Atmospheric optical parameter measuring instrument

The multi-parameter atmospheric optical parameter measuring instrument can use stars as a light source, and can measure the three key atmospheric optical parameters of atmospheric coherence length, extraatmospheric scale and lateral average wind speed on the light propagation path at the same optical path and time, and the instrument structure is simple and easy to operate.

tmospheric coherence length is an important parameter in the spatial spectrum representing turbulence, which characterizes the intensity of atmospheric turbulence and adaptive optical phase throughout the processCalibration techniques are widely used. Large-scale turbulence plays a major role in the phase fluctuation of light waves, and the limited extraatmospheric scale has a great influence on the measurement of statistical characteristics of atmospheric turbulence. The lateral average wind speed in the light propagation path determines the frequency response characteristics of the AO system. Therefore, the measurement of atmospheric coherence length, atmospheric turbulence outer scale, and lateral average wind speed is of great significance in engineering. The measurement method of these parameters is mostly measured by a single device, which is not very convenient to operate.

Multi-parameter atmospheric optical parameter measuring instrument can use stars as light sources, can measure the three key atmospheric optical parameters of atmospheric coherence length, extraatmospheric scale and lateral average wind speed on the optical path and time at the same optical path, of which the atmospheric coherence length is obtained by differential image motion method (DIMM), the outer atmospheric scale can be obtained by image jitter covariance method, and the lateral average wind speed can be obtained by image point jitter velocity method, the instrument structure is simple and easy to operate.

Product Features:

• 1) Using the Meade astronomical telescope, it can track and measure stellar targets at different zenith angles;
• 2) The jitter statistical characteristics of the four image points obtained by the optical imaging system are used, so multiple key atmospheric optical parameters can be calculated at the same time and in the same optical path during one measurement process;
• 3) There is good scalability in technology, hardware update, can realize isohalo angle measurement, and carry out daytime star work, thereby expanding the measurement function.

Performance indicators:

• Telescope aperture: 305mm, focal length: 9144mm;
• The number of pupils of the light pupil plate: 4, and the size of the sub-pupil: 50mm, 80mm, 100mm can be selected;
• CCD sampling frame rate>=70Hz, progressive scan; Sensitivity; The minimum illumination is 0.05lux, and the signal-to-noise ratio >=58.

Interface parameters:

• Communication interface: RS232, BNC, GPS

Electrical characteristics:

• Power supply: 220V AC
• 12V DC
• Maximum power: 500W

Working conditions:

• Working temperature: (-10~+40) °C
• Working humidity: (0~95)% RH
• Operating air pressure: (65-101) kPa

Other indicators:

• Instrument dimensions: Footprint approx. 1500 W × 1500 D×2000 H mm
• Instrument weight: about 75kg

Atmospheric coherence length measuring instrument

A gas coherent length meter is a device used to measure the intensity of turbulence throughout the atmosphere. The device measures the coherent length of the atmosphere using the principle of two-point differential light wave arrival fluctuations, and this set of measuring instruments uses stars as a light source for observation at night and the edge of the sun as a light source during the day.

Main technical indicators of the system:

• Whole layer measurement: measurement accuracy: uncertainty less than ±10%
• Horizontal measurement: Measurement accuracy: uncertainty less than ±10%
• Night observation: When the optical path is cloudless, a 3rd magnitude star can be measured
• Morning and twilight period: When the optical path is cloudless, a magnitude 2 star can be measured