Study of nitro aromatic explosives sensor based on fluorescence quenching

A nitro aromatic explosives sensor based on fluorescence quenching was studied in this paper. U-shaped plastic optical fiber was used as sensor head and light emitting conjugated polymer MEH-PPV as fluorescence indictor. The light source was modulated sinusoidal to eliminate the external light disturbance. TNT quenching characteristics of fluorescence intensity was measured. When TNT concentration is lower than 10 mg/ml, the relationship between fluorescence intensity and TNT concentration is linearly, when TNT concentration is higher than 10 mg/100 ml the obtained characteristics showed deviation from linear relation described by Stern–Volmer equation.