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IR Spectrometers

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

High-Performance Liquid Chromatography: Types of Detectors

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

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Frequency selective bolometers.

M S Kowitt, D J Fixsen, A Goldin

|December 4, 2010

Summary

This summary is machine-generated.

We introduce the frequency selective bolometer (FSB), a novel concept for multiband radiometry in millimeter and submillimeter spectral regions. This technology offers compact, efficient instruments with improved performance for astronomical observations.

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Area of Science:

Astronomy and Astrophysics
Optical Engineering
Spectroscopy

Background:

Current multiband bolometric radiometers face limitations in size, efficiency, and optical complexity.
Millimeter, submillimeter, and far-IR spectral regions are crucial for studying cosmic phenomena.

Purpose of the Study:

To propose and describe the frequency selective bolometer (FSB) concept for advanced radiometry.
To outline the design and anticipated performance of an FSB-based multiband radiometer.

Main Methods:

The FSB utilizes a bolometer coupled to a quasi-optical interference filter with frequency-dependent characteristics.
Cascading multiple FSBs within a light pipe enables multiband operation.
A one-dimensional transmission-line model was used to predict prototype performance.

Main Results:

The FSB concept allows for controlled absorption, transmission, and reflection based on frequency.
FSB technology promises smaller, more compact cryogenic optics and reduced cryostat requirements.
High coupling efficiency and flexible focal-plane array configurations are anticipated.

Conclusions:

The frequency selective bolometer (FSB) offers significant advantages for developing next-generation, compact, and efficient multiband radiometers.
FSB technology is well-suited for creating close-packed focal-plane arrays, optimizing telescope throughput for astronomical research.