A miniaturized thermal desorption unit for chemical sensing below odor threshold

We present a thermal desorption unit with features designed for use with chemical sensors to enhance sensitivity and selectivity. A novel method is used to measure and empirically describe influences on breakthrough characteristics. A fast heating technique and low dead volume result in sharp desorption peaks (approx. 0.53 ml). Enrichment factors of more than 100-fold allow for detection of odorous substances below their odor threshold.