Application of laser technology in the sensor industry

According to the national standard GB7665-87, sensor is defined as a device that can sense the specified measured quantity and convert it into a usable output signal according to a certain rule. As a detection tool, the sensor is required to detect the physical or chemical information of the research object, and it needs to have strong adaptability to harsh environments and high stability and reliability. According to the above characteristics of the sensor, the processing of the sensor needs to be stable, reliable and high precision. However, traditional processing technology is difficult to meet the requirements, which has brought the sensor industry into a dilemma! Now, a new processing technology has been born-laser technology, which has brought good news to the sensor industry. Laser technology solves the problems of sensors in marking, welding, and resistance adjustment. The basic principle of laser marking is that a high-energy continuous laser beam is generated by a laser generator. When the laser acts on the printing material, the atoms in the ground state transition to a higher energy state; atoms in a higher energy state are unstable and will quickly return to the ground state. When the atoms return to the ground state, they will release additional energy in the form of photons or quanta, and convert light energy into heat energy, causing the surface material to melt instantly, or even vaporize, thereby forming a graphic mark. Laser marking is efficient, accurate and low-cost, and the mark is permanent and indelible, which enhances its traceability. The laser welding machine uses a pulsed laser with a wavelength of 1064nm generated by a laser to radiate the surface of the workpiece after beam expansion, reflection and focusing. The surface heat diffuses to the inside through heat conduction. Through digital precise control of the laser pulse width, energy, peak power and repetition frequency and other parameters, the workpiece is melted to form a specific molten pool, thereby realizing laser welding of the workpiece. Laser is used to seal the metal shell of the sensor, which is currently one of the most advanced processing methods. Laser welding has the characteristics of beautiful and firm welds, small heat-affected zone, high efficiency and low welding cost. Laser resistance adjustment is controlled by a computer to control the movement of the laser. High-energy laser pulses are used to act on the resistor material. After absorbing light energy, the resistor material is rapidly heated and vaporized, and the material is evaporated to form a circular spot on the resistor. When a series of partially overlapping laser pulses hit the resistor material, a cut will be formed. The resistor can be adjusted to the set nominal value by using appropriate cut shape and length. Laser resistance trimming has high processing accuracy, good repeatability, fast speed, high efficiency, and is easy to automate the entire processing process .