This paper reports nearly shot-noise limited detection of OH us-ing the technique of laser-induced -.fUioxesence.. -A LIDAR-configuration.: :."?. ~. _ is used to excite fluorescence'in-a~ large volume'and a/narrow-bandwidth -• -\i-.-n; •: •"interference filter provides spectral discrimination. This arrangement •alleviates" the" effect of ozonen'inteT?fer-enc&?andrfacilitatespimagerprocess-~.^r f,-(.--,'--. _ --i iag. at relatively close distance^. ^TheIde:tec-tionUAmitiis;determined

more »

... .v by the shot-noise of the solar background. Ground-based measurements in /-O Dearborn indicate a detection limit of better.than 1.x.10 OH/cm over.a. forty-minute acquisition periodr "-Under favorable-conditions-, a comparable -r 'detection limit was also observed^for^ffirborne• measurements?"-0 -^y -.^->r^ -.-,".-" v -Donovan M. Bakalyar is with the:;