Method for the spatially distributed and/or remote measurement of at least one physical quantity, preferably an expansion, oscillation or temperature, in technical-engineering constructions by using optical signals that are backscattered from at least one fiber-optic cable, wherein the method comprises the following steps: • a code generator generates a digital electrical modulation signal as a sequence of a certain number of pulses of the same amplitude with different lengths, wherein, with the help of an HF modulator, the sequence is supplied to a light source for the purpose of generating a modulated laser light for launching of this laser light into the at least one fiber-optic cable, • the modulation signal generated by the code generator is supplied to an evaluation unit, in which the modulation signal is delayed n times by n buffer memories which create a certain time delay, • the optical signal which is backscattered from the at least one fiber-optic cable and contains properties of locations that are distributed across the measuring distance is supplied to a photodiode, in which the optical signal is transformed into a broadband electric signal, - the electrical signal is amplified, filtered and supplied to an A/D converter and transcribed into a broadband digital response signal, • the digital response signal is supplied to the evaluation unit, which at least comprises - the n buffer memories and n correlation stages and n output buffers, - the digital response signal is correlated n times with the delayed modulation signal from the buffer memories for the purpose of creating measurement data sets of the individual locations, - the measurement data is transferred to an evaluation computer for performing an evaluation directly or via a buffer memory for the purpose of creating and outputting spatially resolved measurement values. • a code generator generates a digital electrical modulation signal as a sequence of a certain number of pulses of the same amplitude with different lengths, wherein, with the help of an HF modulator, the sequence is supplied to a light source for the purpose of generating a modulated laser light for launching of this laser light into the at least one fiber-optic cable, • the modulation signal generated by the code generator is supplied to an evaluation unit, in which the modulation signal is delayed n times by n buffer memories which create a certain time delay, • the optical signal which is backscattered from the at least one fiber-optic cable and contains properties of locations that are distributed across the measuring distance is supplied to a photodiode, in which the optical signal is transformed into a broadband electric signal, - the electrical signal is amplified, filtered and supplied to an A/D converter and transcribed into a broadband digital response signal, - the electrical signal is amplified, filtered and supplied to an A/D converter and transcribed into a broadband digital response signal, • the digital response signal is supplied to the evaluation unit, which at least comprises - the n buffer memories and n correlation stages and n output buffers, - the digital response signal is correlated n times with the delayed modulation signal from the buffer memories for the purpose of creating measurement data sets of the individual locations, - the measurement data is transferred to an evaluation computer for performing an evaluation directly or via a buffer memory for the purpose of creating and outputting spatially resolved measurement values. - the n buffer memories and n correlation stages and n output buffers, - the digital response signal is correlated n times with the delayed modulation signal from the buffer memories for the purpose of creating measurement data sets of the individual locations, - the measurement data is transferred to an evaluation computer for performing an evaluation directly or via a buffer memory for the purpose of creating and outputting spatially resolved measurement values.