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| Number | Title | Issue Date |
| 7414739 | Calibration system for sawmill scanning systems The method for calibration of a single point laser system used in a measuring system for wood boards in a sawmill includes the steps of storing two orthogonal dimensions of a calibration bar, the values of the two dimensions being different from each other; placing ... | 08/19/2008 |
| 7352446 | Absolute distance meter that measures a moving retroreflector A laser device and method capable of one or more dimensional absolute distance measurements and/or surface scanning and/or coordinate measurements of a moving external retroreflector or other moving target surfaces without using an incremental interferometer. ... | 04/01/2008 |
| 7342681 | High-speed calibration method and system for an image-capture apparatus The present invention provides a calibration method and circuit for outputting an average calibration value used in an image-capture apparatus. The calibration circuit comprises difference means accepting a plurality of digital signals from capturing a pixel of a ca... | 03/11/2008 |
| 7327446 | Self-compensating laser tracker An apparatus and method for compensating a coordinate measurement machine is provided, which may be a laser-based coordinate measurement machine, laser tracker, or other coordinate measurement device. In one exemplary method, such compensation comprises self-compens... | 02/05/2008 |
| 7286209 | Generation of wideband high power coherent optical radar signals An arrangement for generating a high power optical radar beam. The arrangement includes first and second laser sources each having a first laser for generating an optical beam of a relatively low frequency F1 and a second laser for generating an optical beam ... | 10/23/2007 |
| 7280069 | Range-finding radar apparatus with high-resolution pulse-width calculation unit A radar apparatus includes a modulation signal generating unit that generates a modulation signal based on an internal clock with a cycle Tc and generates a trigger signal in synchronization with the modulation signal, a carrier wave generating unit that generates a... | 10/09/2007 |
| 7224444 | Method and device for optically measuring distance The invention relates to a method for optical distance measurement, in which a transmitter of a transmission branch (14), which branch is integrated with a measuring device (10), transmits a modulated measurement beam (16, 36) in the direction o... | 05/29/2007 |
| 7177015 | Distance-measuring device A distance-measuring device, comprising a light source unit for emitting a distance-measuring light, a photodetection optical system, a projecting optical system for projecting the distance-measuring light from the light source unit to an object to be measured and f... | 02/13/2007 |
| 7030968 | Device for the three-dimensional recording of a scene using laser emission This device for the three-dimensional recording of a scene (4) comprises a laser emitter (20), elements for scanning along two rotation axes (16, 44) in order to scan the scene using a laser beam emitted by the laser emitter (20), a photo... | 04/18/2006 |
| 7023531 | Laser distance measuring device with phase delay measurement A laser distance measuring device (1) includes a laser diode (4) for emitting a high frequency intensity modulated measurement light beam (3) and connected with a signal generating unit (SGU) that generates a high frequency measurement signal ( | 04/04/2006 |
| 7020171 | Laser oscillator A laser oscillator that, in accordance with a laser output instruction value or a current instruction value that is input, excites a laser medium and obtains a desired laser output comprises: reference waveform generation unit for employing the laser output instruct... | 03/28/2006 |
| 6950639 | Local oscillator for generating an HF signal for direct mixing by using avalanche photodiodes A local oscillator for use in an optoelectronic distance measurement system for generating a narrow-band HF signal for direct signal mixing with a reception signal generated by an avalanche photodiode (2) from a light signal impinging on the latter, with the ... | 09/27/2005 |
| 6934035 | System and method for measuring optical distance The methods of the present invention are directed at an accurate phase-based technique for measuring arbitrarily long optical distances with sub-nanometer precision. A preferred embodiment of the present invention method employs a interferometer, for example, a Mich... | 08/23/2005 |
| 6917415 | Method of and apparatus for electro-optical distance measurement A method of and an apparatus for an electro-optical distance measurement in which a laser beam of a laser diode (1) is directed as an intensity modulated train of emitted light pulses onto an object, the reflected measurement pulse train (10) is detect... | 07/12/2005 |
| 6822732 | Surveying instrument having an auto-collimating function and a distance measuring function A surveying instrument includes a surveying instrument body which is rotatable about vertical and horizontal axes and has a telescope optical system for collimating the surveying instrument relative to a survey point; a collimator optical system for projecting first... | 11/23/2004 |
| 6586748 | Non-invasive water current measurement system and method A method and system are provided for measuring water current direction and magnitude. A plurality of beams of radiation are transmitted radially outward from a location above a body of water. Each beam is incident on the water's surface at an angle with r... | 07/01/2003 |
| 6463393 | Device for calibrating distance-measuring apparatus A transmitter emits high-frequency modulated optical radiation which is reflected by an object and is received by a measurement receiver. Part of the transmitter radiation is decoupled as reference radiation and guided via a calibration path to a referenc... | 10/08/2002 |
| 6384904 | Distance measuring apparatus The present invention relates to a distance measuring apparatus having an attenuation filter for adjusting luminous energy of a luminous flux incident on light receiving converting means. An object of the present invention is to provide a distance measuri... | 05/07/2002 |
| 6115114 | Laser scanning system and applications A laser scanner sensor for measuring the spatial properties of objects in a scene within a range less than a predetermined maximum object distance. Applications of the laser scanner system includes measurement of the dimensional weight of parcel(s) being ... | 09/05/2000 |
| 5991011 | Laser distance finding apparatus A laser range finding apparatus 10 comprises a pulsed laser 12, a light deflecting device 14, photo-receiver arrangement 16 and a reference object 18 arranged at a defined spacing from the light deflecting device 14. In this respect the reference object 1... | 11/23/1999 |
| 5880822 | Light wave distance measuring apparatus and method for determining distance of an object A light wave distance measuring apparatus includes a light-sending optical system and a light-receiving optical system, which are preferably arranged to be parallel to each other. Intensity-modulated light of the light-sending optical system is transforme... | 03/09/1999 |
| 5831719 | Laser scanning system A laser scanner for measuring the spatial properties of objects in a scene within a range less than a predetermined maximum object distance. A laser diode supplies a laser beam that is intensity-modulated by a reference waveform from a waveform generator.... | 11/03/1998 |
| 5742379 | Device and method for electronically measuring distances A device and method of electronically obtaining range or distances from the device to the target utilizing a central processing unit (CPU) in combination with a pulse repetition frequency generator, a plurality of photodetectors and a transistor to transi... | 04/21/1998 |
| 5737068 | Electronic distance measuring device using a phase difference detection method An electronic distance measuring device which includes a radiation source for emitting frequency-modulated radiation along one of two paths. The electronic distance measuring device also has a device for switching the emitted radiation from one of the two... | 04/07/1998 |
| 5737069 | Position detecting apparatus of optical interferometry A position detecting apparatus utilizing optical interferometry changes the wavelength of a light beam from the light source. The variation in the wavelength causes an increment and decrement Cx, Co in the number of waves in the measurement and reference ... | 04/07/1998 |
| 5608514 | High range resolution ladar In a high range resolution ladar, a chirp signal waveform is propagated as a divergent laser light waveform and the target reflected return is collected and converted to a current proportional to power. An undelayed chirp signal is added in a mixer to the... | 03/04/1997 |
| 5317375 | Optical distance measuring apparatus An optical distance measuring apparatus operable in accordance with an optical intensity modulating process to optically measure a distance between a driver's vehicle and a vehicle running ahead of his vehicle includes a light emitting portion serving as ... | 05/31/1994 |
| 5002388 | Optical distance measuring apparatus having a measurement error compensating function An optical distance measuring apparatus having measurement error compensating function for compensating the measurement error due to electromagnetic induction noise which would lower the accuracy in distance measurement. According to the optical distance ... | 03/26/1991 |
| 4942561 | Delay time measuring device A delay time measuring device for measuring a delay time of continuous pulses wherein the averaging effect is improved. The device comprises a rough estimation counter means and a precision measuring means, and the rough estimation counter means makes a r... | 07/17/1990 |
| 4636068 | Change-over shutter for light-wave range finder A change-over shutter for an optical range finder employs at least two slits for measurement light, one of which is employed during long distance measurements and the other of which includes a light reduction member and is employed for short distance meas... | 01/13/1987 |
| 4620788 | Apparatus for measuring pulse signal delay interval Apparatus for measuring the time delay between pulse signals, particularly in conjunction with electro-optical range finders. A coarse measurement counter counts the output of a reference oscillator, while a fine measurement interpolator determines the re... | 11/04/1986 |
| 4403857 | Distance measuring device and method Electromagnetic distance measurement, preferably utilizing optical signals. Signals from a main transmitter are transmitted from a first position to a second position and returned to the first position and simultaneously from the main transmitter along a ... | 09/13/1983 |
| 4297030 | Method and apparatus for measuring the distance and/or relative elevation between two points The distance between a target and a measuring point is measured by optical and electronic elements forming an opto-electronic circuit arrangement wherein a light beam is modulated by a first frequency signal. The light beam is divided to produce a measuri... | 10/27/1981 |
| 4274736 | Method and apparatus for electrooptical distance measurement With an electrooptical distance meter a reference signal is timeshifted by means of an electronic phase shifter (20), until it has a given phase relation to the measurement signal. Both signals are compared in phase by a double balanced mixer (22), the ou... | 06/23/1981 |
