Microprocessor-driven laser ceilometers

TL;DR: In this paper, an approach for 3D measurement and visualization of cloud formations using ceilometers and computer software is described. Butterworth et al. present a 3D visualization of data is enhanced by animating consecutive sets of data in a time loop to show the movement and evolution of clouds over the measurement site during an extended period of time.

TL;DR: In this paper, an optical distance measurement apparatus comprises a system controller for controlling the entire operation of a system, a light emitting circuit for emitting a high-power pulse light beam as a distance measuring medium to an object in response to a drive signal from the system controller, and a light receiving circuit for receiving a light beam reflected from the object.

TL;DR: In this paper, the output signals are passed by analog gating means during consecutive time slots following each other at the transmitter frequency and being phase shifted relative to transmitted light pulses, and the phase shift of the time slots is varied stepwise after preset time intervals.

TL;DR: In this article, a laser beam type distance measuring device consisting of a beam emitter, a receiver, and a returning laser beam sensor is presented, where an electrical signal processing circuit is connected to the going and returning beam sensors.

TL;DR: In this article, an improved distance measuring device of the type which utilizes an amplitude-modulated light wave to measure the phase difference between the transmitted and the received modulated wave and thereby determine the distance of an object, the device being characterized by a feedback path combined with the optical system of the device so that the difference in magnitude between a reception signal and a standard signal or a reference signal may be zero or within a predetermined range.

TL;DR: In this paper, the photodetector signal is integrated to develop an integral signal for each range step, which is then stored in a digital storage circuit, ordered in correspondence to the sequence of the range steps.

TL;DR: In this article, a pair of light intensity detectors spaced apart in range are used to measure the range of a target by reflecting light from a target to each detector and maintaining the intensity of the reflected light detected by one detector constant whereby the output signal of the other detector is a measure of range.

TL;DR: In this paper, a control circuit for maintaining the sensitivity of an avalanche diode at an optimum was proposed, where the frequency at which internally generated noise impulses are generated is maintained at a predetermined rate so that echo signals may be distinguished from such impulses.