The Diffraction Gratings have a line pair per micron parameter value of 0.2, which yields a 19.39° diagonal half field of view of the scene when we consider the first and central orders of the Diffraction Grating pair in use with the collimating lens. For the diffractive element that generates many orders of the projected source, we use a pair of Diffraction Grating surfaces that are orthogonal to each other to obtain X- and Y-axis orders. For this model, we have designed a 10mm focal length system to collimate the output of an LED array that has an active area of 1.6mm by 1.6mm. Using OpticStudio, optical engineers can design the projection and imaging optics that comprise the flash lidar system. Typically, some post-processing involving the time that the return signal was received versus when it was generated by the source is performed to calculate time-of-flight data, which in turn yields depth information of the scene. The receive module subsequently obtains an image of the projected array. The transmitting module usually consists of some collimating optics to project the source light into the far field as well as some diffractive optical element to generate many orders of this projection in two dimensions.
The overall composition of a flash lidar system involves two modules – a transmitting module to generate the detectable points that impinge upon the scene, and a receiving imaging module to capture the points. Sequential Analysis of the Flash Lidar System
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Finally, OpticsBuilder is leveraged to provide housing for the full flash lidar system using native OpticStudio geometry, enabling quicker iteration between the optical and opto-mechanical engineer for the packaging of the module. Custom analyses can be created and are used here to obtain depth information of the observed scene.
Conversion to Non-Sequential Mode is demonstrated and used to insert additional details, such as real-world source properties and scattering geometries. In this article, we will explore using OpticStudio to evaluate sequential models that comprise a flash lidar optical system. The benefit in obtaining three-dimensional spatial data for use in a small-form package has caused this solid-state lidar system to become more commonplace in consumer electronics products, such as smart phones and tablets. While vastly different embodiments of lidar systems exist, a “flash lidar” solution serves to generate an array of detectable points across a target scene with solid-state optical elements. In the consumer electronics space, engineers leverage lidar for several functions, such as facial recognition and 3D mapping.