Voxtel Blog

Laser Ranging—Technical Notes Released

December 18, 2018

Voxtel has released a series of technical notes on laser ranging:

  • LRF Effective Range: The effective range of a laser rangefinder (LRF) depends on the sensitivity of its photoreceiver and the strength of optical signal returns as a function of target range. Parameters affecting signal-return strength are reviewed in this technical note, including laser pulse energy, atmospheric conditions, and the size, orientation, and surface properties of the target.
  • Relationship Between False-Alarm Rate and Probability of False Alarm: Discussed is the relationship between the probability of false alarm, as calculated from the false alarm rate (FAR), and the probability of detection as it relates to measuring target distance using a laser rangefinder.
  • Range-Walk Correction Using Time Over Threshold: This paper shows that a lookup table or polynomial correction based on time-over-threshold measurements can be used to reduce the range walk of an avalanche photodiode-based laser rangefinder to within ±0.2 m, at all ranges, over a pulse-return dynamic range of greater than 90 dB.
  • Limitations of NEP as a Lidar APD Photoreceiver Performance Metric: This paper shows that noise equivalent power (NEP) alone is not a good measure of the sensitivity of a laser-rangefinder receiver that employs an avalanche photodiode (APD). The optical signal required to achieve a specified detection probability for a detection threshold that achieves a specified false-alarm rate is shown to be a more reliable characterization of APD photoreceiver performance for laser-ranging applications.


3D Lidar Imaging For Use in Building Information Modeling (BIM)

October 3, 2017

George Williams from Voxtel will be presenting a talk on the use of 3D lidar imaging for use in building information modeling (BIM) at the Department of Energy (DOE) Advanced Methods of Manufacturing Annual Program Review on October 4, 2017. The title of the talk is:

4D LADAR Imaging for Building and Construction Management

The talk is sponsored by the DOE Advanced Manufacturing Office. For additional details, including the program schedule, see https://www.eventbrite.com/e/doe-ne-advanced-methods-in-manufacturing-annual-program-review-registration-37755490689


Laser Technology Improvements Lead Rangefinder Market Growth, Driving Demand for LRFs for Defense Modernization and Commercial Sports Equipment

September 12, 2017

According to an August 2017 report by Markets and Markets, the rangefinder market is projected to grow from an estimated USD 1.32 Billion in 2017 to USD 3.57 Billion by 2022, at a CAGR of 21.91% during the forecast period from 2017 to 2022. The growth of the market across the globe can be attributed to the increasing demand for high-precision equipment in industrial processes and enhanced accuracy in sports activities with the use of rangefinders.

The rangefinder market has been segmented based on type, end use, range, and region. Based on type, the rangefinder market has been segmented into laser and ultrasonic. The laser segment is projected to be the larger segment of the market, owing to the increased usage of such rangefinders in commercial applications.

Based on end use, the rangefinder market has been segmented into defense, commercial, and sports. The defense segment is expected to witness the highest growth during the forecast period, due to the increasing demand of precise and accurate information regarding the distance to a target in airborne, marine, and ground defense platforms.

Based on range, the rangefinder market has been segmented into high (>2.5 km), medium (500 m to 2.5 km), low (50 m to 500 m), and very low (<50 m). The low (50 m to 500 m) segment is projected to witness the highest growth during the forecast period. The very low range rangefinders are used in sports, such as golf, and shooting as well as commercial applications, including industrial automation.

The rangefinder market has been studied for regions, including North America, Europe, Asia Pacific, and Rest of the World (RoW). North America is estimated to be the largest market for rangefinders in 2017, owing to the increasing demand for rangefinders in countries, such as the U.S. and Canada. The rangefinder market in Europe and Asia Pacific is also expected to witness high growth, owing to the rapid modernization and rise in defense equipment upgrades by governments of various countries in these regions.

Utah State Students Design Point-n-Share Binoculars Incorporating Voxtel LRF OEM Module

August 9, 2017

Voxtel congratulates James M. Sargent and Zachary Hyatt of Utah State University. The pair recently took third place in Utah State’s Senior Design Night for their Point-n-Share Binoculars. These binoculars—which incorporate Voxtel’s Laser Rangefinder (LRF) Module for Original Equipment Manufacturers (OEMs)—allow users to share target locations with other users via an app. A poster presentation of Sargent and Hyatt’s work is available here, and a short video demonstrating their app can be found here.

DARPA awarded DRS, Voxtel, BAE and Loma “Software Reconfigurable Multifunction Imaging Sensors” contract

June 12, 2017

According to the military and avionics website reported on June 7, 2017, the US Defense Advanced Research Projects Agency officials also awarded DRS network and imaging systems LLC, Voxtel, BAE Systems’ Electronic Systems Division and Lockheed Martin Company Navigation and Fire Control department “software reconfigurable multi-functional imaging sensor” (ReImagine) contract. It can distinguish the sensor array in different areas of the imaging model, and before that, the need to use several different sensors to achieve this function.

The project seeks to develop a software reconfigurable multimodal imaging system whose function is usually not accessible within a focal plane array: the reconfigurable area can operate not only in other areas but also on the reconstructed array of measurements The idea is to develop an imaging focal plane array that can accommodate different conditions and modes of operation, collecting the most valuable information in the scene. Similar to the functions of a field programmable gate array (FPGA) processor, reconfigurable imaging sensors can be defined by using several imaging modes that may be designed after the array is designed.

On May 30, Lockheed Martin received a contract for a potential reconfigurable imaging project worth $ 10.2 million; on June 5, DRS received a $ 10.1 million potential contract; on 1 June, BAE Systems received Potential $ 7.5 million contract; May 30, Voxtel received a potential $ 5.2 million contract. (Ministry of Industry and Information Technology Electronics First Institute Xu Wenqi)

(Original title: DARPA awarded DRS, Voxtel, BAE and Loma “software reconfigurable multi-functional imaging sensor” contract)

Voxtel Is at SPIE DSS This Week

April 20, 2015

Visit us April 21 to April 23 in booth 1117 at the SPIE Defense, Security, and Sensing (DSS) Expo at the Baltimore Convention Center in Baltimore, Maryland.

Synthesis of Colloidal PbSe Nanoparticles Using a Microwave-Assisted Segmented Flow Reactor

November 7, 2014

An Oregon State University / Voxtel team recently published a study evaluating the effect of nucleation temperature on PbSe nanoparticle size distribution, cryustallographic structure, particle shape, and particle composition. It was found that nucleation of Pb-rich species occurs in the microwave reaction zone, while PbSe nanoparticles form in the growth zone. The author’s peer-reviewed final manuscript, as accepted by the publisher is available here. The published article is copyrighted by Elsevier and can be found here.

Spatial mapping of electronic states provides clues that allow fine tuning of nanocrystal properties

October 31, 2014

Voxtel Nano scientists Thomas Allen and Peter Palomaki were recently published in the Journal of Physical Chemistry Letters in a collaboration with University of Oregon Assistant Professor George Nazin.  The paper entitled “Spatial Mapping of Sub-Bandgap States Induced by Local Nonstoichiometry in Individual Lead Sulfide Nanocrystals” explores the electronic structure of individual lead sulfide nanocrystals, which have applications in solar cells, photodetectors, and light-emitting devices.  Professor Nazin’s specialized scanning tunneling microscopy system allows scientists, for the first time, to spatially map the electronic states present in a single nanocrystal, providing clues for further tuning of the nanocrystal properties.  The observations made studying VoxtelNano’s lead sulfide quantum dots have already led to an improved understanding of devices currently in development at VoxtelNano.

NASA Tech Brief Magazine Reports on Voxtel’s Work on Materials for Thermoelectric Applications

September 2, 2014

To make cooling and electrical generation costs competitive with more traditional technologies that are not solid-state, Voxtel conducted work for the Marshall Space Flight Center on high-efficiency, easy-to-manufacture engineered nanomaterials for thermoelectric applications.  Developed thermoelectric (TE) materials were achieved using solution-processed nanocrystals. The published brief is available here. This work was conducted under NASA contracts NNM06AA41C and NNM07AA27C.

Paper Published: Pixelated Detector with Photon Address Event Driven Time Stamping and Correlation

June 26, 2014

A Voxtel/University of Oregon team has published the paper “Pixelated Detector with Photon Address Event Driven Time Stamping and Correlation.”

In the paper, we present the design, manufacture, and test results of an asynchronous event-driven address time-stamped (EDATS) pixelated array detector, operational over correlation time spans ranging from less than 10−6 to greater than 104 seconds. The pixelated EDATS detector was designed to measure the equilibrium density fluctuations on a nanometer-length scale using small angle x-ray scattering in x-ray photon correlation spectroscopy (XPCS) experiments. The detector sensor chip assembly (SCA) includes a custom readout integrated circuit (ROIC), hybridized to a silicon photodiode array, optimized for 500 eV to 2000 eV x-ray photons. The detector is shown to be capable of handling x-ray photon event rates of 100 million x-ray events per second, with less than 85 nanoseconds timing jitter per event.

The paper, which is published in the IEEE Transactions on Nuclear Science, is available for download here and through the IEEE Xplore Digital Library here.