Carbon Dioxide Point Sensor
High-Sensitivity, Fast-Response
Purpose
SDL has developed a field-deployable, compact, highly sensitive, and battery-operated CO2 sensor for atmospheric monitoring. It outperforms the current state-of-the-art instrument (Vaisala Field Check Adapter) in both sensitivity (160 ppm vs 0.5 ppm) and measurement response time (20 sec vs 250 msec).
Concept of Operation
Wavelength modulation spectroscopy
- Modulate a 2μm, SLM, VCSEL at 10 kHz for lock-in detection
- Sample through a Herriott configured multi-pass cell
- Detect with InGaAs detector
- Convert signal to ppm vs. time using CO2 calibration curve
- Transmit data wirelessly from sensor to laptop controller
Performance Specifications
| Parameters | CO2 sensors |
|---|---|
| Laser Frequency | 2 μm |
| Sensitivity | < 540 ppb |
| Measurement Response Time | 250 ms |
| Optical Path-length | 3.5 m width /11.4 cm cavity length |
| Dimensions | 23.9 x 16 x 8.9 cm |
| Wireless Transmission Range | 45 m (indoor), 124 m (outdoor) |
| Weight | < 4 lbs |
| Battery Pack/Battery Life | 3.7 V, 10 amps, Li-ion; 20 hrs 1695 North |
