摘要:
Apparatus operable in accordance with the method of the present invention for measuring the angle of incidence of a light beam or plane relative to level comprises a photodetector array for sensing the light and a level mirror preferably comprising a pool of mercury. Optics are provided for transmitting the light to the photodetector array in alignment with the angle of incidence of the light (aligned light) and also after the light has been reflected from the mercury pool (reflected light). A shutter is provided for separating aligned light from reflected light such that distinct signals representative of the two are generated by the photodetector array. The distinct signals are processed by up-counting and down-counting a counter circuit to determine the average centers of light spots representative of the aligned light and the reflected light and the distance between those average centers which is representative of the deviation of the light beam or plane from level.
摘要:
An apparatus for producing registration holes in a sheet-like workpiece that is provided with registration marks. The apparatus comprises: a frame; sheet holding means associated with the frame for holding a workpiece in place; a main carriage associated with the frame, with one of the main carriage and the sheet holding means, and hence a workpiece, being movable back and forth in a first direction relative to the other; a cross carriage mounted in the main carriage, with one of the cross carriage and the sheet holding means being movable back and forth in a second direction relative to the other, with the second direction being at right angles to the first direction; a further carriage mounted on the cross carriage, with one of the further carriage and the sheet holding means being movable relative to the other substantially in the first direction; first sensor means for sensing the position of the main carriage relative to a given one of the registration marks on the workpiece; second sensor means for sensing the position of the cross carriage relative to the same given registration mark on the workpiece; third sensor means for sensig the position of the further carriage relative to another one of the registration marks on the workpiece; a first punch assembly that is secured to the cross carriage and is provided with a first punch to punch out said given one of the registration marks to produce a registration hole in the workpiece; and a second punch assembly that is secured to the further carriage and is provided with a second punch to punch out said another one of the registration marks to produce another registration hole in the workpiece.
摘要:
A combination laser detector and global navigation satellite antenna has a laser detector positioned in a known and fixed relationship with the nominal phase center of an included global navigation satellite antenna. The offsets for these elements may be fixed, simplifying set up.
摘要:
The method of mobile radio positioning aided by a single fan laser comprising: generating a single sloping fan beam by using a stationary fan laser transmitter positioned in a location with known coordinates; detecting the single sloping fan beam by using the mobile laser detector; receiving the averaged low-passed filtered estimate of angular rate of the laser beam; receiving the plurality of main time tags; receiving the plurality of additional time tags; and timing the fan laser beam strike at the rover's location to improve an accuracy in determination of position coordinates of the rover.
摘要:
A laser light detector is provided which can be used to detect pulsed laser light that is produced by a rotating laser light source on a construction job site. The laser light detector provides an easily-read display which is indicative of the present level or elevation of the laser light detector with respect to the plane of rotating laser light. The laser light detector has a very large dynamic range, while maintaining a very good signal-to-noise ratio, and can, therefore, be used at both short and long distances from the rotating laser light source. The laser light detector is not dependent upon the energy level received of laser light, or by the spot size of laser light as it reaches the light detectors. Multiple discrete steps of elevation indication are provided, which can easily be increased to a larger number of discrete steps, if so desired. The laser light detector is available with several options, including dead band adjustment, normal or offset on-grade displaying, and averaging.
摘要:
A system for surveying the contour of land and for automatically determining the most efficient movement of dirt in order to obtain a desired grade utilizes a stationary transmitter which generates a rotating laser beam plane across the field to be surveyed. A receiver and a control circuit are mounted on a vehicle which is adapted to drive across the field. After providing the control circuit with certain initialization data, an operator drives the vehicle over the field in a predetermined manner to enable the control circuit to take elevational readings at selected points. After the survey has been completed, the operator can use the control circuit to display graphical information relating to the surveyed field. The operator can also utilize the control to calculate the amount of dirt which must be moved in order to obtain a desired grade on the field. The initialization and calculation routines are performed by the operator in response to prompting questions and statements displayed by the control circuit. One feature of the control circuit is the interchangeability of language modules which determine the language of the prompts. Another feature of the control circuit is a removable memory unit for the storage of the elevational data which can be connected to a remotely located computer for further processing of the elevational data.
摘要:
An improved yeast food is provided for use in yeast leavened bakery products that exhibits improved nitrogen availability for the yeast. The yeast food includes urea as the nitrogen source compound and is compatible with typical oxidizers used in yeast foods so that a bulking agent is not required in the yeast food.
摘要:
The method of mobile radio positioning aided by a single fan laser comprising: generating a single sloping fan beam by using a stationary fan laser transmitter positioned in a location with known coordinates; detecting the single sloping fan beam by using the mobile laser detector; receiving the averaged low-passed filtered estimate of angular rate of the laser beam; receiving the plurality of main time tags; receiving the plurality of additional time tags; and timing the fan laser beam strike at the rover's location to improve an accuracy in determination of position coordinates of the rover.
摘要:
A laser beam three dimensional position measurement system includes a laser transmitter mounted at a stationary reference position at a work site and a receiver mounted on a mobile machine at the site. The transmitter produces a laser reference plane by sweeping a laser beam about the transmitter. The receiver includes a retroreflector which intercepts and reflects laser energy back to the transmitter when the laser beam sweeps past the retroreflector. The system also includes at the transmitter a circuit composed of a photodetector, timer, clock and counter. The photodetector senses laser energy reflected back to the transmitter from the retroreflector. The timer modulates the laser beam produced by the transmitter in response to detection of the beam. The counter is connected to the clock and timer, and is enabled by the timer to start counting electrical pulses received from the clock when the beam is modulated. The counter is disabled to stop counting electrical pulses when the modulation is detected. The number of pulses counted by the counter is indicative of the range of the receiver from the transmitter. The orientation of the beam relative to a fixed reference axis at the time reflected laser energy is detected defines the direction of the receiver relative to the transmitter.
摘要:
A system for dampening vibratory motion of a pendulous compensator in a laser beam projector includes a beam splitter which diverts a portion of a laser beam deflected by a mirror mounted on a cantilever beam of the compensator, and a photocell device having a pair of photodetectors positioned to receive the diverted laser beam portion and sense oppositely varying proportions thereof corresponding to the displacement of the position of the deflected laser beam. Two output signals are produced corresponding in magnitudes to the respective proportions of the diverted laser beam portion sensed by the photodetectors. A difference amplifier takes the difference of these output signals to produce a first electrical signal having a polarity and magnitude representing the direction and amount of motion of the cantilever beam. A derivative circuit takes the derivative of the first electrical signal with respect to time to produce a second electrical signal having a polarity and magnitude representing the direction and rate of movement of the cantilever beam. An electrical coil, having a magnet reciprocally movable relative thereto which is linked to the cantilever beam, produces a magnetic force related in polarity and magnitude to the second signal to cause the magnet to resist the vibratory movement of the cantilever beam.