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- 686ad912-433c-4bc8-93d3-660f368c476c 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." @default.
- 686ad912-433c-4bc8-93d3-660f368c476c id "1655994" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_id 46238695-5577-4fad-91bf-0a2fdf8a9b19 @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_id 93e67fc7-3a57-4cf0-a0f9-7f76cded167c @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_id c8fe757b-b530-4d67-a553-e4903f4430a5 @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_label "Active Remote Sensing" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_label "Earth Remote Sensing Instruments" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_label "Instruments" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_label "Lidar/Laser Spectrometers" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c path_label "Spectrometers/Radiometers" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c prefLabel "QC-TILDAS" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c reference "https://archive.epa.gov/nrmrl/archive-etv/web/pdf/01_vs_aerodyne.pdf" @default.
- 686ad912-433c-4bc8-93d3-660f368c476c tag "Instruments" @default.