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... > Instruments > Earth Remote Sensing Instruments > Active Remote Sensing > Spectrometers/Radiometers > Lidar/Laser Spectrometers > QC-TILDAS

Preferred term

QC-TILDAS  

Definition

  • The QC-TILDAS is a tunable infrared laser spectrometer, based on pulsed quantum cascade laser technology. The QC-TILDAS uses an absolute spectroscopic analysis method that is inherently self-calibrating, making calibration gases unnecessary. The QC-TILDAS is optimized for NH3, but it can be used for a variety of gases, depending on laser selection. Ambient NH3 is continuously sampled in a multipass (56-meter path length, 0.5-liter volume) cell at reduced pressure (30 to 60 Torr). The glass surfaces are siloxyl-coated to minimize surface losses. The QC-TILDAS uses the unique infrared spectroscopic identification, or fingerprint, of NH3 to quantify ambient NH3 levels. The QC-TILDAS consists of an optical and an electronic subunit, mounted together. The optical system is on a temperature-stabilized 25-centimeter (cm) × 60-cm optical breadboard and contains a laser, multiple-pass absorption cell, and infrared detectors, coupled with all-reflective optics. The quantum cascade laser for NH3 detection at a 10.3-micrometer wavelength is thermoelectrically cooled in a hermetically sealed housing and operates in the pulsed mode. The astigmatic Herriot multiple pass cell has two mirrors separated by 32 cm. Two infrared detectors, one for the sample cell and one for a reference cell are contained in one liquid nitrogen-cooled dewar. (Thermoelectrically cooled detector options are available with reduction in sensitivity.) The electronics subunit consists of laser temperature and current controllers, pressure and temperature probes, valve driver, and computerized data acquisition. The data acquisition rate is adjustable from 1 Hertz (Hz) to 20 Hz. The electronics are mounted in a standard 48.3-cm rack, 53.3 cm wide by 53.3 cm deep. The total height of QC-TILDAS is 61 cm. The combined weight of the electronics and optical modules is 77.3 kilograms. (en)

Broader concept

Change note

  • 2021-05-11 09:27:28.0 [tstevens] Insert Concept add broader relation (QC-TILDAS [686ad912-433c-4bc8-93d3-660f368c476c,606925] - Lidar/Laser Spectrometers [46238695-5577-4fad-91bf-0a2fdf8a9b19,598666]);
  • 2021-05-11 09:29:23.0 [tstevens] insert AltLabel (id: null category: primary text: Quantum Cascade Tunable Infrared Differential Absorption Spectrometer language code: en); insert Definition (id: null text: The QC-TILDAS is a tunable infrared laser spectrometer, based on pulsed quantum cascade laser technology. The QC-TILDAS uses an absolute spectroscopic analysis method that is inherently self-calibrating, making calibration gases unnecessary. The QC-TILDAS is optimized for NH3, but it can be used for a variety of gases, depending on laser selection. Ambient NH3 is continuously sampled in a multipass (56-meter path length, 0.5-liter volume) cell at reduced pressure (30 to 60 Torr). The glass surfaces are siloxyl-coated to minimize surface losses. The QC-TILDAS uses the unique infrared spectroscopic identification, or fingerprint, of NH3 to quantify ambient NH3 levels. The QC-TILDAS consists of an optical and an electronic subunit, mounted together. The optical system is on a temperature-stabilized 25-centimeter (cm) × 60-cm optical breadboard and contains a laser, multiple-pass absorption cell, and infrared detectors, coupled with all-reflective optics. The quantum cascade laser for NH3 detection at a 10.3-micrometer wavelength is thermoelectrically cooled in a hermetically sealed housing and operates in the pulsed mode. The astigmatic Herriot multiple pass cell has two mirrors separated by 32 cm. Two infrared detectors, one for the sample cell and one for a reference cell are contained in one liquid nitrogen-cooled dewar. (Thermoelectrically cooled detector options are available with reduction in sensitivity.) The electronics subunit consists of laser temperature and current controllers, pressure and temperature probes, valve driver, and computerized data acquisition. The data acquisition rate is adjustable from 1 Hertz (Hz) to 20 Hz. The electronics are mounted in a standard 48.3-cm rack, 53.3 cm wide by 53.3 cm deep. The total height of QC-TILDAS is 61 cm. The combined weight of the electronics and optical modules is 77.3 kilograms. language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/686ad912-433c-4bc8-93d3-660f368c476c

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