Antiresonant hollow-core fiber assisted photothermal spectroscopy for the detection of ammonia in human breath

Abstract

• A nodeless five-ring nested antiresonant hollow-core fiber gas sensor is proposed. • The gas sensor suitable for the concentration of human exhaled NH3 in the near infrared band. • The sensitivity of the sensor is 1827.07 W/(m2⋅ppm) is by the photothermal spectroscopy. We propose a nodeless antiresonant hollow core fiber structure composed of five nested loops to detect the ammonia concentration of human body exhaled at 1527 nm in the near infrared. Based on the photothermal spectroscopy theory, the detection sensitivity of 1827.07 W/(m 2 ∙ppm) is obtained by simulating the detection of ammonia content within 5 s of breathing of different people, which divides the detection range of healthy people and patients with renal failure. Within the ±4.4 % tolerance allowed by optical fiber manufacturing, the sensor sensitivity error is only 0.82 %. The results of simulation theory are of great significance to the detection and prevention of human-related diseases.