Transportable automated ammonia sensor based on a pulsed thermoelectrically cooled quantum-cascade distributed feedback laser.
A compact ammonia sensor based on a 10-microm single-frequency, thermoelectrically cooled, pulsed quantum-cascade laser with an embedded distributed feedback structure has been developed. To measure NH3 concentrations, we scanned the laser over two absorption lines of its fundamental v2 band. A sensitivity of better than 0.3 parts per million was achieved with just a 1-m optical path length. The sensor is computer controlled and automated to monitor NH3 concentrations continuously for extended periods of time and to store data in the computer memory.
Kosterev
Anatoliy A
AA
Rice Quantum Institute, Rice University, Houston, Texas 77251-1892, USA. akoster@rice.edu
Curl
Robert F
RF
Tittel
Frank K
FK
Köhler
Rüdeger
R
Gmachl
Claire
C
Capasso
Federico
F
Sivco
Deborah L
DL
Cho
Alfred Y
AY
D000641:Ammonia / Q000032:analysis*; D019149:Bioreactors; D004784:Environmental Monitoring / Q000295:instrumentation*; D004867:Equipment Design; D007834:Lasers; D011789:Quantum Theory; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*
D000641:Ammonia