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Glossary of Spectroscopy Terms

We at StellarNet are proud to offer products for many diverse applications from quality control to metrology. We also understand that our customers have diverse backgrounds that may or may not include optics. We have put together a glossary of terms to help customers who are beginners (and non-beginners who might need the refresher). The terms can be browsed alphabetically, but they have also been grouped into the categories below. We recommend that complete beginners start with “Spectroscopy.” Happy experimenting!

ABCDE FGHIJK LMNOPQR – ST UVWXYZ

16-bit Digitizer

A/D Digitizer

Aberration

Aberration Correction

Absolute (Spectral) Irradiance

Absorbance

Absorption

Absorption Spectroscopy

Accessories

Accuracy

Acquisition

Analyzers

Averaging

Background Spectrum

Bad Pixel

Baseline Drift Correct

Baseline Noise

Baseline Offset

Bend Radius

Best Efficiency (of a diffraction grating)

Blaze Wavelength (of a spectrometer/diffraction grating)

Boxcar Smoothing

Broadband

Bulb Color Temp

Efficiency

Electromagnetic Radiation

Electromagnetic Spectrum

Electronic Noise

Electronic Offset

Elements

Emission

Episodic Data Capture

EPROM Spectrometer Memory

Exposure Time

External Hardware Trigger (Jack-in)

Extra Low Stray Light Values

F-number

Fiber optics

Fixed Pattern Noise

Flash Capture Interface

Flow Cells

Fluorescence

Fluorescence Spectroscopy (Fluorimetry)

Fluorophore Coating

Flux

Flux Density

Focal Length

Frequency

Fresnel Lens

Full Width at Half Maximum (FWHM)

Gas Emission Lines

Grating Efficiency Curve

Grating Order

Groove Density (of a diffraction grating)

Ground and Excited States

Jitter

LabView

Lambertian Reflector

Lamp

Laser

Laser Induced Breakdown Spectroscopy

Light-Emitting Diode (LED)

Light Sources

Linearity

Linux

Low cost

Luminance

Microscopy

Microsoft C/C#

Near Infrared (NIR)

NIST Calibrations

Noise

Noise Equivalent Power (NEP)

Numerical Aperture (NA)

OEM

OH concentration

Optical Density

Optical Metrology

Optical Resolution

Optics

Order Sorting Filters

Radiance

Radiometry

Radiometry Units

Raman Microscopy

Raman Probes

Raman Shift

Raman Scattering

Raman Spectroscopy

Ramulaser

Ray

Readout Noise

Receptor Type

Reference Spectrum

Reflectance Probe

Reflection

Refraction

Relative Irradiance

Research grade

Resolution

RMS noise

Rugged

Saturation

Sapphire Attenuated Total Reflectance (SATR) Probes

Scattering

Scope Mode

SDK

Second and Third Order Effects

Sensing

Sensitivity

SERS

Shot Noise

Signal to Noise Ratio (S/N)

Slit

SMA 905

Software

Spectral Attenuation

Spectral Line Emission

Spectral Range (of a diffraction grating)

Spectral Resolution

SpectraWiz®

SpectraWizard

Spectrograph

Spectrometer

Spectrometer Linux Drivers

Spectroscopy

Spectroscopy Standards

Spectrum

Specular Reflection

Spot Size

Stability

StellarCASE

StellarSCOPE Microscope

Stray Light

Super Range

SwDemo

SWDLL Spectrometer Driver

SymX-Czerny-Turner

System Sensitivity Curve

Temperature Compensation

Thermal Stability

Thermo-electric Cooling

Thin-Film Analysis Software

Time Averaging

Time Series Analysis

Transmittance

TTL input

Tungsten Halogen Lamp

VBA for MS Excel

Visual Basic

Voltage Offset

Wave

Wavelength

Wavelength Range

Wavelength-Division Multiplexing

Wavenumber Shift

Y-bundled Fiber

Yield Photon Flux