A sensor is a device that can detect and respond to certain physical, chemical, or biological parameters. It converts the measured quantity—such as temperature, pressure, light, sound, or chemical concentration—into an output signal, usually electrical, following specific rules. Sensors are often called detectors or transducers. The output signals can take various forms, such as voltage, current, frequency, or pulse, to meet the needs of information transmission, processing, storage, display, and control.
In automatic detection and control systems, the sensor acts as the front-end component, similar to the human senses, directly capturing external information. Therefore, the accuracy with which a sensor detects and converts information into the required signal plays a crucial role in the overall performance of the system. As automation increases, the reliance on sensors becomes even greater. Because of this, sensors are considered high-tech components worldwide, especially in advanced countries like the United States and Japan, where they have received significant attention and investment.
Since the 1980s, as society moved into a highly industrialized era, the importance of sensors has become more evident. The three core elements of modern information technology are information acquisition, transmission, and processing—often referred to as sensor technology, communication technology, and computer technology. Together, they form the "senses," "nerves," and "brain" of the information system. If the "sense" fails, it leads to distorted data, which then affects the "nerve" system, making even the most intelligent "brain" ineffective. This realization has led to a renewed appreciation for sensors in the information age.
In the 1980s, the U.S. began to recognize the critical role of sensors in the information society. In Japan, sensor technology was ranked among the top ten key technologies, and the former Soviet Union included sensor development as a priority in its military and aerospace programs.
The significance of sensors is also evident in their broad applications across many fields, including industrial automation, agricultural modernization, aerospace, defense engineering, robotics, resource exploration, marine research, environmental monitoring, security systems, medical diagnostics, and consumer electronics. Their development has significantly contributed to advancements in these areas, making them essential tools in both scientific and everyday life.
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