Patent ID: 11921070
Assignee: CARL ZEISS AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A measuring method for measuring a measured variable on the basis of an NV center which has a plurality of quantum states and is also optically excitable into at least one excited state of the quantum states by means of an excitation light depending on an occupation of one of the quantum states, wherein the at least one excited state decays with emission of emission light of the NV center, wherein the measuring method comprises:
irradiating the NV center with the excitation light, wherein the excitation light has a temporally periodic modulation and wherein a respective occupation probability and/or a respective lifetime of the quantum states are/is dependent on the measured variable and the excitation light;
determining a phase shift between the emission light of the NV center and the modulation of the excitation light; and
determining a measured value for the measured variable on the basis of the phase shift.