The Development History and Trends of Instrument and Equipment Technology

Instruments and equipment, as the source of scientific information, are important tools for humankind to acquire knowledge about nature and understand the world. They act as a bridge and link in the logical relationship between humans and nature. So, what stages has the development of instruments and equipment gone through? Looking at the development of instrument technology, the main stages can be summarized as: analog instruments, digital instruments, intelligent instruments, and virtual instruments.

Analog Instruments and Equipment

Before the 1950s, electrical measurement technology was mainly analog. The basic structure of these instruments was electromechanical, and they primarily used pointers to display measurement results. Macroscopic physical quantities are essentially mostly fixed or continuously changing analog quantities; direct measurement of analog quantities is called "analog measurement." Due to the limitations of the instruments themselves, the resolution of the displayed values could only reach 2-3 significant digits, and analog signals (measurement data) were easily affected by noise and interference during the measurement process.

Digital Instruments and Equipment

In the 1950s, the introduction of digital technology and the emergence of integrated circuits led to the gradual evolution of electrical measuring instruments from analog to digital. Its characteristic is the conversion of analog signal measurement into digital signal measurement, and the output of the final result digitally, making it suitable for measurements requiring fast response and high accuracy. These instruments are currently quite common, such as digital voltmeters and digital frequency meters.

With the continuous development of digital instruments, traditional analog instruments are gradually being replaced. Although digital instruments have many advantages, they still have some very important but easily overlooked problems. Some of these problems are inherent to the testing instruments, while others are introduced by the digitization process.

Intelligent Instruments and Equipment

Emerging in the 1970s, intelligent instruments are a product of the combination of modern testing technology and computer technology. Intelligent instruments are measuring instruments containing microcomputers or microprocessors, possessing functions such as data storage, computation, logical judgment, and automated operation; that is, they have a certain degree of intelligence, hence the name "intelligent instruments." Intelligent instruments replace the control links, data acquisition and processing, self-zeroing, self-calibration, and automatic range adjustment functions of traditional digital instruments with microprocessors, thereby improving measurement accuracy and speed.

The emergence of intelligent instruments has greatly expanded the application range of traditional instruments. Intelligent instruments, with their advantages of small size, powerful functions, and low power consumption, have been rapidly adopted in home appliances, research institutions, and industrial enterprises.

Virtual Instrumentation

This concept was proposed as early as the 1970s, but its true realization only became possible after the emergence of bus standards such as PCI, GPIB, VXI, and PXI, and its development accelerated with the introduction of card-based instruments, VXI bus instruments, and PXI bus instruments. Virtual instruments are instruments with a visual interface built by adding relevant hardware and software. They utilize high-performance modular hardware combined with efficient and flexible software to complete various testing, measurement, and automation applications.

Virtual instruments are a product of the perfect combination of modern computer technology and instrument technology. Software plays a crucial role in the entire process of instrument development and use; it can be said that without software, there are no virtual instruments. Based on the idea that "software is the instrument," it uses the latest computer technology to realize and expand the functions of traditional instruments, truly enabling users to design and define instruments that meet their specific requirements. However, virtual instruments rely on data acquisition cards, which have two limitations: 1) frequency is limited, typically only a few GHz; 2) measurability is poor, and traceability is difficult.

To date, the application range of instruments and equipment is very wide, and with technological advancements, its application areas will expand even more rapidly. Modern technological progress has broadened and deepened the application of instruments and meters. All of this undoubtedly provides a powerful impetus for the further development of instruments and meters and presents a bright future.

The advancement of science and technology constantly places higher and newer demands on instruments and meters. The development trend of instruments and meters is to continuously utilize new working principles and adopt new materials and components, such as utilizing principles of ultrasound, microwaves, X-rays, infrared rays, nuclear magnetic resonance, superconductivity, and lasers, and employing various new semiconductor sensing elements, integrated circuits, integrated optical circuits, and optical fibers. The aim is to achieve miniaturization of instruments and meters, reduce weight, lower production costs, and make them easier to use and maintain. Another important trend is to improve the performance of instruments and meters through the use of microcomputers, increasing their automation, intelligence, and data processing capabilities. Instruments and meters are not only used for individual purposes, but can also be integrated with computers through standard interfaces and data channels to form various comprehensive testing, control, and management systems, meeting higher requirements.

The instrumentation industry is a newly developing industry in China. While aligning with international standards, China's instrumentation industry has made significant progress and gained the strength to compete internationally. Through various means such as technological breakthroughs, joint development, joint ventures, and the assimilation and localization of imported technologies, the gap between some of China's leading mid-to-high-end instrumentation products and international advanced levels has been narrowed, and production capacity has been formed. A number of state-owned, collective, private, and foreign-invested enterprises and research institutes have emerged in the industry through market competition, demonstrating good development momentum and potential, and have formed leading and core forces.

In the future, my country's instrumentation industry needs to further develop its advantageous products and expand exports; improve the technical and management levels of enterprises and strengthen independent innovation capabilities; strive to expand the application fields of instrumentation technology, enhance market competitiveness, and truly enter a stable development stage for the instrumentation industry.