![Page 1: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/1.jpg)
MAMMUT for ESO VLT UT’s and VLTI
Dr. Stefano Minardi
Friedrich Schiller University, Jena
Thursday, November 18, 2010
![Page 2: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/2.jpg)
Aperture synthesis via interferometry
Thursday, November 18, 2010
![Page 3: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/3.jpg)
T1T2
T3
T4
T5
T6
Aperture synthesis via interferometry
Thursday, November 18, 2010
![Page 4: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/4.jpg)
T1T2
T3
T4
T5
T6
Aperture synthesis via interferometry
Equivalent Telescope Diameter
Thursday, November 18, 2010
![Page 5: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/5.jpg)
T1T2
T3
T4
T5
T6
Aperture synthesis via interferometry
Equivalent Telescope DiameterProtoplanetary disks
Thursday, November 18, 2010
![Page 6: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/6.jpg)
T1T2
T3
T4
T5
T6
Aperture synthesis via interferometry
Equivalent Telescope Diameter
Binary stars
Protoplanetary disks
Thursday, November 18, 2010
![Page 7: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/7.jpg)
T1T2
T3
T4
T5
T6
Aperture synthesis via interferometry
Equivalent Telescope Diameter Star Photospheric
Images
Binary stars
Protoplanetary disks
Thursday, November 18, 2010
![Page 8: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/8.jpg)
ρ
Beam combiner (“Screen”)Phase
Contrast
A1 A2
Inte
nsity
Principle of interferometry
Thursday, November 18, 2010
![Page 9: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/9.jpg)
ρ
Beam combiner (“Screen”)Phase
Contrast
A1 A2
Inte
nsity
Principle of interferometry
Γ12 (ρ) = A1(t)A2 (t) = I(α,δ )∫ e− i 2π
λ(ρxα +ρyδ )dαdδ
Van Cittert Theorem
Thursday, November 18, 2010
![Page 10: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/10.jpg)
ρ
Beam combiner (“Screen”)Phase
Contrast
A1 A2
Inte
nsity
Principle of interferometry
Γ12 (ρ) = A1(t)A2 (t) = I(α,δ )∫ e− i 2π
λ(ρxα +ρyδ )dαdδ
Van Cittert Theorem
Measurement ofphase and amplitude
of the visibilities is crucial
Thursday, November 18, 2010
![Page 11: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/11.jpg)
Vibrations and interferometers
Interferometric set-ups are extremely sensitive to vibrations of mirrors.
Inte
nsity
Scan coordinate
Thursday, November 18, 2010
![Page 12: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/12.jpg)
Vibrations and interferometers
Interferometric set-ups are extremely sensitive to vibrations of mirrors.
Inte
nsity
Scan coordinate
Thursday, November 18, 2010
![Page 13: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/13.jpg)
Vibrations and interferometers
Interferometric set-ups are extremely sensitive to vibrations of mirrors.
Inte
nsity
Scan coordinate
Thursday, November 18, 2010
![Page 14: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/14.jpg)
Vibrations and interferometers
Interferometric set-ups are extremely sensitive to vibrations of mirrors.
Inte
nsity
Scan coordinateNon-constant phase relationship
= smaller coherence
Γ12 (τ ) = A1(t)A2 (t + τ )
Thursday, November 18, 2010
![Page 15: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/15.jpg)
Vibrations and interferometers
Vibrations faster than detection time:
★ Reduce contrast of fringes.
★ Reduce detection dynamic.
★ Make fringe tracking more difficult.
Interferometric set-ups are extremely sensitive to vibrations of mirrors.
Inte
nsity
Scan coordinateNon-constant phase relationship
= smaller coherence
Γ12 (τ ) = A1(t)A2 (t + τ )
Thursday, November 18, 2010
![Page 16: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/16.jpg)
Motivation: vibrations at VLTI
10 Hz < Vibration frequency <1000 HzThe problem:
* Residual OPD of 400 nm r.m.s. originating in UT’s
* Mirrors M9-20 are monitored by PRIMA metrology.
* Mirrors M1-M8 partially monitored by accelerometers.
* Mirrors M1-M8 are moving to follow the stars.
Lim
it Fr
inge
Tra
ckin
g
Mirror resonances
UT
AT
Thursday, November 18, 2010
![Page 17: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/17.jpg)
The MAMMUT project
MirrorvibrAtion
MetrologysysteM for the Unit
Telescope
MAMMUT is a metrology system for VLTI based on telecom fiber technology designed and developed for ESO.
It mainly addresses the need for:
a) A metrology system accessing the moving parts of the UT.
b) High speed vibration tracking with nanometric accuracy.
Thursday, November 18, 2010
![Page 18: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/18.jpg)
MAMMUT concept
Reference arm
Metrology arm
Active OPD stabilization
250m-long fiber
250m-long fiber LaserSources
External metrology @ 1368 nm
Internal metrology @ 1353 nm
Beacon
Thursday, November 18, 2010
![Page 19: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/19.jpg)
MAMMUT concept
Reference arm
Metrology arm
Active OPD stabilization
250m-long fiber
250m-long fiber LaserSources
External metrology @ 1368 nm
Internal metrology @ 1353 nm
Beacon
Thursday, November 18, 2010
![Page 20: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/20.jpg)
MAMMUT concept
FringeSensorUnit
Reference arm
Metrology arm
Active OPD stabilization
250m-long fiber
250m-long fiber LaserSources
External metrology @ 1368 nm
Internal metrology @ 1353 nm
Beacon
Thursday, November 18, 2010
![Page 21: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/21.jpg)
MAMMUT concept
FringeSensorUnit
Time
OPD
Reference arm
Metrology arm
Active OPD stabilization
250m-long fiber
250m-long fiber LaserSources
External metrology @ 1368 nm
Internal metrology @ 1353 nm
Beacon
Thursday, November 18, 2010
![Page 22: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/22.jpg)
MAMMUT requirements
Frequency response (-3 dB): 1 - 100 HzPure delay: < 100 μs
Resolution: < 1 nm
Linearity: 1%
Range (excluding DC component): ±5 μm
Noise PSD: < 1 nm2/Hz (=10 nm r.m.s.)
Laser wavelength: between 1350nm and 1400 nm
Length of fiber interferometer: 250+250 m
Thursday, November 18, 2010
![Page 23: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/23.jpg)
MAMMUT beacon
•Active phase modulation achieved via fiber-stretchers•Keeps the OPD constant for several hours•Phase noise level is below 20 nm r.m.s.•PSD < 10-1 nm2/Hz
Thursday, November 18, 2010
![Page 24: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/24.jpg)
MAMMUT fringe sensorMeasures the phase from feedback signal
required to track fringes
Automatic phase unwrapping
Phase control via Electro-Optical Modulator
Low noise
1 nm2/Hz
Minardi et al. Astr. Nach. 330, 518 (2009).Spaleniak et al. SPIE 7734-145 (2010).
Thursday, November 18, 2010
![Page 25: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/25.jpg)
MAMMUT fringe sensor
Oscillation pk-pk amplitude of
•Linearity better than 1%
•Range up to 10 μm
•Frequency response >300 Hz
Thursday, November 18, 2010
![Page 26: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/26.jpg)
New directions:
The discrete beam combiner
Thursday, November 18, 2010
![Page 27: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/27.jpg)
Motivation: fast astronomical events
Thursday, November 18, 2010
![Page 28: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/28.jpg)
Motivation: fast astronomical events
Exoplanet transits
Thursday, November 18, 2010
![Page 29: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/29.jpg)
Motivation: fast astronomical events
Exoplanet transits Nova/Supernova explosion
Thursday, November 18, 2010
![Page 30: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/30.jpg)
Motivation: fast astronomical events
Exoplanet transits Nova/Supernova explosion
Require simultaneousbeam combination of many telescopes
Thursday, November 18, 2010
![Page 31: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/31.jpg)
Beyond 4-Telescope Combination
Benisty et al. A&A 498, 601 (2009).
Thursday, November 18, 2010
![Page 32: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/32.jpg)
Beyond 4-Telescope Combination
Benisty et al. A&A 498, 601 (2009).
Thursday, November 18, 2010
![Page 33: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/33.jpg)
Beyond 4-Telescope Combination
Can 3D geometry ease scalability?Benisty et al. A&A 498, 601 (2009).
Thursday, November 18, 2010
![Page 34: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/34.jpg)
The discrete beam combiner
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 35: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/35.jpg)
The discrete beam combiner
2D array ofcoupled
waveguides
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 36: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/36.jpg)
The discrete beam combiner
2D array ofcoupled
waveguides
Field injectionpoints
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 37: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/37.jpg)
The discrete beam combiner
2D array ofcoupled
waveguides
Outputintensity pattern
Field injectionpoints
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 38: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/38.jpg)
The discrete beam combiner
2D array ofcoupled
waveguides
4x4detector
Outputintensity pattern
Field injectionpoints
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 39: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/39.jpg)
The discrete beam combiner
2D array ofcoupled
waveguides
4x4detector
Outputintensity pattern
Field injectionpoints
Complex visibilities over all baselines obtained from linear transformation of output intensities
Minardi, Neuhauser, Pertcsh SPIE 7034-136 (2010).Minardi, Pertsch Opt. Lett. 35, 3009 (2010).
Thursday, November 18, 2010
![Page 40: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/40.jpg)
3x3 DBC performance
Thursday, November 18, 2010
![Page 41: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/41.jpg)
3x3 DBC performance
Thursday, November 18, 2010
![Page 42: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/42.jpg)
3x3 DBC performance
Could reach performance of existing beam combiners
Thursday, November 18, 2010
![Page 43: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/43.jpg)
Conclusions
• Photonic technologies can be profitably used for internal metrology of moving telescopes
• MAMMUT can deliver a stable phase reference with +/-10 nm jitter over
a baseline of up to 500 m
• We have started investigating the potentialof 3D photonics for the combination
of an arbitrary large number of telescopes
Thursday, November 18, 2010
![Page 44: MAMMUT for ESO VLT UT’s and VLTI - astro.uni-jena.de · The MAMMUT project Mirror vibrAtion Metrology systeM for the Unit Telescope MAMMUT is a metrology system for VLTI based on](https://reader030.vdocuments.us/reader030/viewer/2022041222/5e0c064aeea06e4d5e11da9b/html5/thumbnails/44.jpg)
Thanks to ...
Thomas PertschProf. Ralph Neuhauser
Nadya ChakrovaIzabela Spaleniak
Lourdes Patricia Ramirez Frank Giessler
Stephan KraemerArkadi Chipouline
Martin Hohmann
Manfred Rothhardt Martin Becker
Reinhardt Geiss
Thursday, November 18, 2010