain with respect to the bare device increases. In fact, the sensitivity gain functions are obtained as the ratio between the sensitivity characteristics of coated and bare LPGs. They are reported for different mode orders and overlay thickness values in Fig. 3.23. 

Shu, X. Zhang, L. Bennion, L, Sensitivity characteristics of long period fiber gratings, J. Lightwave Technol. 2002, 20, 255... 

Cusano, A. Iadicicco, A. Pilla, P. Cutolo, A. Giordano, M. Campopiano, S., Sensitivity characteristics in nanosized coated long period gratings, Appl. Phys. Lett. 2006, 89, 201116... 

Pilla, P. Giordano, M. Korwin Pawlowski, M. L. Bock, W. J. Cusano, A., Sensitivity characteristics tuning in tapered long period gratings by nanocoatings, IEEE Photon. Technol. Lett. 2007, 19, 1517 1519... 

Survey of Sensitivity Characteristics of Typical Delay Ignitor Flash and Signal-Type Pyrotechnic Compounds Joseph Kristal and Seymour M. Kaye Picatinny Arsenal, Dover New Jersey 439383 111... 

For long-term heat ageing, property retention depends on the property and grades considered, notably the heat stabilizers used. For a heat-sensitive characteristic such as elongation at break, the values for a given polyethylene after ageing at 120°C are roughly ... 

For long-term heat ageing, property retention depends on the property considered. Impact strength and elongation at break are especially heat-sensitive characteristics. 

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