US 12,085,448 B2
FTIR spectrometer with optical filter for low level gas detection such as formaldehyde and ethylene oxide
Martin L. Spartz, Ellington, CT (US)
Assigned to MLS ACQ, Inc., East Windsor, CT (US)
Filed by MLS ACQ, Inc., East Windsor, CT (US)
Filed on Oct. 25, 2021, as Appl. No. 17/509,141.
Application 17/509,141 is a continuation of application No. 16/653,689, filed on Oct. 15, 2019, granted, now 11,187,585.
Claims priority of provisional application 62/744,715, filed on Oct. 12, 2018.
Claims priority of provisional application 62/744,719, filed on Oct. 12, 2018.
Prior Publication US 2022/0042850 A1, Feb. 10, 2022
Int. Cl. G01J 3/45 (2006.01); G01J 3/28 (2006.01); G01N 21/3504 (2014.01); G01J 3/12 (2006.01); G01J 3/453 (2006.01); G01N 21/35 (2014.01)
CPC G01J 3/45 (2013.01) [G01J 3/28 (2013.01); G01N 21/3504 (2013.01); G01J 2003/1213 (2013.01); G01J 2003/2869 (2013.01); G01J 2003/4534 (2013.01); G01N 2021/3595 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A Fourier transform infrared spectrometry system, comprising:
a source for generating light;
an interferometer for receiving the light;
a sample cell containing a gas sample;
a narrowband detector for detecting the light after passing through the gas sample-gas; and
an optical filter for filtering light prior to being detected by the narrowband detector, with the interferometer providing resolution within a frequency range of the optical filter.