Affected by cold air, from March 22 to March 24, a total of 38 counties and cities in the central and northern regions (Ningde, Fuzhou and Nanping, Sanming, and Longyan West) have three consecutive days of average daily temperature ≤12 °C unfavorable spring sowing The low temperature and rainy process.
It is expected that the temperature in Fujian Province will remain low in the next three days. In particular, most of the counties and cities in the central and northern regions will continue to have low temperature and rainy weather. In the north central region, there will be a continuous cold weather of 5 to 6 days with an average daily temperature of ≤12 °C.
It is expected that after 28th, the temperature in Fujian Province will rebound significantly, and there will be a favorable spring sowing period with a daily average temperature of ≥12°C for about 5 days.
It is recommended that the relevant parties continue to do the cold-proof work for early rice planting and breeding, especially in the central and northern regions, soaking in low-temperature and rainy periods, catching the “cold-tailed warm headâ€, soaking seeds and germination on the 26th, and waiting for the temperature to rise on the 28th. Sowing to effectively protect against low temperature hazards.
Littrow prisms feature 30°, 60°, and 90° angles .30° - 60° - 90° Littrow Dispersion Prisms can be used for a variety of applications. Uncoated littrow dipersion prisms are used to disperse light into its component spectrum. Coated littrow dipersion prisms are used to deviate the line of sight by 60°.
Dispersion Prisms (Uncoated)
Collimated white light enters into the A-C surface of the prism, is reflected at the hypotenuse surface, and then dispersed into its component spectrum at the B-C surface. Although Littrow prisms produce narrower dispersion than equilateral prisms, Littrow prisms are typically less expensive.
Beam Deviation Prisms (Coated)
Incident light enters into the aluminum coated B-C surface of the prism at the nominal angle and returns back using the same path. In spectrum dispersion applications utilizing white light, the resolution performance of Littrow prisms is equal to equilateral prisms since the optical path length through the glass substrate is the same distance round-trip. Additionally, light entered into the A-C surface will reflect twice inside the glass substrate before being emitted through the hypotenuse surface at 60°.
Dispersion Prism,Optical Dispersion Prisms,Beam Deviation Prisms,Inked Dispersion Prism
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