| Launch：2022-06-28 |
Raman spectroscopy as a non-destructive rapid detection technology, in the pigment identification is "great magic", speaking of garcinia, which is a commonly used plant dye in Chinese painting, author consulted the literature and found that the yellow dye on the wooden painting unearthed from the tombs of the Tang Dynasty in Astana is the earliest known use of garcinia dye in China, and the identification of pigments used in ancient paintings is undoubtedly of great significance to the restoration of ancient paintings. However, when using Raman spectroscopy to identify Garcinia cambogia dyes, it is difficult to measure their Raman signal, especially when thin coated on paper.
Recently, we have tested the plant dye Garcinia cambogia. We tested Garcinia flaks of pigment using a 785 nm excitation wavelength. To avoid sample damage, we only used 50 mw of laser power, 0.5s integration time. Although the sample was not burned and damaged, it is clear that, as shown in the figure below, the fluorescence interference is severe, with only a small 1595cm-1 peak.
To circumvent fluorescence interference, test the Garcinia flax pigment block again using our PR1064 Raman spectrometer. As shown in Figure 2, the PR1064 Raman spectrometer's ability to avoid fluorescence interference is still very good.
We also tested the Garcinia cambogia pigment coated on the paper, as shown in Fig. 3. The Raman spectrum of Garcinia cambogia was also measured, and the Garcinia cambogia dye on the paper was tested several times at 30-50mw "low power mode". The sample did not suffer any burning damage. The Raman spectrum of Garcinia cambogia was measured.
1064nm Raman spectrometer "low power" mode
Today we're going to demonstrate more than just PR1064nm's fluorescence-circumvention capabilities. Typically, the 1064 Raman Spectrometer requires a longer integration time and higher power when testing samples. For some dark samples or flammable samples, it is easy to be damaged at higher power. However, pay attention to our test parameters. The signal can be measured only at 30-50mw laser power and 5s-20s integration time. The samples tested are intact. This "low power mode" not only effectively avoids sample damage, but also obtains the Raman characteristic peak position information of the sample.
Old calligraphy and paintings have been handed down to this day, and it is easy to be damaged and faded. Recently, the author tested pigments and also had the privilege of learning about a profession that crossed time and space to dialogue with the ancients - "painting medicine". In addition to marveling at its transformation of decay into magical skills, it is also praised by scientific researchers who want to pay silently for the restoration of ancient paintings. Together, they used scientific protection to make these ancient paintings "prolong their lives". It is an honor that we can also contribute our part.
1.High sensitivity and signal-to-noise ratio: 1s integration time can obtain high-quality signals with signal-to-noise ratio of more than 300:1;
2. Wide integration time: the integration time can be set from 1ms to 60s;
3. High stability: peak fluctuation RMS<1% @2hrs;
4. High resolution: compared with similar products, the optimized optical path design and 512pixels can provide a resolution of 15-18cm-1;
