Patent ID: 11879832
Assignee: HAHN-SCHICKARD-GESELLSCHAFT FüR ANGEWANDTE FORSCHUNG E.V.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A photoacoustic spectroscope for analyzing gas, comprising:
a modulatable infrared emitter,
an analysis volume that can be filled with gas, and
a sound pressure detector,, wherein the modulatable infrared emitter, the analysis volume, and the sound pressure detector are arranged such that the infrared radiation modulatably emittable from the infrared emitter can excite gas in the analysis volume to form sound pressure waves which are measured using the sound pressure detector,, wherein the sound pressure detector comprises a structure capable of vibrating, an actuator, and a measuring unit, wherein the actuator is configured to actively excite vibration of the structure capable of vibrating and the measuring unit is configured for measuring the vibration properties of the structure capable of vibrating, which measurement depends on the formation of the sound pressure waves, and wherein the modulation frequency of the infrared emitter is between 1 Hz and 200 Hz, while the excitation frequency of the structure capable of vibrating is between 1 kHz and 200 kHz.