Noise characteristics

So, a comparison of different types of magnetic field sensors is possible by using the impulse response function. High amplitude and small width of this bell-formed function represent a high local resolution and a high signal-to-noise-characteristic of a sensor system. On the other hand the impulse response can be used for calculation of an unknown output. In a next step it will be shown a solution of an inverse eddy-current testing problem. 

Gadolinium ethyl sulfate has extremely low noise characteristics and may find use in duplicating the performance of amplifiers, such as the maser. 

This attribute of rapid accumulation of spectra leads to excellent reproducibility and better signal-to-noise characteristics, and it makes full use of small quantities of sample. 

VENTILATION NOISE—CHARACTERISTICS, EFFECTS, AND SUGGESTED COUNTER-MEASURES 345... 

FIGURE 10.26 Noise characteristics for experimental LVHV exhaust nozzles,... 

The applied potential affects not only the sensitivity and signal-to-noise characteristics but also die selectivity of amperometric measurements. In general, a lower potential is more selective, and a higher one more universal. Thus, compounds undergoing redox potentials at lower potentials can be detected with greater selectivity. The selection of die applied potential relies on the construction of... 

A systematic analysis of a process signal over (1) different segments of its time record and (2) various ranges of frequency (or scale) can provide a local (in time) and multiscale hierarchical description of the signal. Such description is needed if an intelligent computer-aided tool is to be con--structed in order to (1) localize in time the step and spike from the equipment faults (Fig. 1), or the onset of change in sensor noise characteristics, and (2) extract the slow drift and the periodic load disturbance. 

The concepts and basic approach used in studies of electrical fluctuations in corrosion processes proved to be very successful as well in mechanistic studies of electrode reactions taking place at materials covered by passivating films. A typical example is the electrochemical dissolution of silicon. From an analysis of the noise characteristics of this process, it has been possible to identify many features as well as the conductivity of the nanostructures of porous silicon being formed on the original silicon surface. 

Chapter 40 is based on reference [1], In this chapter we brought up the question of how various types of noise are related to the noise characteristics of the spectra one observes. In this chapter, and in the thirteen subsequent chapters (41 through 53), we will derive the expressions for the various situations that arise these situations have been described in greater detail within Chapter 40. 

Here again, our task is simplified by the two facts we have mentioned above first, that we can reuse many of the results we obtained previously for the case of Normally distributed noise, and second, that the nature of uniformly distributed noise characteristics simplify the mathematical analysis. Our first step in this analysis starts with equation 44-71, that we derived previously in Chapter 44 referenced as [5] as a general description of noise behavior ... 

Tossing a mental coin, the decision was to analyze the case of noise proportional to the square root of the signal. This, as you will recall, is Poisson-distributed noise, characteristic of the noise encountered when the limiting noise source is the shot noise that occurs when individual photons are detected and represent the ultimate sensitivity of the measurement. This is a situation that is fairly commonly encountered, since it occurs, as mentioned previously, in UV-Vis instrumentation as well as in X-ray and gamma-ray measurements. This noise source may also enter into readings made in mass spectrometers, if the detection method includes counting individual ions. We have, in... 

Table 52-4 Comparisons between noise characteristics, including the expressions for low-noise behavior...

Providing that hid remains constant, the RF coil sensitivity is inversely proportional to the coil diameter for solenoidal coils of diameter greater than about 100 p,m. It can be shown theoretically and has been demonstrated experimentally that the sensitivity of a solenoidal coil is about three times that of a saddle coil of the same size [3], In order to translate the coil sensitivity into measurement of SIN defined by Equation 7.6, we also have to consider the noise characteristics of NMR microcoils. For coils of diameter less than 3 mm, the major noise source is from the resistance of the coil itself, and the noise from even lossy biological samples can be neglected [10]. 

A device described by Sawyer and Dixon [13] was used for the determination of alcohol and acid in beer and stout. Attempts to improve the reliability of this method and to improve the signaTto-noise characteristics of the measurements prompted a critical design described by Lidzey et al. [14]. This unit overcomes many of the fluctuations in results observed with use of the first unit in this a number of possible sources of surging were indicated and these were not controlled owing to the varying conditions in the coil. In addition, the separation of the waste involatile material from the volatile phase took place outside the heated flask distillation unit. Air bubbles present in the segmented stream were also responsible for considerable surging. 

As expected. Equations 3 and 4 convey the same message as did Equations 1 and 2 and have improved t-ratios on term coefficients they are less confounded by the noise characteristic of the full datasets and are thereby more suitable for predictive work. 

Fig. 15.9. Noise characteristics of the AFM. The optical beam deflection method is applied. (Reproduced from Meyer and Amer, 1990, with permission.)...

KirkbrightjG. F. Sample introduction, signal generation and noise characteristics for argon inductively-coupled plasma optical emission spectroscopy in Instrumentelle Multielement-analyse (ed.) Sansoni, B., Weinheim, VCH 1985... 

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