Alpy calibration User Guide
Contents
1. Put back the cover taking care of the servo cable Tighten the three screws that s it 3 2 Replacing the flat lamp Before any maintenance on the calibration module switch off any power supply re move the plug Remove the screw in the middle of the cover and loosen the other two Gently slide the electronics from the calibration mo dule body Take care to protect the halogen lamp du ring this operation Remove the cover Shel 16 INSTRUMENTS CHAPTER 3 MAINTENANCE Remove the halogen lamp rotate a quarter turn Replace the lamp Put back the electronics in the body Tighten the four screws around the calibration module Plug in the servo connector take care of the orientation refer to the circuit markings Put back the cover taking care of the servo cable Tighten the three screws that s it INSTRUMENTS 172. We are really interested to see your results there Enjoy Spectroscopy Olivier Thizy Fran ois Cochard 37 ee Introduction 1 requires additional external 12V signals 2 http www shelyak com 3 http groups yahoo com group spectro l 4 http www spectro aras com forum 5 olivier thizy shelyak com 6 francois cochard shelyak com C INSTRUMENTS 5 Alpy calibration User guide C_ 6 INSTRUMENTS Discover your Alpy calibration module 1 1 Out of the box Cali bration screen deactivated When receiving your Alpy calibration module you ll find in the box the following parts The Alpy calibration module itself t Light going to spectroscope Light coming e Four screws M4x20mm ial rom telescope An Allen wrench for attaching it to the Alpy guiding module 1 2 Alpy calibration specifications Table 1 1 gives detailed specifications of Alpy Calibra tion Figure 1 1 shows all dimensions 1 3 Alpy calibration principle Making accurate measurements in spectroscopy re quires flat field and calibration images taken under the same conditions as the starlight The principle of the Alpy calibration module is as follows When deactivated the light coming from the telescope goes directly to the spectroscope When the calibration module is activated a screen masks the light beam coming from a telescope This screen positioned at 45 is illuminated by the cali bration l
3. for astronom ical spectroscopy The Alpy calibration module al lows you to take quickly and simply flat field and wavelength calibration images manually or even re motely It also can be used to make offset and dark images using a screen that blocks the light from the telescope Equipment configuration The Alpy calibration module is specifically dedicated to the Alpy 600 spectroscope and is optimized for use in combination with the Alpy guiding module The Alpy calibration module can be used in various con figurations but we cannot doccument all of them In this document we consider that you have an Alpy 600 and the Alpy guiding module and you re already familiar with this instrument You will find in the next chapters a presentation of the Alpy calibration module how to install amp tune it on the Alpy 600 and how to observe with it Astronomical spectroscopy is a never ending story We ve thought about a lot of applications for the Alpy instrument you can find some ideas on the Shelyak Instruments website However we know that you ll invent new ones We ll be very happy to take your experiences into account to continuously improve this product do not hesitate to contact us if you have any comments We invite you to join the growing Shelyak Instru ments users and amateur spectroscopist community on the Spectro L Yahoo group and the Aras forum to share your own experiences and ask questions to the community
4. Alpy calibration User Guide Olivier Thizy olivier thizy shelyak com Francois Cochard francois cochard shelyak com ae Wit Alpy calibration module User Guide Olivier Thizy olivier thizy shelyak com Francois Cochard francois cochard shelyak com April 2013 Ref DC0018 rev A Alpy calibration User guide lt _ 2 INSTRUMENTS Table of Contents Introduction 5 1 Discover your Alpy calibration module 7 1 1 OR Ol fhe DO se ET Soke EAH OES a EO EOE CE 7 1 2 Alpy calibration specifications 7 1 3 Alpy calibration principle se a4 sas we EASE SR RE OEE Ow we ww 7 1 4 Power supply 2200 4444444000 4e ee 9 1 5 Mechanical interfaces ws 4 e eed 48 bb ER SEES HHS HOMO CEEE DEH EO 9 2 Using the calibration module 11 2 1 Tesine ihe mod le psss aa m a na oH OSD OHMS REET eae eee ER w ES 11 21 1 Remot Conio ttcseaaeeeewaed RE eS Ee SS EA eee E oe 12 2 1 2 Lamps lifetime saving function 466 4 4 ee su edo SAIAS END EEE HSS 12 2 2 Installing the Alpy calibration module 12 2 3 During observations OOo RSS EE a a I RE AROSE wD we OS 13 3 Maintenance 15 3 1 Replacing the calibration lamp 15 3 2 Replacing the flat lamp 16 C INSTRUMENTS 3 Alpy calibration User guide lt _ 4 INSTRUMENTS Alpy is a family of modular elements
5. amp or flat lamp from the side Calibration screen activated gt at Light going to spectroscope The screen has a black outer area and a central white reflecting area which is designed to make a F 5 beam when used in combination with the Alpy guiding and Alpy 600 modules lt _ INSTRUMENTS 7 Alpy calibration User guide Feature Dimensions Weight Power supply voltage Power supply current Power supply connector Mechanical interface Value Unit Comment 100x95x30 mm see fig 1 1 below 300 g 12 V Positive in the central pin 1 A max standard 5 5x2 5mm 4 screws T mount thread M42x0 75mm Table 1 1 Alpy calibration specifications Figure 1 1 Alpy calibration dimensions INSTRUMENTS CHAPTER 1 DISCOVER YOUR ALPY CALIBRATION MODULE When the screen is in place you can switch on ei ther the calibration light the white halogen light for flat field or neither of them In the last configuration you can take offset or dark exposures the screen pre vents the starlight entering the spectroscope The screen is activated by a servo motor When the calibration module is deactivated the screen is moved out of the telescope beam and has no effect on the light coming from the telescope 1 4 Power supply The Alpy calibration module must be powered with 12V The power supply socket is the central one The connector is a standard 5 5 x 2 5mm with the positive voltag
6. dule is deacti vated the light beam coming from star is open e One LED is on the matching lamp is on and the screen is across the telescope beam Both LEDs are flashing neither lamp is on but the screen is across the telescope beam e One LED is flashing the matching lamp has been au tomatically switched off after 30 minutes to preserve its lifetime Just reset the matching switch to restart the normal behavior LSshelyak 14 INSTRUMENTS lt i va J o E A 4 ee if Maintenance As with any lamps the ones in Alpy Calibration have a limited lifetime If you need to replace these lamps proceed as below We suggest removing the Alpy spectroscope from the telescope to do it but is is not strictly required if you have enough room around the calibration module to use a screwdriver 3 1 Replacing the calibration lamp ow Before any maintenance on the calibration module switch off any power supply re move the plug Loosen the two screws in the calibration lamp con nector Remove the screw in the middle of the cover and loosen the other two Replace the lamp The lamp is asymmetric Put it in the same position as below Remove the cover PShelyak INSTRUMENTS 15 Alpy calibration User guide If you put the lamp in the opposite direction it will apparently work but the lifetime will be significantly shorter Git will become darker and darker over the time
7. e on the central pin outside is ground The current is 1A max It is the halogen lamp which is the main consumer 500mA Of course when the lights are switched off the consumption of the mo dule is only a few uA wy The electronics include a voltage converter from 12V to 300V to excite the Argon gas in the calibration lamp The current is limited to few mA but you must make sure the power sup ply is unpluggged before opening the calibration module 1 5 Mechanical interfaces The Alpy calibration module is mounted on the Alpy guiding module with four M4 screws see drawing 1 1 On both sides of the module there is a standard T mount thread M42 x 0 75mm INSTRUMENTS Alpy calibration User guide LSshelyak 10 INSTRUMENTS Using the calibration module 2 1 Testing the module There are two switches on the Alpy calibration mo dule One is for calibration and the other for the flat field halogen lamp ALED indicates that the lamp is on It will be useful when the Alpy calibration moduleis on the telescope no light other than LED will be visible from outside Plug in the power supply cable and switch on the calibration lamp left switch Now switch off the calibration lamp and switch on the flat lamp This lamp is much brighter than the calibration one The screen moves to the middle of the calibration module and the calibration lamp is illuminated the intensity is low l
8. hen observing the stars the calibration module has no effect on your instrument and images the bration module screen is outside the telescope light beam When observing stars both LEDs should be off Fr helyak Mn Alpy calibration User guide Switch on the calibration lamp when you need to take calibration images It can be done manually or re motely see section 2 1 1 When the calibration lamp is on the matching LED is on as well ep Ensure the lamp is switched off at the end of your calibration exposures Proceed in the same way for the flat lamp Typical exposure times The exposure time depends on several parameters CCD camera equipment configuration but typical expo sure times are e 120 seconds for calibration P Aud ACE visul G AstroTonight ArgNel80 1 fit Ba File View Images Analysis Camera Telescope Setup Help Camera Not connec ted a di 1355 60 277 000000 Auto Im ee 213 Ye 15 04 2013 14 41 00 UT Mount Not connected e 10 seconds for flat field 26 Aud ACE visul G AstroTonight Flat10 3 fit EME File View Images Analysis Camera Telescope Setup Help Camera Not connec ted 15 04 2013 14 39 10 UT Mount Not connected In any case always make sure that your images are not saturated refer to the Alpy 600 user guide LEDs meaning summary Both LEDs are off the calibration mo
9. ook directly at it in a dark room PShelyak INSTRUMENTS 11 Alpy calibration User guide mg The calibration lamp is close to the screen to have maximum efficiency The halogen lamp is on the side to limit its intensity and prevent a too short exposure time You can keep the screen in place and switch off both lights by activating both switches In this configura tion both LEDs will flash slowly When both LEDs are flashing the screen is Ww across the telescope beam but no lamp ca libration or flat is on This is useful for tak ing offset or dark images at night but a separate shutter is still required in full daylight 2 1 1 Remote control Each switch is accompanied by a socket The sockets are mechanically and electronically the same as the power supply one 12V positive voltage on the cen tral pin Powering these connectors with 12V has the same effect as manually switching It allows the Alpy calibration module to be controlled remotely Co When controlling the Alpy calibration mo dule remotely take care that the manual switches are OFF 2 1 2 Lamps lifetime saving function The lamps mainly the calibration one have a limited lifetime In normal conditions it should be without significant effect because the exposure time for ca libration spectra is short a few seconds each But we know by experience that it is possible to forget to switch off the lamps at the end of
10. the night To pro tect the lamps we ve added a feature which automa tically switches off the lamp after about 30 minutes This also works for the flat lamp When this happens the corresponding LED flashes You can simply switch off the lamp and switch it back on again immediately it will be back on for 30 minutes max e When one LED is flashing the lamp has been switched off to protect the lamp s lifetime 2 2 Installing the Alpy calibration module This sections explains how to install the calibration module on the Alpy guiding module Alternatively you can adapt the installation to your specific equip ment Remove the T mount 2 adapter from the Alpy guiding module LSshelyak 12 INSTRUMENTS CHAPTER 2 USING THE CALIBRATION MODULE LEE Attach the calibration module to the guiding mo The instrument is now ready for installation on the dule with the four screws included in the package telescope refer to the Alpy 600 and Alpy guiding user guides Position the calibration module in such a way that the black foam on the screen is towards 2 3 During observations the Alpy guiding module and the switches are at the opposite side to the guiding camera Once the Alpy spectroscope including the calibra tion module is installed on the telescope plug in the Firmly tighten the four screws POWer saudalenOckets Attach the T mount 2 adapter to the Alpy cali W
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