Optical bandpass filters are designed to transmit a specific waveband.  They are composed of many thin layers of dielectric materials, which have differing refractive indices to produce constructive and destructive interference in the transmitted light

Camera filters provide a range of optical filtering effects in scientific, research, and industrial applications

Digital filters use digital signal processing (DSP) to perform numerical calculations on sampled values of a signal

Spectral filters are used to selectively transmit light according to its wavelength. They are not to be mistaken with color filters, which can be differentiated by an associated schott glass number

Interferometers measure distance in terms of wavelength and determine the wavelengths of light sources.

Data acquisition computer boards are self-contained printed circuit boards that typically plug into the backplane, motherboard, or otherwise interface directly with the computer bus.

RF filters and microwave filters are devices that pass or reject signals by frequency. Basic types include bandpass filters, band reject filters, low pass filters, and high pass filters

Signal filters block or decrease (attenuate) unwanted frequencies or signal wave characteristics

Active filters are electronic filers that use active components such as voltage amplifiers or operational amplifiers. The amplifier shapes and stabilizes the behavior of the filter, and serves as a buffer interface to the driven component

Active band pass filters are used to attenuate frequencies below and above a range of frequencies (i.e., the bandwidth or passband of the filter

Industrial filtration equipment is used to filter, thicken or clarify a mixture of different elements

Liquid filtration elements are used to remove impurities from liquids. They are used in water treatment systems and fluid processing applications.

Filtration media and elements are designed to remove suspended particles from a process stream. This product area includes bulk filter media, cartridges, housing-only products, and housing and filter assemblies. 

Imaging workstations are vision systems used for metrology or image analysis in laboratory and cleanroom settings

Passive filters are implemented using only passive components such as resistors, capacitors and inductors. These filters do not produce any amplification of the input signal