OFCEAS TECHNOLOGY The ProCeasproduct line relies on OFCEAS (Optical Feedback Cavity Enhanced Absorption Spectroscopy) technology developed and patented by the Université Joseph Fourier of Grenoble (France). - OFCEAS technology is a laser spectroscopy; it uses a laser as a source of light to probe a sample. The laser can be tuned to cover a spectral region for the identification and quantitative analysis of a samples contents. - OFCEAS relies on a continuous laser(not a pulsed laser), with a major improvement of wavelengh accuracy and reproducibility for increased reliability of the measurement. - OFCEAS most unique feature is its principle of "FEEDBACK". Proprietary controlled laser feedback technology yields extremely narrow emission rays of light at specific wavelength. Extremely high spectral result from this unique technology -ProCeas is the fastest, most selective and highest spectral resolution product on the market today. ProCeas is robust, easy to install and use; it doesn’t require routine maintenance, resulting in lowered operation costs. ProCeas’ patented low pressure sampling system eliminates the need for a heated gas transfer line between the sampling point and the analyzer. The ProCeasproduct line has numerous advantages: - Lower purchase cost - Excellent compositional representativity of the sample - Reduced maintenance - Reduced operating costs - Predictable maintenance - Response Time < 1 second - No false positive responses - High selectivity - Enables measuring range from the ppt to the ppm using a single calibration - Simultaneous measurement of several gases using the same laser spectrometer - Robustness - Easy to install https://www.linkedin.com/pub/brian-gilmore/4/705/238

1. AP2E
FRANCE
Direct SO3 measurement with the
ProCEAS Cavity Enhanced Spectrometer

2. SO3
OFCEAS
(Hyper-reflective gas cell mirrors reflectivity`99.999%)

3. MEASUREMENT ADVANTAGES
SO3
(Same energy emission becomes concentrated in narrower
band- Governed by Lavoisier’s Law of Energy Conservation)
No Feedback
Bandwidth 1 MHz
Intensity 1X
Feedback
Bandwidth 10 kHz
Intensity 10X

4. SO3
MEASUREMENT ADVANTAGES
200 pt high resolution spectrum
(1500 nm source used as example)
Direct measurement
actual optical
resolution

5. SO3
MEASUREMENT ADVANTAGES

6. SO3
MEASUREMENT ADVANTAGES
Actual 11 day accuracy and drift tests results
comparing w/ GC for sample gas CH4 shown
Results show 20ppb or 1% drift over 11 days
compared w/ reference GC recalibrated every
30 mins
(References: Romanani et al. report to
Atmospheric Stations Instrumentation
Workshop 2008; Chappellaz report at
NEEM Gas Consortium Meeting
Copenhagen 2009)

7. SO3
UNIQUE SAMPLING METHOD
Reduced pressure sampling probe w/
sonic velocity nozzle
Supports accelerated sample transport
times; typical – 5 seconds for every 3
meters (@ 0.2 scfm flow rate)
Low flow (typically 0.11-0.33 scfh)
allows for low cost precision vacuum
pump. Sample line only ~ 4mm ID

8. SO3
UNIQUE SAMPLING METHOD
100 meter sample line on post combustion SCR outlet has
been demonstrated with conditions of sample pt. temp
~200 deg C, 15% H2O by Vol and using UNHEATED line
Thermodynamic sampling conditions at the actual sampling point are
effectively moved to more advantageous conditions for sampling.

9. SO3
UNIQUE SAMPLING METHOD
The diagram shows how
absorption peak selectivity can
clearly be manipulated with
sample line vacuum pressure
Diagram reference: as
reported by authors
Lonigro & Lanher at
IFPAC 2010 Baltimore

10. SO3
DIRECT SO3 MEASUREMENT
SO3
H2O

11. SO3
H2O effects
selectively
removed

12. PUTTING IT ALL TOGETHER
SO3
TDLAS – Tunable Diode Laser Absorption Spectroscopy; CRDS – Cavity Ring Down Spectroscopy

13. SO3
Direct SO3 measurement with the
ProCEAS Cavity Enhanced
Spectrometer