1. Solar energy industry (core scenario): photovoltaic power plant sitting (evaluating the potential of direct radiation resources, directly determining the power generation efficiency of photovoltaic modules), power plant operation and maintenance (real-time monitoring of direct radiation intensity, accounting for power generation efficiency deviation); solar thermal power plant concentrating system design and performance testing (direct radiation is the core energy source of solar thermal power generation).
2. Meteorological and climate research: core observation indicators of surface weather stations and radiation observation stations, recording the temporal and spatial changes of direct radiation; as input parameters of climate models, study the interaction of direct radiation with cloud cover and aerosols, and support the analysis of global climate change.
3. Agriculture and Ecology: Accurately calculate the direct component of photosynthetically active radiation in crops to guide the planting layout of high-light-efficient crops; monitor the impact of direct radiation changes on vegetation photosynthesis, growth and development, and optimize agricultural production management.
4. Building and energy conservation: building lighting design (optimizing window orientation and shading systems based on direct radiation data); green building energy consumption assessment (analysis of the impact of direct radiation on building indoor temperature and air conditioning energy consumption).
5. Scientific research fields: atmospheric optics research (direct radiation attenuation law inversion of atmospheric aerosol concentration); astronomical radiation research (calculation of theoretical total direct radiation at different latitudes and seasons).

Product Parameters:
1. Measurement range: common 0~2000 W/㎡ (Adapt to the conventional intensity of ground direct solar radiation, up to 1000~ 1300 W/㎡ at noon on sunny days).
2. Spectral response: 280~ 3000 nm (covering the full spectrum of direct solar radiation, matching the true spectral distribution of solar radiation).
3. Accuracy: ≤ ± 2% (core indicators, reference to international standards (such as ISO 9060) calibration, direct measurement accuracy requirements are higher than the total radiation meter).
4. Response time: ≤ 10 seconds (90% response) (quickly capture short-term fluctuations in direct solar radiation, adapt to sudden scenarios such as cloud occlusion).
5. Temperature coefficient: ≤ ± 0.03%/℃ (lower temperature coefficient, reducing the impact of high and low temperature environments on precision detection components, improving measurement stability).
6.Field of view: 2.5 °~ 5 ° (narrow field of view is the core feature, accurately locking direct sunlight, effectively eliminating sky scattering radiation interference).
7. Cosine response: ≤ ± 1% (0~ 80 ° zenith angle) (adapt to the change of solar altitude angle to ensure accurate direct radiation measurement at different times).
8. Blackout tape/baffle: Built-in blackout structure to further shield the interference of scattered radiation and ground reflected radiation.