The captured spectra are then combined using the minimum hold function. The OSA is also designed so that it samples more points/OPD when the translation of the retroreflector assembly is slower. Additional software performance is realized by utilizing an asynchronous, multi-threaded approach to collecting and handling interferogram data through the multitude of processing stages required to yield spectrum information.
The resolution of the instrument can be calculated as: where Δλ is the resolution in pm, Δk is the resolution in cm-1 (maximum of 0.25 cm-1 for this instrument) and λ is the wavelength in µm. Free PC Software for the GSP-830Through RS-232 or USB connection, EagleShot can transfer measurement data from the GSP-830 to a PC. Data can be printed as graphs or saved as a text file for further analysis. This OSA will easily detect lasers and other narrowband sources, but many broadband sources will not have sufficient power spectral density to be detected. The filter bank scheme was shown to provide more speech information than the zero-crossing scheme.
These schemes were implanted in a laboratory-based speech processor, which is described. A low-power switched capacitor speech spectrum analyzer embodying several novel design methodologies is also described. More recent spectrographs use electronic detectors, such as CCDs which can be used for both visible and UV light. Interferogram Data Acquisition The interference pattern of the reference laser is used to clock a 16-bit analog-to-digital converter (ADC) such that samples are taken at a fixed, equidistant optical path length interval. There are several kinds of machines referred to as spectrographs, depending on the precise nature of the waves. The laser diode is mounted in an LDM9T Laser Diode Mount, and the beam is redirected by mirrors mounted in POLARIS-K1 and KCB1 Kinematic Mounts. The software download page also offers programming reference notes for interfacing with our Optical Spectrum Analyzers using LabVIEW™, Visual C++, Visual C#, and Visual Basic.