Dimma a completely unmanned differential image motion monitor
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DIMMA: a completely unmanned Differential Image Motion Monitor. A.M. Varela (1) , L.F. Rodríguez-Ramos (1) , C. Muñoz-Tuñón (1) & M. Sosa (2). (1) Instituto de Astrofísica de Canarias, Spain (2) Inerza, S.A., Spain. Site Selection for the European Extremely Large Telescope

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Dimma a completely unmanned differential image motion monitor

DIMMA: a completely unmanned Differential Image Motion Monitor

A.M. Varela(1), L.F. Rodríguez-Ramos (1), C. Muñoz-Tuñón (1) & M. Sosa (2)

(1) Instituto de Astrofísica de Canarias, Spain

(2) Inerza, S.A., Spain

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

Site Selection for the European

Extremely Large Telescope

http://www.eso.org/project/e-elt/

Backaskög, Suecia

ELT Design Study, WP12000, Site Characterization

J. Vernin, C. Muñoz-Tuñon, M. Sarazin

Scope of WP12000

This WP covers the characterization of few sites for what concerns the seeing, ground climatology, atmospheric properties, [soil and seismicity].

Emphasis is put on already existing astronomical sites and on new physics corresponding to such a large telescope. The final report will help to select the best reasonable place to settle the ELT.

Tenerife, March 26-29, 2007


Parameters and tools

  • Structure of the Atmospheric Turbulence (+/- 500 m up to ca. 20km).

  • SCIDAR (Fuensalida et al..Avila et al..)//

  • SLODAR (Wilson, Sarazin… // MASS

  • Humidity and precipitable water vapour

  • Satellites (Varela et al…)// Climate diagnostic archives

  • Wind speed and direction, vertical profile in the BL

  • Climate diagnostic archives // SCIDAR // SODAR//AWS

  • Sodium layer density and height

  • Ground deformations and seismicity

  • Seeing or atmospheric coherence length.

  • DIMM, MASS,MASS-DIMM, SCIDAR, GSM, DIMMA

  • Airborne aerosols and properties…

  • Airborne particles counter//MFRSR//LIDAR //Satellites

  • Cloudiness, fog, and dust

  • Atmospheric extinction

  • Long-term meteorological parameters

Satellites vs in situ tecnhiques

Parameters and Tools

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

SEEING or atmospheric coherence length

Differential Image Motion Monitor–DIMM-full atmospheric seeing (but the SL) with accurate < 0.1”1data/minuteaccurate, absolute and reproducible data; control tests are however important, see e.g. Tokovinin, 2003, Varela etal, 2003)

Sarazin & Roddier, 1990, A&A, 227, 294. (ESO DIMM)

Vernin & Muñoz-Tuñón, 1995, PASP, 107, 265 (DA/IAC DIMM)

http://www.iac.es/project/sitesting/site.html

http://www.eso.org.com

MASS

Free atmosphere seeing (“) , resolution?

5 atmospheric slabs from 1-16km.The 2 smallest MASS

apertures can be conjugated to a negative altitude of –0.5 or –1km.

Monitoring campaigns

http://www.ctio.noao.edu/atokovinin/profiler/principle.html

MASS-DIMM

Full atmospheric seeing seeing. Resolution <0.1”

Monitoring campaigns

Tokovinin, NOAO-NSO Newsletter, Issue 77, 32-34, 2004

http://mass.ctio.noao.edu

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

Maidanak

ORM (La Palma)

OT (Tenerife)

La Silla

Happy Jack (4)

Sierra Nevada

Calar Alto

San Pedro Mártir

Arecibo (9.2)

Sierra la Negra

Oukaimeden

Mauna Kea

Paranal

Las Campanas (2x6.5, 25.3)

Cerro Tololo

Cerro Pachon (4.2)

Antarctica (25.3, 50...)

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

Ground (in situ)

Air temperature 0.30-0.55ºC

Soil and Subsoil Temp. “

Barometric Pressure 0.3mB

Vapour pressure

Relative Humidity 2%

Wind Speed 0.3m/s for ws>3m/s

Gusts 3% for ws>3m/s

Wind direction 2%

Rainfall 1%

LONG-TERM METEOROLOGY

Automatic Weather Stations

GTC site-testing campaign: meteorologyT. Mahoney, C. Muñoz-Tuñón, and A.M. Varela.

New Astronomy Reviews 42 (1998) 417-424

Climatic Diagnostic Archives (NCEP/NCAR), Balloons.

http://www.cdc.noaa.gov

Remote Sensing

Climate diagnostic archives: an approach to ELT site selectionB.García-Lorenzo, Fuensalida, J.J., Mendizabal, E.G., Muñoz-Tuñón, C.,

& Varela, A. SPIE, 5572, 68(2005)

Tenerife, March 26-29, 2007


Observing strategy

DIMM & 1 observer: (till full automatization :DIMMA)

Seeing measurements 10-12 nights/month (in alternative weeks) from the last 15 years.

Sample rate 1 data / 30 s. Precision better than 0.1 arcsec.

Automatic Weather Station

Meteorological parameters continously.

Sample rate 1 data / minute.

OBSERVING STRATEGY

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

OT (Tenerife)

ORM (La Palma)

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

http://www.iac.es/project/sitesting/site.html

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

ORM:

Several DIMMS,

MASS-DIMM

DIMM(A)

OT:

DIMM, MASS-DIMM

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

DIMMA: the IAC automated DIMM

  • DIMMA: Conceptual Design.

  • Rodríguez, Varela & Muñoz-Tuñón, 2004

  • The DIMMA.

  • Muñoz-Tuñón, Varela & Rodríguez, 2004

  • 1er Encuentro Astronomía Robótica, Madrid.

  • Completely automatic. No operator needed.

  • Using ideas and previous developments of earlier DIMMs.

  • Completely outsourced, if possible.

  • Use as many commercial off the shelf products as possible

  • Designed to be copied about a dozen times

  • To be placed in remote sites, with no infrastructure at all.

  • Powered using only photovoltaic solar energy

  • Capable of storing all relevant data, including housekeeping, seeing and weather

  • Featuring a built in software data quality checking module.

  • Self-protection incorporated.

Tenerife, March 26-29, 2007


Dimm versions

RoboDIMM (ING, CTIO, ....)

HDIMM (CARA)

ADIMM (Automated DIMM-Oukaïmeden)

ADIMM (Antarctica DIMM-JACARA)

MASS-DIMM (automatic...Chile, SPM, ...)

Etc.

DIMM VERSIONS

NOMENCLATURE??

BUT:

  • Weather checking (if yes, not yet able cloud and/or rain detection)

  • Dome closing and opening

  • Power supply

  • Risks evaluation

  • Quality control of the data

  • Etc.

Tenerife, March 26-29, 2007


Dimma objetives

Automatic Operation (pointing, tracking, selection and search of stars,...seeing calculation)

Operation in isolated sites.

Self-protection system. Evaluation of risks:

Extreme weather conditions (winds, clouds, rain, gust, humidity, dust...)

every 1 minute

Break-down of sensors

Unloading of the batteries

Space on hard disk

Intruders presence, ...

DIMMA OBJETIVES

Tenerife, March 26-29, 2007


Block diagram

BLOCK DIAGRAM

C8”

ST-237 de Sta. Barbara Instruments: 657x495 pixels de 7.4x7.4 μm.

Tenerife, March 26-29, 2007


Main characteristics

MAIN CHARACTERISTICS

  • Automatic point with less than 1 arc minute accuracy.

  • Automatic focusing with two independent systems.

  • Automatic dome opening and closing.

  • Automatic weather station integrated within the control system.

  • Web cameras for remote monitoring

  • Multisensor integration for robotic control

  • Database storage of both scientific and housekeeping data

  • Data quality checking (fwhml/fwhmt, focus, saturation, ….)

  • Wireless linked to the Ethernet

  • Powered by solar panels (7.7 m2) plus batteries (2x450 Ah).

Tenerife, March 26-29, 2007


Status of the dimma

DIMMA was developed by INERZA, S.A. (Gran Canaria, Spain) under contract by IAC.

STATUS OF THE DIMMA

Astro-Haven Dome

12m-Mast

Residence

DAU

5m-tower

Solar Pannels

  • In June 2006 has started the DIMMA installation at the ORM at Las Lajitas.

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

Tenerife, March 26-29, 2007


Dimma interface

DIMMA INTERFACE

Tenerife, March 26-29, 2007


Dimma a completely unmanned differential image motion monitor

  • The DIMMA is now under calibration and validation process and will be fully

  • operative in spring 2007.

Tenerife, March 26-29, 2007


Future works

Comparison DIMMA vs DIMM, RoboDIMM, SCIDAR y MASS-DIMM.

DIMMA will be a reference for the MASS-DIMM (E-ELT FP6 site testing campaign)

Second DIMMA will be installed in the next april 2007 at the Teide Observatory (site seeing on Thursday...?)

Future Works

More information: www.iac.es/project/sitesting/site.html

www.inerza.com

Tenerife, March 26-29, 2007


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