▎ 摘　　要

NOVELTY - The device has a graphene film quartz tuning fork (2) whose one end electrode is connected with a detecting circuit (2). The other end of an electrode is connected to a digital-phase-locked amplifier. The graphene-coated quartz-tuning fork adsorbs the gas to be tested through the graphene film on the quartz-toning fork to change the quality of the graphene coated quartz-titanium tuning fork and the resonance frequency. An upper computer (5) is used to set the sine wave frequency scanning range of digital lock phase amplifier (4) and generates a sine-wave signal with periodically changing frequency in the scanning range. The digital lock-phase amplifier is used for performing phase-locked demodulation on the amplified piezoelectric signal. The upper computer is used for processing the piezolectric signal after the phase-lock demodulating to obtain the gas concentration of the gas to be detected. USE - Gas detecting device in industrial process and biomedicine field. ADVANTAGE - The graphene and derivatives have excellent absorption to the characteristic gas, at the same time, the quartz tuning fork Q value is very high, it can well reflect the gas concentration quantitative information on the frequency deviation. The device has simple peripheral circuit, small volume, low power consumption, and it can ensure good detection sensitivity. It does not need expensive and large light source as the excitation source, it do not need complex and cost beam collimation, the cost is low, the operation is simple, and the multi-point remote detection of different gases can be finished by the graphene coated quartz tuned fork connected in parallel with different tectorial membranes and frequency response characteristics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for detecting gas based on graphene film-coated quartz tuning fork. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the gas detection device based on graphene film quartz tuning fork (Drawing includes non-English language text).