Full
Outline
The laser interferometry absolute gravimeter uses the stable frequency laser wavelength as the precise length reference, and the selection of reference source directly affects the accuracy and precision of the measurement results. We focus on the differences in engineering applications between iodine saturated absorption stable frequency lasers and thermally stable frequency lasers. The wavelength accuracy and repeatability of thermally stable frequency lasers are analyzed in detail. We construct a beat frequency measurement system based on iodine stable frequency laser reference, which achieves the measurement of wavelength accuracy and repeatability of thermal stable frequency laser. A statistical processing model with the same final result of absolute gravity measurement is spmpled to quantify the repeatability and accuracy of output wavelength of the tested laser. The results show that the output wavelength accuracy of the tested thermally stable frequency laser is better than 4×10-9 nm, and the repeatability is better than 1.86×10-6 nm. That is, during the locking process of the thermal stable frequency laser, the gravity measurement error caused by wavelength accuracy is much smaller than 1 μGal, and the absolute gravity measurement error caused by wavelength repeatability is 2.79 μGal, which is acceptable for the absolute gravity measurement requirement of 10 μGal observation accuracy. This provides a complete metrological basis for the engineering application of absolute gravity instruments based on thermal stable frequency lasers in field environment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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