Development of clamp-on type thermal mass flow meter using near infrared absorption method for micro flow applications |
|---|
| S. H. Lee, S. Park, W. Kang |
- Abstract:
- We have developed a portable device, based on this infrared absorption method, that can measure in-situ micro flow rates from 0.2 to 20 mL/min using a simple diode laser and a photo detector. A 1450 nm laser absorbed in water was irradiated to form a hot spot and the temperature was measured upstream and downstream of the hot spot. Two diode lasers and two photodetectors were used to measure the water temperature in the tube upstream and downstream of the hot spot. The amount of laser diode light from 1550 nm to 1650 nm wavelength absorbed by the water varied with the temperature of the water. The flow rate was measured by the temperature difference obtained by the diode laser absorption upstream and downstream of the hot spot. The temperature difference measured upstream and downstream decreased exponentially with increasing flow rate. Thus, it was confirmed that the flow rate can be measured through the temperature difference gauged using a simple diode laser set. This method is used for various applications including biomedical and chemical processing without causing any contamination owing to the flow meter installation.
- Download:
- IMEKO-TC9-2019-044.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2019
- Title:
18th International Flow Measurement Conference 2019
- Place:
- Lisbon, PORTUGAL
- Time:
- 26 June 2019 - 28 June 2019