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Puntino天文望远镜调校系绞/div>
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Puntino 简今/td>

Puntino 是基于Shack-Hartmann 波前探测原理的紧密仪器，用于测试 single focal ratio telescope 或光学元件。经常使用它的部分客户有:

新墨西哥 3.5m Apache Point 天文望远

美国Virginia大学 1m 的FAN 望远

Kavalur Observatory-2.3m VBT telescope

Indian Institute of Astrophysics-2m HIROT telescope

日本东京大学 2m MAGNUM telescope

.......

Puntino 波前探测系统是一个非常紧凑的测试仪器(外形尺寸取决于focal ratio)，可以用于天文望远镜作为离线测试和在线（主动光学元件）测试应用。也可以在实验室用于测试光学元件、/p>

Puntino 波前探测系统?个CCD探测器，一个用于获取SH图像，一个用于获取星像。第二个CCD还可以获得镜面或透镜的瞳像。这样可以获得更多的光学参数及成像质量信息。对于一?.9米的镜面，将获得一下信息：

镜面抛光的残留物清晰可见

光孔不够圆（侧面的支撑调节不到位，过大）

亮点是由于镜面表面的气流影响

中间的洞是副镜的阴影

十字形是副镜的支撑架造成的阴彰/font>
Puntino 功能及特炸/td>
Puntino-Pro wavefront sensor in the laboratory and mounted at the telescope.
Wavelength range:390 nm -1100 nm
产品主要特点
  • For testing astronomical telescopes
  • Wavefront sensor with in-built motorized light source for getting the reference calibration image in remote mode (to compensate for temperature changes and that flexure caused by the change of telescope position
  • Wavefront analysis is done using a cooled camera for long integration times (to integrate out seeing effects)
  • Second uncooled camera is used for analysis of the out-of-focus pupil of the telescope giving additional information like alignment of the spiders of the primary and secondary mirrors zones on the mirror surface support problems etc.
  • Standard sampling: 26 x 26 spots
  • Focal ratios from f/1.8 up to f/300
软件功能
  • Measure the aberrations ( up to 70 terms of the Zernike polynomials)
  • Estimate optical quality and Strehl ratio
  • Inspect the wavefront corresponding to any aberration
  • Focus your telescope. The program gives the magnitude (in mm) and the direction for effecting the correction
  • Align your telescope in minutes instead of hours. Use the indications given by the software (magnitude and direction) to move the secondary mirror for effecting the alignment. It takes the guesswork out of alignment
  • Find out the correct focal plane using the spherical aberration measured by PuntinoPro. The program again gives you the magnitude and direction in which to move the secondary mirror or the focal plane
  • Helps identifying support errors at the zenith by shown by the wavefront map after mathematically subtracting the lower order aberration
  • Optimize dome and mirror seeing by inspecting the plots of the residuals
  • On-line display of how the aberrations change during the night
  • Based on the Shack-Hartmann data the MTF of the telescope can be computed
  • Build/refine a sophisticated pointing model for the telescope using the indications given by PuntinoPro of the shift of image in the focal plane of the telescope for different positions in the sky
  • PuntinoPro comes with detailed on-line help and a hardware and software user's manual containing both theory and practical examples to guide you in getting the correct interpretation out of the Shack-Hartmann analysis
  • Measurement of combined external seeing dome and mirror seeing using the second CCD camera
Puntino 主要技术指栆/td>

Feature /项目

Specification / 说明
Type of element that can be measured Astronomical telescopes (at Cassegrain Prime and Newtonian focus). Telescopes in the laboratory. Lenses in external illumination
Focal ratios covered f/1.8 to f/300 standard. Faster focal ratios can be tested with special setup
Diameter of optical element that can be tested Practically any diameter
Diameter of lenslets 0.3 mm
Focal length of lenslets 41 mm
Standard sampling on the pupil About 26 x 26 spots
Maximum sampling Up to 70 x 70 spots can be used (camera dependent)
Analysis Software Sensoft
Precision of Zernike polynomials coefficients (laboratory) /300
Precision of Zernike polynomials coefficients (telescope) 0.01 "
Precision with which the wavefront is computed /150 rms
Wavelength range With standard camera from 0.375 up to 1.1 . With IR camera up to 2
Reference source LED with cooled camera. Remotely controlled
Distance from flange to instrument focus 54.8 mm
Height of optical axis from base 61.5 mm
Camera for SH 16-bit cooled CCD
Camera for finder 10-bit uncooled CMOS 1280 x 1024 pixels 7.5 pixel size or 14 or 16-bit cooled CCD
Dimensions (depends from focal ratios tested) 9 (Height) x 22 (Length) x 9 (Width) cm
Power requirement (stepper motor) 12V 500 mA

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