Application of sensor technology in detection field

Date：2022-06-22 17:44:36Views：716

The sensor is a kind of detection device, which can feel the measured information, and can transform the detected information into electrical signals or other required forms of information output according to a certain law, so as to meet the requirements of information transmission, processing, storage, display, recording and control. It is the first step to realize automatic detection and automatic control. Sensor technology has developed rapidly in recent years. Sensor technology is needed in all major fields of life. Sensor technology is mainly used in detection and provides great convenience for detection. This paper introduces the role of sensor technology in medical detection, food analysis and environmental detection, to explore more secrets of sensor technology.

1. Laboratory Medicine

With the development of science and technology, computer technology, electronic technology and digital signal processing technology have been continuously developed, which has promoted the rapid development of related science and technology, and the development of medicine is inseparable from them. For example, the development of CT, B-ultrasound, color ultrasound, nuclear magnetic resonance and so on, which are commonly used in hospitals, cannot be separated from sensor technology. Among them, biosensors are commonly used in medical technology. The substances that can be detected by biosensors include bacteria, viruses, acetic acid, urea, glutamic acid, lactose, lactic acid, uric acid, and antibiotics. These substances have an impact on human health and can nourish cancer cells in the body. In addition, biosensors can also detect the interaction between macromolecules and the hybridization reaction between samples.

2. Food analysis and detection

In the field of food analysis and detection, the sensor has the advantages of fast analysis speed, high accuracy and low price, and can detect substances that were difficult to detect in the past. The most attractive advantage is that it can be detected online, which has made a significant contribution to the analysis of food components and the prediction of food preservation period, making the relevant work of the health inspection department more convenient and accurate. Nowadays, the sensor can accurately detect proteins, organic acids, amino acids, as well as some food additives, mineral elements, alcohols, etc. in the field of food detection. In addition, it can also be used to determine the freshness of food and the microorganisms and various harmful substances contained in food to ensure food safety.

3. Environmental testing

If we want to achieve sustainable development, we must immediately implement the action of environmental protection, which is urgent. Before dealing with environmental pollution problems, it is necessary to detect the types of pollutants, so as to "suit the remedy to the case" and carry out treatment.

Biosensor detection is fast and accurate. It solves the problem that samples must be taken back to the laboratory for detection in the past, and can realize online detection. For example, the wastewater discharge of the factory can detect whether the wastewater meets the discharge standard in real time, which not only improves the work efficiency of the inspectors, but also does not affect the normal operation of the factory. It can be used to detect phenolic microorganisms in wastewater, anionic surfactants, heavy metals in soil, endocrine disruptors and water eutrophication.

The world continues to pay attention to the environmental pollution caused by heavy metal ions. It is becoming more and more important to monitor the content and variety of heavy metal ions in the environment. Scientific researchers have developed selective heavy metal ion sensors based on nanoparticles. Darbha et al. Developed a sensor based on gold nanoparticles, which can quickly and accurately detect hg2+ in aqueous solution. It is monitored by super Rayleigh scattering technology, and its sensitivity is 5ppb.

With the increase of cu2+ concentration in aqueous solution, the gold nanoparticle solution changes from red to blue. The sensor is faster than the color nano sensor, and the sensitivity of quantitative detection of cu2+ is 10-5m. Xue et al. Developed a novel and practical mercury colorimetric room temperature control system based on hg2+ induced T-T base pairs. The system uses nanoparticles with a visible particle size of 14 nm, and the lower detection limit of hg2+ is 3.0ppb.

At present, the research hotspots of modern sensing technology mainly focus on optical sensors, chemical sensors, biosensors, medical sensors and multi-sensor fusion technology. In terms of environmental detection, after years of development, the sensor technology has developed to the nano scale. The nano material sensor has high selectivity, sensitivity and stability, and low cost, which has attracted extensive attention of scientists. By changing the type and combination of nano materials, a sensor for heavy metal ions, ethanol and other substances has been developed, which has made a significant contribution to the field of environmental detection.

Sensors have already penetrated into such extensive fields as industrial production, space development, ocean exploration, environmental protection, resource investigation, medical diagnosis, bioengineering, and even cultural relics protection. It is no exaggeration to say that almost every modern project, from the vast space to the vast ocean to various complex engineering systems, is inseparable from a variety of sensors.