What is a detector array?
A mosaic of closely spaced detector elements that convert the incident electromagnetic radiation into electrical signals, 2. A readout circuit that relays and multiplexes the electrical signal from each detector element (or pixel) to a small number of output amplifiers (usually one or two).
What is a SWIR sensor?
Short Wave IR (SWIR) is a subset of the infrared band in the electromagnetic spectrum, covering the wavelengths ranging from 1.4 to 3 microns. This wavelength is not visible to human eyes and as a result can often offer a better image than what is achievable with visible light imaging.
What can SWIR detect?
With SWIR we are able to capture unique information for materials identification, wildfire response, food security, mining/geology and other applications.
What is detector array in CT?
The detector array: the key component at the heart of a CT scanner. A key component of a modern multi-slice CT scanner is the detector array: this senses the X-ray radiation which is partially attenuated by tissues in the patient’s body, and converts them into a digital signal.
What is a detector in CT?
Detectors collect information regarding the degree to which each anatomic structure attenuated the beam during a CT Scan Machine. Instead of film to record the attenuated beam digital x-ray detectors collect the information in CT Scans. “Detector” refers to a single element or type of detector used in a CT Scan system.
Is SWIR thermal?
All objects emit light in the infrared range. Shortwave infrared (SWIR) is used in many applications for measuring objects >100°C. …
How do SWIR cameras work?
SWIR cameras detect reflected light similar to visible cameras. Due to the high absorption of SWIR light in water, the swimmers shown in the SWIR image exhibit high image contrast making them easier to detect.
What is the difference between MDCT and CT?
There are two main differences between conventional spiral CT and MDCT. Firstly, MDCT has a high acquisition speed (0.37 s rotation speed vs 1 s rotation speed for conventional CT); secondly, and probably more importantly, MDCT acquires volume data instead of individual slice data.
What is the difference between MDCT and HRCT?
MDCT showed 25 more lobes with cylindric, 11 more lobes with varicose, and four more lobes with cystic bronchiectasis than did HRCT. Sensitivity, specificity, and positive and negative predictive values of HRCT in detecting bronchiectasis were 71%, 93%, 88%, and 81%, respectively.
What are the types of CT detectors?
Generations of CT scanners:
- 1st: Translate-Rotate with single detector.
- 2nd: Translate-Rotate with row of detectors.
- 3rd: Rotate-Rotate with continuous rotation of a row of detectors. Most commonly used CT type.
- 4th: Rotate-Fixed with complete ring of fixed detectors.
- 5th: Electron beam scanner used in cardiac imaging.
What is SWIR and how does SWIR work?
What is SWIR? Short-wave infrared (SWIR) light is typically defined as light in the 0.9 – 1.7μm wavelength range, but can also be classified from 0.7 – 2.5μm. Since silicon sensors have an upper limit of approximately 1.0μm, SWIR imaging requires unique optical and electronic components capable of performing in the specific SWIR range.
What is SWIR spectral range?
The SWIR spectral range provides unique benefits compared with other spectral bands for both military and commercial applications. Some of the more pronounced benefits are: SCD launched the development of SWIR infrared detectors based on the leading InGaAs material in 2013.
What is an array detector and how does it work?
In use, an array detector, which is a position sensitive detector, is coupled to a dispersive unit, that is frequently a triple monochromator, in which the first two stages are run in a subtractive mode and act as a band pass filter. The third stage of the system is the dispersive element that delivers the spectrum to the array.
What is short wave infrared (SWIR) light?
Short-wave infrared (SWIR) light is typically defined as light in the 0.9 – 1.7μm wavelength range, but can also be classified from 0.7 – 2.5μm. Since silicon sensors have an upper limit of approximately 1.0μm, SWIR imaging requires unique optical and electronic components capable of performing in the specific SWIR range.