Although Lidar is currently used in many smart cars, its cumbersome size and high cost are similar to Google’s recently released expensive “small bean†driverless car, which looks like There is no such "stupid" car company willing to invest this technology in its production car. Therefore, if the volume can be smaller and the price can be lower, it may be that such equipment will enter the homes of ordinary people in the future.
This article refers to the address: http://
Currently, a graduate student from the University of California at Berkeley, Behnam Behroozpour, is eyeing the lidar. Together with colleagues in the lab, they are trying to package a full 3D image forming system (commonly known as LIDAR) into a solid-state package that can be easily used on a smartphone or gamepad.
Behnam Behroozpour explained in detail to the author:
According to current assumptions, such a laser radar device consists of three parts. We first prepare a 3mm × 3mm optoelectronic chip, and secondly we have a CMOS sensor chip, and 'everything is ready, only owe the east wind', also need a chip size VCSEL (vertical cavity surface laser transmitter) device. However, we only tested the performance of individual chips separately before we started assembling them. The final molded product is about the size of Microsoft's Kinect box.
Multi-pixel integrated 3-D camera uses FMCW laser source
Although it is not clear how accurate the integrated Lidar system can achieve, from the current experimental data, the laser beam can be detected in a range of about 10 meters. However, this is obviously not enough if it is to be used in the automotive field, and this geek group from Berkeley has begun to study how to achieve a range of 30m-100m.
LIDAR measures the distance of a target object by emitting a beam outward and calculating the time it takes to receive the reflection. To prevent measurement errors caused by receiving ambient reflected light, you can systematically adjust the energy value of the laser beam; even you can change its frequency, which makes it easier to obtain accurate data. Frequency adjustments like this are achieved by a very small, vibrating MEMS mirror placed on the right side of the silicon wafer.
The experimenters led by Behnam Behroozpour used electronic frequency modulation to make these mirror devices vibrate naturally. According to his words, although this approach is more complicated and time-consuming and labor-intensive, on the one hand, it can reduce the loss of light energy, on the other hand, it can also obtain the ideal signal-to-noise ratio. The noise in this test, mainly from diffused light, may be mistaken for the reflection of the laser beam to cause interference in the measurement of experimental data.
Mixed 3D circuit schematic of MEMS-electron-optical chip
The autonomous vehicles that appear on the market now rely on a large number of sensing technologies including laser, radar, ultrasonic, standard camera, stereo camera, GPS, inertial guidance and even Wi-Fi, and radar equipment is the most important. part. On the one hand, the radar can be used normally under any lighting and weather conditions; on the other hand, thanks to the high development of the aviation industry, its size and cost have been greatly reduced. Even with some inexpensive LIDAR equipment placed in an inconspicuous place around the body, high-resolution, continuous-focus information scanning is also possible.
But to do this, you have to lower the cost first. The LIDAR equipment, which is said to be placed on the roof of Google's driverless car, costs $70,000. Behroozpour said he hopes he and the team's first laser-radar integrated device can control the cost to a few hundred dollars, although this may still be expensive for smartphones and Xbox game enthusiasts, but can put a solid state The integration system to do this, obviously can be regarded as a very high cost performance.
summary:
Undoubtedly, if the future of Behnam Behroozpour can be realized, then this small, low-cost laser radar device can be used not only in driverless cars, but also in your smartphone and your Kinect gamepad. Think about it all. But the friends have such a problem can not be ignored: this is a laser box superimposed by three 3mm × 3mm chips used in small equipment, but if a car carrying passengers use such a gadget Children, whether security can be effectively guaranteed, is not yet known.
Take the SLR and the card machine for comparison. The card machine is light and easy to carry, but it still can't achieve the image quality and lens range of the SLR no matter what. However, the essence of innovation lies in breaking the ground. At present, the LIDAR used by Google driverless cars is too expensive, and it is indeed a hindrance to its commercialization. It is assumed that Behnam's research can scan the accuracy, range and physical image of objects. If you can get better, then the spring of Google's driverless car is coming!
Outdoor Light Reflector,Aluminum Outdoor Light Reflector,Outdoor Metal Light Reflector,Outdoor Street Lighting Reflector
Yangzhou Huadong Can Illuminations Mould Manufactory Co., Ltd. , https://www.light-reflectors.com