Sensors classifications

A more logical method for sensor classification is to first define the characteristics of each sensor and its targeted market. Using this approach. 

Some years ago, the engineering community addressed the topic of sensor classification—Richard M. White in IEEE Trans. Ultra., Ferro., Freq. Control (UFFC), UFFC-34 (1987) 124, and Wen H. Ko in IEEE/ EMBS Symposium Abstract T.1.1 84CH2068-5 (1984). It is interesting because the physical and chemical properties are given equal weight. There are many ideas given here that remain without embodiment. 

For gas sensor classification, various approaches can be used. For example, taking into accoimt transduction mechanisms, we can distinguish six general categories of sensors (1) optical sensors, (2) electrochemical sensors, (3) electrical sensors, (4) mass-sensitive sensors, (5) calorimetric sensors, and (6) magnetic sensors (see Table 1.11). 

We need to point out that our classification represents but one of the possible alternatives. Detection principles can also be used for gas sensor classification. According to detection principles, commonly used gas sensors can be classified into the following three groups (1) sensors based on reactivity of gas, (2) sensors based on physical properties of gas, and (3) sensors based on gas sorption (see Table 1.15). 

The paper describes the different chemical sensors and mathematical methods applied and presents the review of electronic tongue application for quantitative analysis (heavy metals and other impurities in river water, uranium in former mines, metal impurities in exhaust gases, ets) and for classification and taste determination of some beverages (coffee, bear, juice, wines), vegetable oil, milk, etc. [1]. 

In conclusion of this Section let us dwell on another important topic related to possible from our stand-point classification of sensors on crystal type of adsorbent. 

Given the intermediate labels from the GPC pattern and sensor interpreters, a KBS is used to map them into the diagnostic labels of interest. However, because the output dimension of the problem is large (at over 300 possible malfunctions), a hierarchical classification system is used to decompose the process into a hierarchical set of malfunction categories that... 

Figure 2. Classification of chemical sensors according to the operating principle of the receptor and transducer.

Hulanicki A., Glab S., Ingman F., Chemical sensors definitions and classification. Commission on General Aspects of Analytical Chemistry, Pure Appl. Chem. 1991 63 1247. 

Table 1. International classification of enzymes with examples of bioenzymatic sensors for each enzyme main class.13... 

Another classification is based on the analytes that occur in gas or liquid phases. The CL gas sensors are applied to the analysis of compounds in gases or vapors, such as 02, 03, NO, N02, chloride, ammonia-containing compounds... 

For each type of sensor, a classification framework sets precision tolerance ratings. Platinum temperature sensors have a positive temperature coefficient which is defined as ... 

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