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Laser Distance

Transmission time laser range sensor

1, laser distance transmission time Sensor Development

Laser in the detection of a wide field of application, technical content is very rich, on the impact of social production and life is also very obvious. Laser laser ranging is one of the earliest applications. This is because the laser has a directive, high brightness, good color, and many other advantages. 1965 years ago the Soviet Union using laser measuring the distance between the Earth and the Moon (380'103km) error of only 250m. American moon landing in 1969 in the month after the home side mirrors, but also to months with a laser distance measurement, error of only 15cm.

Laser to measure the distance of transmission time is the basic principle of laser and from the target by measuring the time required to determine the target distance.

Although the principle of laser ranging time transfer easy, simple, but previously used military and scientific research, in industry Automation Very rare side. As the high price of laser range sensor, usually several thousand dollars, high prices are impeding its wide application has been the main reason. However, more recently, laser ranging sensor technology has made significant progress since so prices have dropped a few hundred dollars, making it possible for many future occasions, the most cost-effective long-distance detection means of detection. Caused such a drastic price reduction

the main reason is the recent rapid growth of two kinds of consumer products.

One is cellular phone. Bee; Mobile Communication from the 70's there has been developing extremely rapidly, users doubling almost every year, especially the more alarming development in recent years. Promote the development of cellular phone Telecommunications Industry provides the excellent low noise performance Amplifiers . The core components of this amplifier is the transmission time timer.

The other is DVD Player. DVD Player's development has contributed to the development of low-cost visible laser diode. This sent the laser diode laser has better focusing properties, to achieve ultra-high density digital storage. And only a few years ago for the CD machine developed IR Laser diodes, the focusing properties of many times better.

Is the emergence of these new devices are coupled with surface-mount circuit board technology and clean cheap power, before the transmission time the development of laser distance sensor to a new level.

Fact, all industrial users looking for a relatively long distance to achieve precision in distance detection sensor. Because many cases will be affected by close physical location to install sensors and manufacturing constraints, the transmission time is now for occasions such as laser range sensor engineers solve problems.

II works Transmission time of laser sensors work, first laser diode at the target Launch Laser pulse. The goal of the reflected laser scattering in all directions. Part of the scattered light to return to the sensor receiver after the optical system receives the image to the avalanche photodiode. APD is an internal optical sensors with amplification, so that it can detect very weak light signals. Record and process issued from the light pulse to return is received by the experience of time, target distance can be measured. Transmission time must be very precise laser sensor measured transmission time, because the light is too fast.

Example, the speed of light is about 3'108m / s, wants to make a resolution of 1mm, the transmission time ranging sensor electronic circuit must be able to distinguish a very short time, the following:

0.001m ¸ (3'108m / s) = 3ps

3ps to identify the time, this is the excessive demands made of electronic technology to achieve them too expensive. But now low-cost laser sensor transmission time cleverly avoided this obstacle by using a simple statistical theory, which achieved an average of 1mm resolution rules, and guarantee response times.

Three other technology can not solve the problem to solve

Transmission time of laser distance sensor can be used for occasions other technologies can not be applied. For example, when the target close to, the calculation of the reflected light from the target ordinary photoelectric sensors can detect the completion of a large number of precise location of the task. However, when the target distance or target color changes within the ordinary photoelectric sensors would be difficult to deal with.

Although the background noise of advanced sensors and triangulation sensor color change in the target situation can work well, but not in the target fixed or objective point of view is too bright, the performance predictability of variation . In addition, triangulation range sensor generally limited to less than 0.5m.

Ultrasonic wave Although sensors are often used to detect distant objects, and optical devices because it is not so free from the color change. However, the ultrasonic sound velocity measurement sensor is based on the distance, so there are some inherent disadvantages, can not be used for the following occasions.

target analytes and the sensor transducer is not perpendicular to the occasion. Because ultrasonic sensors target must be in vertical position with angle less than 10 ° angle or less.

need a very small beam diameter of the occasion. Because the general ultrasonic beams in the far left when the sensor 2m diameter 0.76cm.

need to see spot for position calibration of the occasion.

windy occasion. vacuum occasions. temperature gradient larger occasions. Because this situation will cause changes in sound velocity.

need to respond quickly to the occasion.

The laser distance sensor can solve all these occasions the test.

Fourth, the extensive use of automation

Today, automatic detection and control methods, in addition to ordinary photoelectric sensors and ultrasonic sensors, was added to solve a long-distance measurement and test new ways? Transmission time of laser distance sensor. It provides for various occasions application flexibility, these occasions can be Package Include the following:

equipment positioning. material package measuring material level.

Measuring conveyor belt objects and objects from height.

measuring log diameter. overhead protection Crane From the collision.

no error checking occasions. 5, several application examples 1, measure the width of the box conveyor

Transmission time using two divergent
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Using a webcam to measure distance of laser points?

hi i study engineering at college and need help with my project. my aim is to measure the bending of a 70mm cylinder. lateral forces will be applied to the cylinder and these forces will be very small so the bending will not be seen to the human eye.
my design is to have a laser beam going down the inside of the cylinder and a reflector (at the end of the cylinder) reflecting the beam back up the cylinder. at the other end will be a webcam and a filter/screen between the reflected beam n webcam. so as the cylinder bends, it is possible to see from the webcam the change in position of the laser beam dot. how can i measure the distance of the position of the dots?
thanks

Rather than have the beam reflect off the cylinder directly into the webcam have it reflect to a flat piece of paper or cardboard with a marked origin position. If you still need the webcam you can aim it at the laser dot on the marked origin.

Bosch DLE 150 Laser Distance Measurer