We are proud to offer a special member in our line of Advanced Gem Testing Instruments.
The GL Gem SpectrometerTM NIR PL405 is a dual purpose research spectrometer for photo luminescence (PL) studies; with the included GL Halogen Gem Holder it can be used for VIS-NIR spectroscopy (550 – 1,000 nm) as well but will not display the Cape lines of diamonds which are important for diamond characterization. The spectrometer can be operated from the USB port of a laptop computer. No additional drivers are necessary; the easy to learn GLGemSpec software displays both absorbance and transmittance spectra in real-time.
The spectrometer has a higher resolution (but a smaller wavelength range 550 – 1,000 nm) than the original GL Gem Spectrometer (300 – 1,000 nm) , a built-in Long Wave Pass Filter (LWPF) and is optimized for the NIR range.
It allows identification of many gemstones such as ruby, sapphire, emerald, spinel, alexandrite, etc. based on their PL response alone and is an efficient tool for quick diamond testing; it will detect the GR1 center for irradiated diamonds and the Si center often seen in CVD grown diamonds – in some cases without LN cooling.
It can be used in addition to the GL Gem Spectrometer or on its own as a dedicated PL and transmission spectrometer as many gem materials have important features in the VIS-NIR range. For instance it will identify untreated jadeite (it will not show the PL band for polymer treated jade due to the built-in LWP filter). Diamond irradiation, copper content in “Paraiba” tourmaline will be visible in the spectrum. First studies indicate that heat treatments such as in red spinel can be determined.
In PL mode it is almost as sensitive as the GL Gem Raman PL532 and can serve as a low-cost PL spectrometer.
- Fluorescence Spectroscopy of Minerals (PDF) by Robert Fosbury
- Detection of defects in minerals by luminescence spectroscopy (PDF) – PPP by Jens Goetze
- Online Database of Luminescent minerals with numerous gemstone reference spectra
- How to Obtain a Spectrum with the GLGemSpec – (video, no sound – window will pop up) synthetic (flame fusion) ruby
- How to Edit a GLGemSpec Spectrum in Spekwin32 – (video, no sound – window will pop up) green sapphire (Pailin, unheated)
- Le Spectrometre UV-VIS-NIR GLGemSpec (PDF) – A presentation by Claude Lamarre, G.J., F.G.A., M.V. (in French)
Photoluminescence studies with low-cost spectrometers is a relatively new application; the supplied spectra show initial results of our work and are based on disclosure by the owner of the sample..
Gemlab R&T Development and Support Team
- J Wolf Kuehn, B.A., M.A., PDP (SFU), Dipl.oec, F.G.G. – GLR&T Project Manager, Vancouver, B.C., Canada
- Stanislav O Konorov, Ph.D. (Laser Physics), Senior Scientific Assistant, Dept. of Chemistry, University of Victoria, B.C., Canada
- Matthew Stockinger, B.A. (Chemistry, Mathematics), M.S. (Teaching), St. Cloud, MN, USA
- Jean-Marie Dereppe, Ph.D. (Professor Emeritus, Physical Chemistry Department), University of Louvain, Belgium
Specifications of the GL Gem Spectrometer NIR PL405
- Weight: 510 grams Dimensions: 170 mm x 100 mm x 50 mm
- Detector: Toshiba TCD1304DG linear array
- Detector range: 550 – 1000 nm Pixels: 3648 Pixel size: 8 um x 200 um
- Signal-to-noise ratio: 500:1 A/D resolution:16 bit; onboard averaging; better S/N above 200 ms
- Fiber optic connector: SMA 905 to 0.22 numerical aperture single-strand optical fiber
- Wavelength and Optical resolution: 550-1000 nm < 1 nm
- Exposure time: 2.5 ms-10 s CCD reading time: 14 ms Data transfer speed: 200 ms / 100 ms (2 points binding)
- Power consumption: 200mA @ 5V from computer interface: USB 2.0, HID 2.0 (USB cable included)
- Operational system: Windows XP/Vista/Windows 7/8/10 32/64 bit and others; with proprietary firmware for GL Halogen 10W Gem Holder
We have fine-tuned the hardware and software of the GL Gem Spectrometer which has over 200 users world-wide; starting with the 2013 model we use a new sensor which will improve signal sensitivity.
Portable GL Gem Spectrometer NIR PL405 System with GL Halogen 10W Gem Holder (included)
Please request pro forma invoice for shipping options outside North America. All wire transfers must follow FINTRAC Guidelines (will be provided in the pro forma invoice) or they will be rejected.
NEW for 2016 PRICE US$ 1,695.00; this unit must be pre-ordered (lead time 3 – 4 weeks)
For your own protection always use laser safety goggles when operating any type of laser equipment.
For work with larger samples and gems set in jewellery we recommend the GL Xenon Flashlight setup (see image) and/or the GL Fiber Probe with diffuser which can be purchased separately.
Using a fiber probe with the GL Gem Spectrometer requires a customized setup with external lighting and will change several parameters for obtaining a spectrum.
Results may vary dependent on light source and its position, sample size (affecting path length) and orientation, etc.; spectra will look different from those found in the database and/or obtained with the GL 10W Halogen Gem Holder.
Specifications of the GL Halogen Gem Holder
|GL Halogen 5/10W Gem Holder with built-in cosine corrector, 20 x 20 mm opening and cooling fan. Similar to an integration sphere the built-in halogen light source is internally diffused by the holder’s black matte finish.This unit is included in the basic GL Gem Spectrometer™ package.
This light holder has been optimized for the VIS-NIR 400 – 950 nm range; with the additional diffuser adapter other light sources such as UV LED, Xenon flashlights, etc. can be used.
The GL Halogen 5/10W Gem Holder is an exclusive design of Gemlab Research & Technology and is protected by copyright laws.
|The GL Gem Spectrometer™ requires a computer with a USB port (no separate drivers necessary, USB 2.0/HID 1.0 compliant).The software package contains the GLGemSpec program (Windows XP/Vista/Win 7/8/10 for 32/64 bit); for developers the VIs and a runtime package for LabVIEW 2009 are included.
A single user license is provided for each GL Gem Spectrometer system; the software works only with the modified firmware of the GL Gem Spectrometer.
Users of the GLGemSpec system have access to the Gemlab R & T spectra database which is available on-line
Our Warranty and Commitment
The GL Gem Spectrometer™ is an advanced gem testing instrument for users who have a good understanding of spectroscopy and should be familiar with the use of a traditional gemmological spectroscope and the interpretation of spectra. The instrument is not capable of identifying or naming a sample; it should be used with other gem testing tools before arriving at a conclusion.
If you are not satisfied with the performance of the spectrometer we will accept returns within 10 days but have to charge a restocking fee of 10% to cover our expenses of shipping/handling and recalibration if necessary. The purchaser is also responsible for the shipping and insurance to Vancouver, Canada. We will repair and replace your GL Gem Spectrometer if necessary due to defective parts, etc during the first 6 months unless other consumer protection regulations exist in your country.
We also offer firmware/CCD upgrades for a processing fee of US$ 495 which covers the update, new software, re-alignment and re-calibration, etc. and return shipping charges; other repair services upon request. Software updates are always free.
Photoluminescence Spectra (non-polarized)
This page is still under development. Photoluminescence studies with low-cost spectrometers is a relatively new application; the supplied spectra show initial results of our work and are based on disclosures by the owner of the samples.
Diamond Characterization (spectra obtained with the GL Gem Spectrometer NIR PL405)
PL (405 nm blue laser excitation) at room temperature
Absorption (GL Gem Halogen Light)
Corundum PL Characterization (blue laser excitation)
Above PL spectra edited in Spekwin32.
Jadeite PL Characterization (blue laser excitation)
About This Project
The GL Gem Spectrometer™ system has been under development for several years. My interest in spectroscopy goes back to Bill Hannemann’s book “Video-Spectroscopy: 21st Century Gemology” published in 1988. With 2 years of university physics in my academic background I was intrigued by Bill’s concept and saw its potential but Video Spectroscopy never took off the ground.
Almost 20 years later I started using an Ocean Optics USB 2000 (200 – 850 nm) spectrometer for research in the UV range and a NIR 256-2.5 spectrometer for IR studies – but I must admit that the GL Gem Spectrometer has replaced both; it is being used every day in the Gemlab Research & Technology lab and during courses I teach at the Canadian Institute of Gemmology (C.I.G.).
The maker of the spectrometer is a post-doctoral research scientist working at a local university lab facility; he is internationally acclaimed for his work and long list of publications about transmission and Raman spectroscopy (in particular its application in stem cell research).
I would like to thank Dr. Bill Hanneman for including the GL Gem Spectrometer in his book “Pragmatic Spectroscopy for Gemologists” with many reference spectra obtained from his own collection of gems; a copy of the 2nd edition is included with the purchase of each GLGemSpec system.
|The GL Gem SpectrometerTM can be used in LabVIEW environment; VIs provided for developers.|
Wolf Kuehn, B.A., M.A., PDP (S.F.U.), Dipl.oec, F.G.G. – GLR&T Project Manager
© 2015 Gemlab Research & Technology, Vancouver, Canada – www.gemlab.ws