Entanglement Technologies, Inc. Entanglement Technologies manufactures thermal desorption, cavity ringdown spectroscopy (TD-CRDS) analyzers used to measure VOCs in ambient air and other complex matrices. Our flagship product, AROMA-VOC, measures BTEX, ethylene oxide, trichloroethylene, and more at part-per-trillion detection limits from the back of any vehicle or at long-term unattended monitoring sites.