US 12,281,982 B2
Ultrafast laser imaging with box lock-in
Eric W. Martin, Ann Arbor, MI (US); Torben L. Purz, Nordhorn (DE); and Steven T. Cundiff, Ann Arbor, MI (US)
Assigned to Monstr Sense Technologies, LLC, Ann Arbor, MI (US)
Appl. No. 18/554,654
Filed by MONSTR Sense Technologies, LLC, Ann Arbor, MI (US)
PCT Filed Apr. 20, 2022, PCT No. PCT/US2022/025503
§ 371(c)(1), (2) Date Oct. 10, 2023,
PCT Pub. No. WO2022/226039, PCT Pub. Date Oct. 27, 2022.
Claims priority of provisional application 63/176,928, filed on Apr. 20, 2021.
Prior Publication US 2024/0210314 A1, Jun. 27, 2024
Int. Cl. G01N 21/35 (2014.01); G01N 21/3563 (2014.01); G01N 21/95 (2006.01)
CPC G01N 21/3563 (2013.01) [G01N 21/9501 (2013.01); G01N 2021/3568 (2013.01); G01N 2201/06113 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electronic circuit comprising:
signal processing electronics comprising:
a filter; and
output electronics; wherein the signal processing electronics is configured to:
receive, by receive circuitry included in the signal processing electronics, an electrical signal from a photodetector, wherein the electrical signal is generated by the photodetector based on a light beam from a location on a material including a signal of interest and one or more modulation frequencies;
discriminate, by the filter, a portion of the electrical signal proportional to at least one characteristic of the signal of interest from other components of the electrical signal using a filter having a filter transfer function including a notch at a notch frequency corresponding to one of the one or more modulation frequencies;
determine, by the filter, a value for the at least one characteristic of the signal of interest from the discriminated portion of the electrical signal; and
output, by the output electronics, the value of the at least one characteristic of the signal of interest, wherein:
the filter operates on samples of the electrical signal having a sample rate period:
the one or more modulation frequencies include a first modulation frequency; and
the first modulation frequency is selected such that a period of the first modulation frequency is an integer number of the sample rate period.