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Sensors represent the most fundamental and cutting-edge layer of IoT technology. This paper provides an objective and accurate overview of sensors, covering their definition, development history, classification, characteristics, industrial chain, and market prospects. It is structured around sections such as an overview of the sensor industry, market analysis, factors driving market growth, analysis of key enterprises, and the future development prospects of the industry. Through this analysis of the current state of the sensor industry, it summarizes the present situation of both the sensor and IoT industries. With the development of industries such as Internet of Things information processing and application services, the market size of the Internet of Things sector is expanding rapidly. The IoT industry is developing rapidly, with broad market prospects. Against this backdrop, the sensor market has also seen further growth. Data shows that in 2018, the scale of China’s sensor market was nearly 150 billion yuan. By 2022, as the applications of sensors expanded in China, the market size grew further, with projections indicating that it would exceed 250 billion yuan. Sensors: yunrun.com.cn/tech/2712.html 1. Definition of sensors: A sensor is a detection device that is capable of sensing the information related to the quantity being measured. It can then convert this sensed information into electrical signals or other forms of information as required, so as to meet the needs for information transmission, processing, storage, display, recording, and control. It is the primary step in achieving automatic detection and automatic control. The existence and development of sensors have endowed objects with senses such as touch, smell, and taste, gradually making them more alive. They are generally classified into ten categories based on their basic sensing functions: thermosensitive elements, photosensitive elements, radiation-sensitive elements, magnetosensitive elements, humidity-sensitive elements, acousticsensitive elements, radiation-sensitive elements again, color-sensitive elements, and taste-sensitive elements. 2. Development history of sensors ① First stage: 1950–1969, structural sensors. Structural sensors primarily utilize changes in structural parameters to detect and convert signals. ②Phase 2: 1970–1999, solid-state sensors. Solid-state sensors are composed of solid components such as semiconductors, dielectrics, and magnetic materials, and they are created by utilizing certain properties of these materials. Phase 3: 2000 to the present, smart sensors. Smart sensors possess the ability to detect external information, perform self-diagnosis, process data, and adapt to changing conditions; they represent a combination of microcomputer technology and sensing technology. 3. Sensor industry chain: The sensor industry chain comprises five major segments – planning and design, components and materials, production and manufacturing, packaging and testing, and application equipment – which are interconnected and influence one another. 4. Sensor classification: Sensors are generally classified into ten categories based on their basic sensing capabilities, namely thermosensitive elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, magnetosensitive elements, humidity-sensitive elements, sound-sensitive elements, radiation-sensitive elements, color-sensitive elements, and taste-sensitive elements. ①Based on their applications, sensors can be classified into pressure- and force-sensitive sensors, position sensors, level sensors, energy consumption sensors, speed sensors, acceleration sensors, radiation sensors, temperature sensors, etc. ②Classified by principle, sensors can be divided into vibration sensors, humidity sensors, magnetic sensors, gas sensors, vacuum level sensors, biosensors, and so on. ③Classified by the output signal, sensors can be divided into analog sensors, digital sensors, switch sensors, etc. ④Classified by manufacturing process, sensors can be divided into integrated sensors, thin-film sensors, thick-film sensors, ceramic sensors, etc. ⑤Classified by measurement purpose, sensors can be divided into physical sensors, chemical sensors, biological sensors, etc. ⑤Classified by composition: Sensors can be divided into basic sensors, combined sensors, application-specific sensors, etc. ⑥Classified by their mode of operation, sensors can be divided into active sensors and passive sensors. 5. Sensor characteristics ① Static characteristics of sensors: The static characteristics of a sensor refer to the relationship between its output and the input when a static input signal is applied. Since both the input and output are independent of time, their relationship, that is, the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with the input as the abscissa and the corresponding output as the ordinate. The main parameters characterizing the static characteristics of sensors are: linearity, sensitivity, hysteresis, repeatability, drift, resolution, and threshold. ②Sensor dynamic characteristics refer to the output behavior of a sensor as the input changes. In practical applications, the dynamic characteristics of a sensor are often expressed by its response to certain standard input signals. This is because the sensor’s response to a standard input signal can be easily determined using experimental methods, and there is a certain relationship between its response to a standard input signal and its response to any input signal; often, knowing the former allows one to estimate the latter. The most commonly used standard input signals are step signals and sine signals; therefore, the dynamic characteristics of sensors are also often expressed in terms of step response and frequency response. ③Linearity: Under normal circumstances, the actual static characteristic output of a sensor is in the form of a curve rather than a straight line. In practical applications, in order to ensure that instruments provide readings with uniform scales, a single fitting line is reused to approximate the actual characteristic curve; linearity (non-linear error) is a performance indicator of the degree of this approximation. ④Sensitivity: Sensitivity refers to the ratio of the change in the output △y to the change in the input △x, under steady-state operating conditions of the sensor. ⑤Resolution refers to the ability of a sensor to detect the smallest possible change in the quantity being measured. In other words, if the input value changes slowly from a certain non-zero value, the sensor’s output will not change as long as the change in input does not exceed a certain threshold; the sensor is unable to detect such changes in input. Only when the change in input exceeds the resolution limit will the sensor’s output change. 6. Sensor Market Analysis ① Global Sensor Market Situation: The rapid development of the global Internet of Things industry has driven further growth in the sensor market. Data shows that in 2013, the global sensor industry’s market size exceeded 10 billion dollars. In 201, the global sensor industry’s market size exceeded 200 billion dollars. In the global sensor market, flow sensors, pressure sensors, and temperature sensors account for a large proportion. Among them, flow sensors account for about 21%, pressure sensors make up around 19%, and temperature sensors also account for over 10%. However, other types of sensors such as displacement sensors, speed sensors, voltage sensors, fiber optic sensors, and emerging sensors together also account for nearly half. ②The status of the sensor market in our country: In recent years, the Internet of Things industry has developed rapidly, offering broad market prospects. Against this backdrop, the sensor market has also seen further growth. According to statistics, the scale of China’s sensor market in 2018 was nearly 150 billion yuan. In 2019, sensors saw an expansion in their areas of application, and the market size continued to grow; it is estimated that the market size for such devices in China in 2019 was nearly 200 billion yuan. ③Regional distribution of sensor manufacturers. The sensor market holds great prospects, prompting domestic companies to enter this field one after another. Currently, there are as many as 66 sensor-related companies listed in China, mainly concentrated in the Yangtze River Delta region. In addition, the distribution is fairly even among the Pearl River Delta region, the Beijing-Tianjin area, and the central region. According to statistics, 38% of the sensor-related companies listed are located in the Yangtze River Delta region, with a total of 25 such companies ； The Pearl River Delta region accounts for 17%, with 11 enterprises ； The central region also accounts for 17%, with 11 enterprises ； The Beijing-Tianjin region accounts for 15%, with 10 enterprises ； The Northeast region accounts for 3%, with 2 enterprises. ④Distribution of operating revenues among sensor manufacturers: Among the 25 domestic sensor-related listed companies, 12 are engaged in the production of smart sensors, meaning that nearly half of these companies are involved in research related to smart sensors. Looking at the distribution of operating revenue, those exceeding 10 billion yuan account for only 16%, while those exceeding 50 billion yuan total 365. Furthermore, 40% of enterprises have an annual operating revenue of less than 2 billion. 7. Drivers of the sensor market: The rise of the Internet of Things, favorable policies, advancements in patent technology, and the integration of sensors with robots are all factors that contribute to the development of China’s sensor market. ①With the rise of the Internet of Things, along with advancements in \"sensing technologies\" such as facial recognition, voice commands, eye tracking, and gesture control, a range of new business models have emerged as a result of the Internet of Things, including smart cities, smart cars, and intelligent transportation systems. As the foundation for these new business models, the development of sensing technologies and devices related to the Internet of Things is of particular importance. With the rapid development of emerging industries such as the Internet of Things and mobile agriculture networks, the sensor industry has also seen significant opportunities for growth. The advancement of informatization and intelligence has created a huge market for the sensor industry; sensors have broad application prospects in areas such as smart agriculture, smart grids, healthcare, and smart wearables. Against this backdrop, the sensor market has also seen further growth. ②**Positive policy support ◆ May 2015 – Made in China 2025. This initiative has accelerated the development of China’s sensor and Internet of Things industries by promoting integration, innovation, ecosystem development, and clustering. ◆May 2015 – The 13th Five-Year Plan for Scientific and Technological Innovation called for increased efforts in the research and development of new types of sensors, as well as greater focus on research into the common fundamental technologies used in industrial sensor manufacturing, with the aim of improving these manufacturing capabilities ； In the section on advanced manufacturing technologies, it is proposed to develop MEMS (Micro-Electro-Mechanical Systems) sensors in order to enhance independent R&D capabilities. Efforts should be made to advance research on key components for industrial sensors, smart instruments, and sensor integration applications, as well as to strengthen the use of industrial sensor technology in the development of intelligent manufacturing systems, thereby improving the technological innovation capacity of the industrial sensor industry ； In the section on technologies for the development and utilization of marine resources, it is proposed to develop sensors and instrumentation systems for monitoring nearshore environmental quality. ◆May 2017 – Three-Year Action Plan for the Smart Sensor Industry: 4 key tasks were outlined; the first of these was to address the weaknesses in design and manufacturing processes, thereby enabling smart sensors to move up to the mid-to-high-end market segment ； Secondly, smart sensor application demonstrations are carried out in key industry sectors such as consumer electronics, automotive electronics, industrial control, and healthcare ； Establish a 30 Smart Sensor Innovation Center to further enhance capabilities in technology research and development, standards, intellectual property, testing, and public services, thereby supporting the innovative development of the industry ； Fourth, plan and layout reasonably, further improve the industrial chain, and promote the clustered development of industries. ◆ December 2017 – The Three-Year Action Plan for Promoting the Development of the New Generation of Artificial Intelligence Industries called for prioritizing breakthroughs in core technologies such as intelligent sensors. By 2020, it was aimed that the performance of piezoelectric sensors, magnetic sensors, infrared sensors, gas sensors, etc. would be significantly improved; acoustic sensors with a signal-to-noise ratio of 70 dB and an acoustic overload point of 135 dB would be mass-produced; pressure sensors with an absolute accuracy within 100 Pa and a noise level below 0.6 Pa would be made commercially available; and magnetic sensors capable of detecting weak magnetic fields with a resolution of 1 pT would also be mass-produced. It has reached international advanced levels in simulation, design, MEMS manufacturing processes, packaging, and customized testing technologies, and possesses the capability to design system solutions for key fields such as mobile wearables, the Internet, and automotive electronics. ③Driven by proprietary technology, in recent years there has been a continuous increase in the number of institutions abroad engaged in sensor technology research and development, as well as in the funding allocated to such efforts, leading to rapid progress in sensor technology. With the continuous successful development of advanced sensors, new types of sensors, as well as low-cost and high-performance sensors, the cost of using sensors will continue to decline, and their performance will keep improving, thereby driving the sustained growth of the sensor industry. The development of applications such as the Internet of Things, consumer electronics, and intelligent management has driven rapid growth in China’s sensor market. As the carriers for implementing Internet of Things services, sensors play a crucial role in this field. In various Internet of Things application systems such as smart grids, smart healthcare, intelligent transportation, as well as smart homes, smart surveillance, and smart buildings, sensors serve an essential function. In recent years, driven by demand from end-user applications, new technologies and products related to sensors have developed rapidly. Many new technological advancements have emerged in fields such as MEMS sensors, magnetoresistive sensors, and thermal sensors. ④Sensors + robots: As one of the foundations of information technology, sensors are now present in both production and daily life. Whether it’s in robots and autonomous vehicles, smartphones and smart homes, or the smart cities that are under development, sensors can be found everywhere. Among these, the application of sensors in the robotics industry has received significant attention from most ** countries, particularly the United States and Japan. Driven by these advanced ** countries, a boom in the development of \"intelligent sensors\" has emerged worldwide, and China is also part of this trend and is taking active steps to respond to it. The combination of robots and sensors can be described as producing a truly wonderful chemical reaction. Sensors are to robots what various sensory organs are to humans; they endow robots with five types of sensory capabilities – vision, touch, smell, and taste – enabling them to have a flexible body, sensitive intelligence, and fully automated operation. At the same time, the sensors can also detect the operating status of the robot from within, ensuring its stability and sensitivity in performance; they can also monitor the working environment and the condition of the objects handled by the robot from the outside, thereby ensuring the safety of the human-robot interaction. 8. Future prospects of the sensor industry ① Sensors are evolving towards being greener, more energy-efficient, and more efficient. With continuous technological advancements and rising economic standards, environmental protection has become a lifestyle that Chinese people are keen to promote. To better align with the trend of green energy development, more efforts will be invested in the future to enhance its green, energy-saving, and efficient characteristics. Through its high-precision measurement capabilities, it will facilitate interaction within the industrial chain, thereby promoting the green development of society. ②Development toward intelligence and portability: With the rise of intelligent manufacturing, smart cities, and other intelligent technologies, along with the rapid development of the Internet of Things, this will drive growth in the sensor market. Sensors are evolving towards being smaller in size, more intelligent, and less costly. ③Consumer electronics drive the development of motion sensors. Applications in consumer electronics contribute the most to the market for motion sensors, driving this market to grow at a faster pace than the overall market; motion sensors are another type of sensor that holds great potential in numerous current applications. The main applications of motion sensors include consumer electronics, gaming and entertainment products, automobiles, healthcare, and the industrial sector.