Impact detector

Table 1 Performance Characteristics of the Spray Impact Detector Mobile Phase, Boiled Distilled Water...

A chromatogram showing the separation of some fatty acids monitored with the spray impact detector is shown in figure 11. The high sensitivity is clearly indicated. This detector has not been developed commercially but remains an interesting detecting principle based on a well-established natural phenomenon. 

Piezoelectric devices are used in the following areas Measurement of pressure, measurement of vibrations, stress gauge, strain gauge, measurement of acceleration, impact detector, position sensors. There is a wide choice of materials and material forms that are actively piezoelectric. Most of them have the ability to convert mechanical strain into an electrical charge when used as sensor, and to do the opposite when used as an actuator. Studies of piezoelectric semiconductors, nonlinear effects and surface waves led to constraction of useful devices. The research of sophisticated electroacoustic devices may one day simplify the dialogue between the user and the computer. There are matty more examples of this kind one coirld mention. 

Piezo film acts as an impact detector when it is compressed between two plates. Attaching the film s output to an audio amplifier yields the sound of impacts made on the top plate or the resting surface. The response is the same, whether the top plate is heavily loaded or not. The point is that film response is independent of static pressure, because it responds only to pressure changes. 

PERFORMANCE CHARACTERISTICS OF THE SPRAY IMPACT DETECTOR MOBILE PHASE. BOILED DISTILLED WATER... 

Figure 36. Chromatogram from the spray impact detector. Separation of the n-Cg, Cg, and Cjo fatty acids. Column 60 x 0.6 cm pBondapak Cig/Corasil target, gold mobile phase, boiled distilled water at 5.9 ml/min air flow, 4550 ml/min. A, injection point B, inorganic impurities C, 7.2 ng octanoic acid D, 120 ng nonanoic acid E, 80 ng decanoic acid.

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