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Development of new sensor technologies
The development of new sensor technologies has become a crucial area of innovation in the modern era. A sensor is a device that converts physical, chemical, or biological quantities into electrical signals, such as voltage, current, frequency, or pulses. These signals can be used for information transmission, processing, recording, and control, making sensors essential components in automatic detection and control systems. Often compared to the human senses, sensors play a key role in gathering accurate data, which directly affects the performance and reliability of any system.
As automation increases, so does the demand for more advanced, reliable, and cost-effective sensors. In today’s information-driven world, sensor technology is one of the three pillars of the information industry, alongside communication and computing. Thanks to advances in integrated circuits, computer science, and communication systems, modern sensors are not only more accurate and fast but also smaller, cheaper, and easier to use. Traditional sensors are gradually being replaced due to limitations in size, cost, and functionality. Many developed countries are actively investing in the research and development of next-generation sensor technologies, achieving significant progress.
New sensor technologies are currently focusing on several key areas. First, they aim to discover and utilize new physical, chemical, or biological phenomena as the basis for sensing. For example, Japan's Sharp Corporation has developed a high-temperature superconducting magnetic sensor, offering high sensitivity and simpler manufacturing than other similar devices. Another example is immunosensors, where antibody-antigen interactions change electrode potential, enabling rapid and accurate detection of specific substances, such as hepatitis viruses.
Second, the use of new materials has opened up exciting possibilities. Polymers, optical fibers, and ceramics are now used to create highly sensitive and durable sensors. For instance, polymer-based humidity sensors measure changes in dielectric constants, while ceramic capacitive pressure sensors offer high stability and accuracy. Optical fiber sensors, in particular, have gained attention for their high sensitivity, compact size, and resistance to harsh environments, making them ideal for industrial and medical applications.
Third, micromachining techniques have enabled the creation of micro-scale sensors using semiconductor and thin-film processes. Companies like Yokogawa and Silicon Microstructure Inc. have developed silicon-based microsensors with high precision and small size, suitable for aerospace, biomedical, and industrial applications. These sensors can detect even the smallest changes in pressure, temperature, or force, offering great advantages over traditional models.
Fourth, integrated sensors combine multiple functions—such as calibration, compensation, and communication—on a single chip, reducing costs and increasing efficiency. The U.S. company LUCAS, for example, produces high-volume, low-cost blood pressure sensors.
Finally, intelligent sensors incorporate microprocessors, allowing them to perform data processing, self-diagnosis, and error correction. These smart sensors can communicate directly with computers, making them highly versatile and reliable. The HONEYWELL ST-3000 is an example of a highly integrated smart sensor, combining various functions into a compact package.
In conclusion, the evolution of sensor technology continues at a rapid pace, driven by scientific advancements and growing demands across industries. While China still faces challenges in this field, increased investment and research can help close the gap and promote the development of its instrumentation and technological capabilities.