cience

This campaign was organized between 16.06.2015 and 25.06.2015. Using the ART4ART mobile laboratory, the INOE 2000 team conducted a series of investigations in order to characterize and monitor the components of the "Calea Eroilor" Ensemble from Targu Jiu, Gorj County.

Microclimate monitoring

Microclimate monitoring was dictated by the working conditions and the public visiting schedule. Temperature and relative humidity were monitored during the investigations conducted on the "Poarta Sarutului". The sensor used was position on a sculpted bench near the monument.

Control of the temperature distribution for thermic stress evaluation

Thermographic analysis shows the extreme temperatures of the material, the temperature dynamic, but also its distribution on large surfaces, emphasizing the exceed of the allowed thresholds and the thermodynamic balancing speed.

Primary monitoring on an interval of 15 hours revealed the following information:

• - thermic stress appears when the temperature distribution on the surface of the object is not uniform or when there are sudden temperature variation
• - the images were acquired once in one hour between 08:00 and 22:30, each day, on each face of the monument
• - due to the lead ontop of the monument, this area shows a fast temperature growth and a much slower cooling

Ground Penetrating Radar

This technique was used for two different kind of investigations near the "Poarta Sarutului" monument: vertical investigation of the columns (no contact) and ground investigation near the monument. For vertical investigation was used the 800 MHz antenna with a 40 ns time window for a penetration depth of 2m. In the proximity of the monument was investigated with the 800 MHz antenna with a 80 ns time window for a penetration depth of 4m.

Emissivity

The emissivity of the surface of a material is its effectiveness in mitting energy as thermal radiation.

In prezentul raport sunt prezentate inregistrarile prin microscopie optica pentru o serie de limitata de puncte, alese astfel incat sa cuprinda o varietate cat mai cuprinzatoare din particularitatile materialului (cuiburi de oxizi, aglomerari, inomogenitati etc.). Selectia a fost facuta pentru a prezenta posibilitatile de achizitie si de coroborare a datelor (colorimetri, emisivitate, microscopie- in aceatsa prima etapa), care sa fie analizate de geolog si restaurator, ulterior adaptata cerintelor lor. Mentionam ca datele se pot acumula treptat in mai multe campanii, ajungand sa completeze intreaga suprafata cercetata. Pentru achizitia acestui set de date este, de asemenea, necesara schela.

Sintetic, putem imediat observa variatiile de emisivitate si de culoare (ΔE) pentru cele 12 puncte.

Multispectral imaging

Aceasta analiza este cea va permite cea mai rapida si comoda analiza comparata cu rapoartele geologilor (de exemplu studiul cu releveele mai vechi si cu eventuale documentatii fotografice). Analiza a fost efectuata in 3 puncte, la diferite mariri, conform Anexei 2. In figura 12 este prezentat ilustrata una dintre imaginile achizitionate, pentru latura de sud.

Spectroscopy

The spectroscopic analysis: it included analysis of elemental chemical characterization of material blocks (in various cases, they were made on several points of interest). These are extremely useful results for studying the degrading mechanisms, for choosing materials in case of an intervention (restoration, maintenance, protection), they are essential in setting the “print” of the material, which are appealed in critical and unwanted situations of vandalism with severe consequences, etc. The compatibility of possible addition materials can be evaluated in the projection stage of any intervention. The spectroscopic analysis are also performed on several pieces from House Ganescu’s garden, in this case it delivers the necessary “print” for the inventory and the identification of the pieces.

3D Laser scanning

There were 17 recordings from the ground, 2 on top of the monument and 4 recordings from scaffoldings at medium height. The results of the scanning was around 40GB of raw data. Angular scanning resolution was between 150 and 170 lines per degree (for ground and medium height recordings), respectively 60 lines per degree (on top of the monument), resulting a digital model with 3.097.828 vertexes, 18.584.665 edges and 6.195.555 facets.

Laser Doppler Vibrometry

As an external source for excitation was used a speaker with a chirp white noise signal at 100 dB. Excitation band was between 0.01 - 1500KHz with a high pass filter at 100Hz and a rectangular detection window. The scanning grid had a spatial resolution of ~1cm. There were made six recordings, each containing minimum 2000 points.

Expected results