红外线加热技术是从1938年美国开始的。在二次大战后,日本引进则用于对车辆的涂料、木材、食品、橡胶、树脂的干燥加热。这个时期,工业用红外线发热体多为钨、镍、铬合金等电阻发热体封入玻璃和石英一类物质中。这些发热体的波长最长限度为4微米～5微米,只是利用近红外线来加热,使水分在近红外区的吸收带吸收辐射热线,因而加热效率不是很高的。随着分光技术等近代科学的发展,近几年来日本各地出现了远红外线发光体,有效长光波长可到50微米或更长。从60年代起,西德、日本、法国、苏联等国家即将红外加热技术用于混凝土的加速硬化工 Infrared heating technology began in the United States in 1938. After the Second World War, Japan introduced dry heating for paints, wood, food, rubber, and resins for vehicles. During this period, infrared heating elements for industrial use were mostly filled with resistance heating elements such as tungsten, nickel, chromium alloys, and the like. The longest wavelength limit of these heating elements is 4 μm to 5 μm, and the use of near-infrared heating alone makes the absorption band of moisture in the near-infrared region absorb radiation heat, and thus the heating efficiency is not very high. With the development of modern science such as splitting technology, far-infrared emitters have appeared in various parts of Japan in recent years, and the effective long-wavelength can reach 50 micrometers or more. From the 60s, Western Germany, Japan, France, the Soviet Union and other countries are about to use infrared heating technology for accelerated hardening of concrete.