초록 ▼

A fundamental concept of the invention consists thus in the fact that temporally variable reference and object light bundles are generated for object detection, the bundles are superimposed at a light receiver and detected beam by beam and the penetration of the object by selected beams is determine

A fundamental concept of the invention consists thus in the fact that temporally variable reference and object light bundles are generated for object detection, the bundles are superimposed at a light receiver and detected beam by beam and the penetration of the object by selected beams is determined in response to the temporal variability of the superimposed beams.

대표청구항 ▼

The invention claimed is: 1. A method for object detection, comprising: generating temporally variable expanded reference and object light beams using a frequency shifted feed-back laser, superimposing the beams at a light receiver, detecting the beams at the light receiver ray by ray; and determin

The invention claimed is: 1. A method for object detection, comprising: generating temporally variable expanded reference and object light beams using a frequency shifted feed-back laser, superimposing the beams at a light receiver, detecting the beams at the light receiver ray by ray; and determining an object depth for selected rays in response to the temporal variability of the superimposed rays. 2. The method according to claim 1, wherein the light beams are generated with a comb-like frequency structure. 3. The method according to claim 2, wherein the frequency comb is tuned. 4. The method according to claim 1, wherein the temporal variability of the reference and object light beams occurs by means of the frequency shifted feed-back laser, the laser comprising at least a light amplifier in a resonator with temporally variable optical length. 5. The method according to claim 3, wherein successively more tuning frequencies are used. 6. The method according to one claim 1, wherein an acousto-optical modulator is used to cause a temporal variability, in particular an acousto-optical modulator installed in a resonator and excited with high frequency. 7. The method according to claim 1, wherein a multitude of detection elements is provided in the superimposed beams, and the object depth is determined only for a selection of detection elements. 8. The method according to claim 7, wherein the selection of the detection elements is performed using an optical projected image of the object. 9. The method according to claim 1, wherein the object light beam is also detected with an imaging detector. 10. The method according to claim 9, wherein the imaging detector used for detecting the object light beam is different from a light receiver which is used to determine the temporal variability of the superimposed rays. 11. A device for object detection, comprising: a frequency shifted feedback laser for generating expanded temporally variable reference and object light beams; a receiver having a multitude of detection elements for ray-by-ray detection of object and reference light beams; and an evaluation unit for evaluating the signature resulting from the superposition of the temporally variable object and reference rays. 12. The device according to claim 11, wherein the frequency shifted feedback laser comprises an optical resonator, light amplifier and a modulator. 13. The device according to claim 12, wherein the modulator is an acousto-optical modulator. 14. The device according to claim 13, wherein the acousto-optical modulator is connected to a frequency generator with a frequency between 0.1 MHz and 500 MHz. 15. The device according to claim 14, wherein the acousto-optical modulator is connected to a frequency generator with a frequency of approximately 100 MHz. 16. The device according to claim 12, wherein a selection unit is provided for selection of light receiver-detection elements to be read out or evaluated. 17. The device according to claim 16, wherein an imaging sensor array is provided. 18. The device according to claim 17, wherein the imaging sensor array is different from the light receiver. 19. The device according to claim 18, wherein the imaging sensor array and the light receiver have different spectral sensitivities. 20. The device according to claim 19, wherein the imaging sensor array is not sensitive to the wavelengths of the beam generating medium.