What is Electronic Nose?
Electronic Nose (eNose) is a device to discover and recognize smells / vapours, ie a machine Olof peripherally acting with a number of chemical sensors.
Otherwise, according to Gardner, and Bartlett, definition (1994) [3]:
“An electronic nose is an instrument that consists of a series of electronic sensors, chemicals, a portion of which specificity and an adequate system of identifying model, capable of detecting odors simple or complex”
The most common use at present for eNose is in the food and beverage industry. In addition, in this area, eNose can be used in other fields, such as petroleum, qualitative and quantitative analysis, explosive detection, classification and degradation of olive oils Study The development of an odor detector field of the environment for the application of quality control applications in the Automotive, discrimination between clean and polluted cows’ teats in a system of processes, analyses of raw materials cosmetics, as well as many other important areas, notably in the fields of medicine and aerospace.
The principle of eNose, it is necessary that a series of sensors, whether in the form of various types of polymers, or by the use of metal oxide semiconductor, the principle is always the same.
When a component molecules on the surface of the sensor, electrical conductivity, modifications, along with the expanded area. This is the basic idea, ie how eNose resistance of the probe, if the sensor is exposed to smells / vapours.
The model on the screen for each type of resistance is unique (ie the nature of the smell of steamed or template). In this way, it is possible, a sample or another country / state of the sample itself, as the head space of each sample has a unique signature on the eNose sensors resistance.
A little history
It is difficult to establish the date of the pin number “when and how” the idea of setting up a system of the imitation of the human nose. However, the following data with devices that provide a better understanding of how to design a machine peripherally acting Olof (MOD). The design MOD eventually led to the conceptualization of eNose.
Please note that eNose are distinguished from other types of MOD, simply by clicking with multiple sensors, while other products may have a sensor or simply the mechanism itself to differ materially from eNose fundamental principles.
The name of MOD, therefore cover equipment such as aircraft eNoses ie with several sensors, but also with the various aircraft sensors - or this type of material, based on a different design principles ).
The four are important data for the history and development of eNose:
1-1954
Constructing 2nd array of 6 1961
3rd First Electronic Nose, Persaud and Dodd, 1982
4th Ikegami (Hitachi Research Laboratory, J), table of the quality of smell - 1985
That is why the first attempt to use scientific matrix of sensors to emulate and understand mammals Olof action was carried out by Persaud and Dodd in 1982 [3], at the University of Manchester Institute of Science and Technology.
A breakthrough was created by a series of three metal oxide gas detectors used to discriminate between the twenty olfactory. Thanks to the visual comparison of the status of the sensor responses they get the model of the classification.
The name itself “electronic nose” for the first time 1988 and has been sharing “as a generic term for a range of chemical gas sensors embedded in a unit artificial Olof action” [3] [4], after the Implementation of these titles, a conference to Iceland in this area in 1991. From that moment, the idea and principles of the eNose has developed in several areas, and throughout the world.
Historically, there are two different types of eNoses (1997):
Statistics 1 smell of delivery charges.
2nd Mass Flow Systems.
Given that the two names suggest, the basic mechanism for the first, is that there is no flow of smell, but only a bottle containing the sensors with a fan at the head of distribution within the piston. Such was the theme of the first eNose in 1982.
The second type, which is very popular now where the smell of cash within the system. Most designs are eNoses in this way.
To conclude this brief historical overview of the eNose, it is a good idea to become familiar with the schematic as the basis of comparison between humans and electronic noses [6], summarized in the following two sections.
The Human Nose [6]
There are millions of receptors product itself (about 10 million euros) with a selectivity of classes ranging from 10 to 100
The human nose is very adaptable, but unlike the eNose, saturation can happen, and this is one reason why they work only for a short period. From the diversity of odors that can be identified, it can detect specific molecules more certain, but it can not recognize a number of other types of simple molecules.
As a biological system, the infection can be carried out, may affect the ability to smell.
And finally, can feel with a variety of experiences and memory.
The eNose [6]
Approximately 5 - 100 chemical sensors replace manually. Compared with the nose of the man, it is not possible to automatically reduce the number of signals on some.
Given that the eNose to continue to develop, it is possible in the future to be adaptive, it is also unlikely that saturated, and for a long period.
Although identifying model equipment, which are incorporated into the device, then the new real-time signal processing can occur. However, human consumption, nose, eNose must be filed for each application. It is possible to detect single molecules, but it can not detect certain complex molecules in a low concentration.
The eNose may be poisoned (faulty sensors), at the same time, it is possible that eNose multi-sensors are placed in relation to other functions and recognitions.
How eNose work?
A number of operating parameters are usually needed in order to provide the eNose to “a maximum effect. These parameters can be in the company:
1 Setting the temperature for the incubation period of the sample
2nd The sample size.
The share of the 3rd injection.
4th The amount of injection.
5th The value added solvent used.
6 The volume of electricity.
7 type sensor.
8 sensor operational parameters.
The above are only examples, but there could be other factors.
As we have briefly above, the principle of eNose is especially when one or more (a), vapor detectors (sensors). Typically, the detector consists of certain types of sensitive materials, the hallmark of behavioural change, or in response to absorbed or adsorbed molecules. How to measure changes in the various sensors, allows for the identification of unknown smell (s) by comparison with the library.
Conclusion
ENose devices have been developed in the past 20 years, a large number of identification missions in various industries. But only a few years, that the majority of the workforce and publishing as part of this area were mainly in the field of research. Nowadays, different types of eNoses commercially available can be purchased anywhere in the world.
The reason for the relatively rapid development and commercialization of these devices, as it has again attracted the interest of their implementation in the areas of food, the environment, medical diagnoses, ‘ Industry, security and other areas. The action is currently applicable. Otherwise, it may to a spectacular collapse of goodwill of the company and, in some cases, the companies themselves, for example, the manufacture of a computer without supervision. Suppose we have the elements for the manufacture of approximately five thousand computers. If the company obtains a contract for the manufacture of computers and fifteen thousand part in the mission, they do not recognize that they do not have adequate funds for the execution of the order until all the five thousand computers were manufactured. Although markets for the parties at that time, there would, in the place of effective until the parts arrive. Therefore, the control is very important to all forms of the economy, whether small or large. Business-An inventory software makes it easier to service, which is a record is held by a company.
There are different business systems available on the Internet for downloading. Two of them are MatrixNet, MyHome system ESInventory clothing and Victoria organizers. Let’s now a few of them in detail.
Golden Inventory System is designed for large companies, a large inventory, as a general rule, an ERP (Enterprise Resource Planning), a division of Multi-Warehouse. In this system, there are several functions. Distinct access rights that can be used with several types of personnel. The system works with MS-SQL Server and the database files. It may also be in the UNIX environment, not just Windows. The main features of the system Or are supported multiple users, a number of companies, several warehouses of a company, invoices, orders, bar code labels, bar code scanners, commands, ‘inventory, support for the designation of the authorisation process, suppliers and customers tracking payments, control measures, forecasting, quotes, reservations for the sale, shipping and receiving , Point-of-Sale, software and options regarding labour markets for the manufacture, transfer between camps, video and report authorizations of the user on the screen to adapt support, export reports in Excel files, etc.
The MyHome Inventory is an ideal system for home and office environments. It has several functions, as several places of storage, control, shipping and receiving, transfer between the two places, the report of the assistant adapting video, etc. It is ideal for the pursuit of property at home.
The ESInventory Universal is a monitoring tool that can be used anywhere, offices and housing in enterprises. It has functions are responsible for the creation of the post, monitoring, receiving, shipping and leasing operations.
The clothes Victoria organizer is a simple application that can be used to manage clothes. The result was the creation of functions, such as clothing, toys, which contribute to creating opportunities for games of clothing, the kind of objective, weather, temperature, etc. key to the user in all this information in the application and the software generates a series of clothing from inventory to be backed up for the occasion.