US 12,015,386 B2
Logarithmic demodulator for laser Wavelength-Modulaton Spectroscopy
Javad Rezanezhad Gatabi, Austin, TX (US); and Brendan James Smith, Lakeway, TX (US)
Assigned to SeekOps Inc., Austin, TX (US)
Appl. No. 17/913,811
Filed by SeekOps Inc., Austin, TX (US)
PCT Filed Mar. 25, 2021, PCT No. PCT/US2021/024177
§ 371(c)(1), (2) Date Sep. 22, 2022,
PCT Pub. No. WO2021/195394, PCT Pub. Date Sep. 30, 2021.
Claims priority of provisional application 62/994,680, filed on Mar. 25, 2020.
Prior Publication US 2023/0353128 A1, Nov. 2, 2023
Int. Cl. G06G 7/24 (2006.01); H03H 11/12 (2006.01); H03H 11/04 (2006.01)
CPC H03H 11/1291 (2013.01) [H03H 11/1221 (2013.01); H03H 2011/0494 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a first filter, wherein the first filter has a central frequency of nf which is a harmonic of frequency f, and wherein the first filter is configured to receive and filter an analog signal to generate a first filtered analog signal;
a second filter, wherein the second filter has a central frequency of f, wherein the second filter is configured to receive and filter the analog signal, to generate a second filtered analog signal;
a first demodulation converter configured to convert the first filtered analog signal to a first demodulated signal;
a second demodulation converter configured to convert the second filtered analog signal to a second demodulated signal; and
a differentiator configured to subtract the first demodulated signal from the second demodulated signal to generate a differential signal.