In recent years, haze weather has adversely affected people's lives and health, making research into particulate matter detection technology urgent. The core technology for detecting particulate matter concentration is designing accurate and reliable dust concentration sensors. Compared to domestic efforts, foreign research on dust sensors started earlier and the technology is more mature; these sensors are widely used in military, aerospace, industrial control, and detection technology. Detection methods for PM2.5 include the gravimetric method, tapered element oscillating microbalance (TEOM) method, beta-ray absorption method, and light scattering method. The sensors used in these methods are complex, expensive, and heavily influenced by external factors.

Based on the basic principles of photoelectric sensors, using mature through-beam detection modes, and employing laser sources with high brightness, sensitivity, and stability, a conditioning circuit composed of I/V conversion, voltage amplification, and voltage following with internal gain can be optimized and innovated. This realizes accurate detection of particulate matter by the sensor, as proven by experiments, resulting in a sensor with a simple structure, stable and reliable performance, accurate measurement, and high sensitivity.

The recently launched LD13 laser PM2.5 dust sensor and LD15 laser PM2.5 dust sensor by Guangzhou Luftmy Intelligent Technology Co., Ltd. are both developed and produced based on the basic principles of photoelectric sensors. They achieve a simple internal structure, stable and reliable performance, accurate measurement, and high sensitivity, while offering price advantages over laser dust sensors from other competitors in the market.