[et_pb_section fb_built=”1″ _builder_version=”4.9.4″ parallax=”on” top_divider_color=”#e02b20″ top_divider_height=”30px” hover_enabled=”0″ z_index_tablet=”500″ box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px” custom_margin=”0px|0px|0px|0px|true|true” custom_padding=”0px|0px|0px|0px|true|true” sticky_enabled=”0″][et_pb_row _builder_version=”4.9.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_margin=”0px|0px|0px|0px|true|true” hover_enabled=”0″ width=”100%” custom_padding=”0px|0px|0px|0px|true|true” sticky_enabled=”0″][et_pb_column type=”4_4″ _builder_version=”3.0.47″ custom_padding=”|||” custom_padding__hover=”|||”][et_pb_image src=”https:\/\/iridian.com.cn\/wp-content\/uploads\/2018\/05\/Lidar_dark.jpg” _builder_version=”4.9.4″ custom_padding=”0px|0px||0px|false|false” hover_enabled=”0″ z_index_tablet=”500″ box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px” sticky_enabled=”0″ custom_margin=”0px|0px||0px|false|false”][\/et_pb_image][et_pb_image src=”https:\/\/iridian.com.cn\/wp-content\/uploads\/2014\/07\/iridian-logo.jpg” align=”right” _builder_version=”3.27.4″ custom_margin=”50px|||” z_index_tablet=”500″ box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px”][\/et_pb_image][et_pb_text _builder_version=”3.27.4″ z_index_tablet=”500″ text_text_shadow_horizontal_length_tablet=”0px” text_text_shadow_vertical_length_tablet=”0px” text_text_shadow_blur_strength_tablet=”1px” link_text_shadow_horizontal_length_tablet=”0px” link_text_shadow_vertical_length_tablet=”0px” link_text_shadow_blur_strength_tablet=”1px” ul_text_shadow_horizontal_length_tablet=”0px” ul_text_shadow_vertical_length_tablet=”0px” ul_text_shadow_blur_strength_tablet=”1px” ol_text_shadow_horizontal_length_tablet=”0px” ol_text_shadow_vertical_length_tablet=”0px” ol_text_shadow_blur_strength_tablet=”1px” quote_text_shadow_horizontal_length_tablet=”0px” quote_text_shadow_vertical_length_tablet=”0px” quote_text_shadow_blur_strength_tablet=”1px” header_text_shadow_horizontal_length_tablet=”0px” header_text_shadow_vertical_length_tablet=”0px” header_text_shadow_blur_strength_tablet=”1px” header_2_text_shadow_horizontal_length_tablet=”0px” header_2_text_shadow_vertical_length_tablet=”0px” header_2_text_shadow_blur_strength_tablet=”1px” header_3_text_shadow_horizontal_length_tablet=”0px” header_3_text_shadow_vertical_length_tablet=”0px” header_3_text_shadow_blur_strength_tablet=”1px” header_4_text_shadow_horizontal_length_tablet=”0px” header_4_text_shadow_vertical_length_tablet=”0px” header_4_text_shadow_blur_strength_tablet=”1px” header_5_text_shadow_horizontal_length_tablet=”0px” header_5_text_shadow_vertical_length_tablet=”0px” header_5_text_shadow_blur_strength_tablet=”1px” header_6_text_shadow_horizontal_length_tablet=”0px” header_6_text_shadow_vertical_length_tablet=”0px” header_6_text_shadow_blur_strength_tablet=”1px” box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px”]<\/p>\n
LiDAR, short for light detection and ranging, uses pulsed lasers to accurately calculate distances as well as correctly detect the size and shape of objects. The high resolution of the information \u2014 LiDAR can resolve to a few centimeters from more than 100 meters away \u2014 and the ability to create accurate model three-dimensional images have made the technology critical in many applications. Some uses include autonomous vehicles and automobile crash avoidance, surveying, environment, construction, agriculture, oil and gas exploration, and pollution modeling.<\/p>\n
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The applications use lasers that emit light of specific wavelength and standard silicon detectors that typically respond to anything from 300 nanometers to 1,200 nanometers. High-quality optical filters are part of the design, so the detectors, as much as possible, see only the reflected laser light. Integrating filters into a design can be challenging, which is why learning to correctly choose and incorporate filters can save a company time, money, and frustration.<\/p>\n
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By obtaining informed advice at the outset and making some easily accommodated changes to the design process, companies can save time and money while achieving their goals.<\/p>\n
[\/et_pb_text][et_pb_text admin_label=”How LiDAR Works” _builder_version=”3.27.4″ header_2_text_color=”#0065cb” z_index_tablet=”500″ text_text_shadow_horizontal_length_tablet=”0px” text_text_shadow_vertical_length_tablet=”0px” text_text_shadow_blur_strength_tablet=”1px” link_text_shadow_horizontal_length_tablet=”0px” link_text_shadow_vertical_length_tablet=”0px” link_text_shadow_blur_strength_tablet=”1px” ul_text_shadow_horizontal_length_tablet=”0px” ul_text_shadow_vertical_length_tablet=”0px” ul_text_shadow_blur_strength_tablet=”1px” ol_text_shadow_horizontal_length_tablet=”0px” ol_text_shadow_vertical_length_tablet=”0px” ol_text_shadow_blur_strength_tablet=”1px” quote_text_shadow_horizontal_length_tablet=”0px” quote_text_shadow_vertical_length_tablet=”0px” quote_text_shadow_blur_strength_tablet=”1px” header_text_shadow_horizontal_length_tablet=”0px” header_text_shadow_vertical_length_tablet=”0px” header_text_shadow_blur_strength_tablet=”1px” header_2_text_shadow_horizontal_length_tablet=”0px” header_2_text_shadow_vertical_length_tablet=”0px” header_2_text_shadow_blur_strength_tablet=”1px” header_3_text_shadow_horizontal_length_tablet=”0px” header_3_text_shadow_vertical_length_tablet=”0px” header_3_text_shadow_blur_strength_tablet=”1px” header_4_text_shadow_horizontal_length_tablet=”0px” header_4_text_shadow_vertical_length_tablet=”0px” header_4_text_shadow_blur_strength_tablet=”1px” header_5_text_shadow_horizontal_length_tablet=”0px” header_5_text_shadow_vertical_length_tablet=”0px” header_5_text_shadow_blur_strength_tablet=”1px” header_6_text_shadow_horizontal_length_tablet=”0px” header_6_text_shadow_vertical_length_tablet=”0px” header_6_text_shadow_blur_strength_tablet=”1px” box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px”]<\/p>\n
LiDAR is similar to radar. Both measure distances by emitting a signal \u2014 laser light for LiDAR and high-frequency radio transmissions for radar \u2014 that reflects off a distant object back to the system.\u00a0Electronic circuity measures the time between sending and receiving the signal and calculates the implied distance.<\/p>\n
A system will send the laser pulses and measure the time they take to reach the object in question and travel back after reflection, either by directly clocking the time or by noting a phase shift in the returned light and calculating time from that.<\/p>\n
A LiDAR system rapidly pulses a laser of specific wavelength, whether 532, 905, 1064, 1054, or 1550 nanometers. Different wavelengths lend themselves to specific applications. For example, the 905-nanometer wavelength has become popular in autonomous vehicles, while the 532-nanometer is a green laser that works well under water.<\/p>\n
Although there are custom gas-based detectors that can work with specific wavelengths, LiDAR \u00a0equipment \u00a0designers \u00a0typically \u00a0use \u00a0silicon-based \u00a0broadband \u00a0detectors \u00a0that \u00a0react \u00a0to wavelengths between 300 and 1,200 nanometers. The reason for the choice is cost, as such devices are relatively inexpensive and, therefore, easy on a project\u2019s budget.<\/p>\n
Unfortunately, the broadband nature of the detectors creates a problem. A unit will respond to not only the laser in question but many other light wavelengths and sources. To adapt a broadband device to a\u00a0narrow set of wavelengths, LiDAR applications require filters to eliminate extraneous wavelengths and focus\u00a0on the specific laser wavelengths in use. The equipment can then avoid false readings and reduce unnecessary information for faster and more effective analysis.<\/p>\n
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The filters used in a LiDAR system are, in concept, no different from a pair of sunglasses. The filter manufacturer coats a transparent base, called the substrate, with thin films of appropriate substances that, in theory, allow the laser\u2019s light wavelength to pass through while blocking others. In practice, there are multiple working characteristics to consider:\u00a0<\/p>\n
All the characteristics represent a set of trade-offs to make. The wider the angle of view, the greater the set of wavelengths the detector will see, reducing the range of blocking. The smaller the filter size, the less light that can pass through, although the designer gains a cost reduction. A coating that improves the signal-to-noise ratio might not perform well in the conditions under which the LiDAR system will work.<\/p>\n
The trade-offs provide a range of unintended consequences to design choices. Focus overly on one aspect, like wavelength selectivity, and the resulting product might be weak in another area \u2014 field of view, for example. Working with a filter vendor can aid designers and engineers in developing applications, recognizing problems before they happen.<\/p>\n
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To avoid problems, the best time to start working with a vendor\u2019s filter experts is early in the project for the maximum flexibility.<\/p>\n
Approach the process with an eye to real-world conditions and solutions rather than what sounds best in theory that could drive up costs. For example, over-specification can be a major blockade to faster and better results. A wish list of tighter specifications can make it more difficult to construct a filter that meets the requested characteristics necessary for actual use.<\/p>\n
One example is filter size, where it may be considerably more expensive to buy large filters and cut them down to the needed size rather than requesting the construction of small individual filters. Another example is wavelength blocking. If light is outside a detector\u2019s ability to react, there is no need for the filter to keep it from reaching the detector. Changing the size and placement of a filter in the optical path can affect how the entire device works and might improve performance while reducing costs.<\/p>\n
Stay open to different solutions. The goal is to obtain the wanted results from a new device while balancing technical and business needs, not to prioritize design choices that may have become habitual.\u00a0<\/p>\n
The most important lesson is to treat a filter vendor as a collaborator and partner. The experts in filter design and manufacturing can raise important questions based on experience and knowledge that might greatly help bring an application into reality.\u00a0<\/p>\n
For more information on LiDAR and filters, please see https:\/\/iridian.com.cn\/application-areas\/<\/a> \u00a0optical-filters-for-lidar-laser-sensors<\/a>\/ <\/u>and https:\/\/iridian.com.cn\/application-areas\/optical-filters-<\/a> \u00a0lidar-applications\/<\/a><\/p>\n [\/et_pb_text][et_pb_button button_text=”Download Whitepaper” button_alignment=”center” module_id=”popmake-14027″ module_class=”popmake-14027″ _builder_version=”3.27.4″ z_index_tablet=”500″ button_text_shadow_horizontal_length_tablet=”0px” button_text_shadow_vertical_length_tablet=”0px” button_text_shadow_blur_strength_tablet=”1px” box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px”][\/et_pb_button][et_pb_text admin_label=”Page bottom Iridian tag line” _builder_version=”3.27.3″ text_font_size=”12px” text_orientation=”center” module_alignment=”center” z_index_tablet=”500″ text_text_shadow_horizontal_length_tablet=”0px” text_text_shadow_vertical_length_tablet=”0px” text_text_shadow_blur_strength_tablet=”1px” link_text_shadow_horizontal_length_tablet=”0px” link_text_shadow_vertical_length_tablet=”0px” link_text_shadow_blur_strength_tablet=”1px” ul_text_shadow_horizontal_length_tablet=”0px” ul_text_shadow_vertical_length_tablet=”0px” ul_text_shadow_blur_strength_tablet=”1px” ol_text_shadow_horizontal_length_tablet=”0px” ol_text_shadow_vertical_length_tablet=”0px” ol_text_shadow_blur_strength_tablet=”1px” quote_text_shadow_horizontal_length_tablet=”0px” quote_text_shadow_vertical_length_tablet=”0px” quote_text_shadow_blur_strength_tablet=”1px” header_text_shadow_horizontal_length_tablet=”0px” header_text_shadow_vertical_length_tablet=”0px” header_text_shadow_blur_strength_tablet=”1px” header_2_text_shadow_horizontal_length_tablet=”0px” header_2_text_shadow_vertical_length_tablet=”0px” header_2_text_shadow_blur_strength_tablet=”1px” header_3_text_shadow_horizontal_length_tablet=”0px” header_3_text_shadow_vertical_length_tablet=”0px” header_3_text_shadow_blur_strength_tablet=”1px” header_4_text_shadow_horizontal_length_tablet=”0px” header_4_text_shadow_vertical_length_tablet=”0px” header_4_text_shadow_blur_strength_tablet=”1px” header_5_text_shadow_horizontal_length_tablet=”0px” header_5_text_shadow_vertical_length_tablet=”0px” header_5_text_shadow_blur_strength_tablet=”1px” header_6_text_shadow_horizontal_length_tablet=”0px” header_6_text_shadow_vertical_length_tablet=”0px” header_6_text_shadow_blur_strength_tablet=”1px” box_shadow_horizontal_tablet=”0px” box_shadow_vertical_tablet=”0px” box_shadow_blur_tablet=”40px” box_shadow_spread_tablet=”0px” global_module=”14031″ saved_tabs=”all”]<\/p>\n Iridian Spectral Technologies Ltd<\/span> <\/strong>(Iridian) is a diversified optical filter manufacturer that is an international leader in filter design and manufacture especially for application in the fields of fiber optic communications, optical spectroscopy, 3D entertainment, and in aerospace. Iridian is a global supplier with distributors in many countries.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":" LiDAR, short for light detection and ranging, uses pulsed lasers to accurately calculate distances as well as correctly detect the size and shape of objects. The high resolution of the information \u2014 LiDAR can resolve to a few centimeters from more than 100 meters away \u2014 and the ability to create accurate model three-dimensional images have made the technology critical in many applications. 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