| 摘要 |
The invention is directed to a method for optoelectronic distance measurement and a measurement device based on this method, in which two light emitters, particularly laser emitters and two photodiode receivers are used for calibration. Part of the modulated output of the main emitter reaches the measurement object and then arrives at the main photoreceiver in the form of scattered light and another part of the output of the main emitter travels directly to a reference photoreceiver, while a part of the modulated output of the reference light emitter is guided directly to the main photoreceiver and another part is guided directly to the reference photoreceiver. According to the invention, the light intensities of the main emitter and the reference emitter are simultaneously modulated with different modulation frequencies (f1, f2), and a signal mixture is formed in the main receiver as well as in the reference receiver, which signal mixture contains a signal with the intensity modulation frequency (f1) of the main emitter and a signal with the intensity modulation frequency (f2) of the reference emitter. The phases of the two signals of the signal mixture are measured simultaneously and the separation of the two phases is carried out by the different frequencies in a subordinate intermediate frequency range and by the different intensity modulation frequencies. At least two sequential measurement processes are preferably carried out, wherein the intensity modulation frequencies of the reference emitter and main emitter are exchanged in the second measurement process. Phase errors depending upon temperature, aging and reception power can be entirely eliminated by the invention in electro-optic distance measuring devices.
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