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MICRO-CONTROLE / Spectra-Physics
Oriel Miniature Thermopile Detectors

Oriel Miniature Thermopile Detectors

Product catalog summary

Overview: The document provides detailed information on Oriel Miniature Thermopile Detectors, which are thermal detectors used in spectroscopy instruments. These detectors absorb electromagnetic radiation and measure the resulting temperature rise, offering a broad spectral response.

Specifications: The thermopile detectors have an active area of 0.55 x 0.51 mm and consist of 36 thermocouples. They can handle a maximum irradiance of 0.1 W cm^-2 and have a time constant of 50-100 ms. The resistance of the elements ranges from 47 to 57 kΩ, with a typical detectivity (D*) of 7 x 10⁷ cm Hz^1/2 W^-1 and a noise equivalent power (NEP) of 1 x 10^-9 W Hz^-1/2. The field of view is +/- 30° to 50% response, and the operating temperature range is -20 to +80 °C.

Window Materials: The choice of window material affects the spectral performance. The document lists several materials with their spectral range and transmittance: CaF₂ (0.13 to 11 µm, 94%), Sapphire (0.15 to 6 µm, 90%), KRS 5 (0.6 to 40 µm, 74%), and Si Filter (5 to 13 µm, 75%).

Detector Element Coating: The active detector element is coated with a black, metal oxide coating, which is influenced by the transmission properties of the windows used.

Basic Devices: Models 71750, 71751, 71752, and 71753 are offered without housings and require proper heat sinking. They provide microvolt level outputs and can be used with the 71774 Amplifier for voltage boosting. Housed units come with 1.5 Inch Series female flanges and include a low noise BNC cable for easy connection.

Temperature Compensation: The devices include a built-in thermistor for use in temperature compensating circuits, ensuring excellent long-term stability without requiring bias.

Ordering Information: The document provides a list of models with their respective window materials, responsivity, and housing options. Models 71750 to 71753 have a responsivity of 35-45 V/W, while models 71950 to 71971 offer 200-300 µA/W and are mounted in housing.

Figures and Diagrams: The document includes absorption and transmission graphs, as well as dimensional diagrams for both the basic and housed thermopile detectors, providing visual guidance on the product specifications and setup.

Catalog excerpts

1244 Phone: 1-800-222-6440 • Fax: 1-949-253-1680 S p e c t r o s c o p y I n s t r u m e n t s MONOCHROMATORS AND SPECTROGRAPHS BENCHTOP SPECTROMETERS MINISPECTROMETERS SINGLE CHANNEL DETECTION SYSTEMS AND CCD CAMERAS ACCESSORIES FOR FT-IR SPECTROMETERS SPECTROSCOPY INSTRUMENTS Oriel Miniature Thermopile Detectors Thermopile Detectors Thermal detectors of electromagnetic radiation operate by absorbing the radiation and measuring the subsequent temperature rise. Their broadband, wavelength-neutral response is only limited by the spectral flatness of their black coating and the transmission characteristics of any window materials used to protect them. Here we describe our miniature thermoplies with active area of 0.55 x 0.51 mm. ABSORPTION (%) WAVELENGTH (ìm) 100 80 60 40 20 0 5 10 15 20 Fig. 1 Absorption of our Thermopile Detector Coating. Which Detector Do I Choose? We offer a number of choices. One critical choice is the window material, as it limits spectral performance. Table 1 lists the standard materials we offer. Table 1 Window Specifications Material Spectral Range Transmittance Water Solubility Affected by Humidity CaF2 0.13 to 11 ìm 94 % 0.0017 g/100g Sapphire 0.15 to 6 ìm 90 % 0.0 g/100g KRS 5 0.6 to 40 ìm 74 % 0.05 g/100g Si Filter 5 to 13 ìm 75 % 0.0 g/100g TRANSMISSION (%) WAVELENGTH (ìm) 100 80 60 40 20 0 0 2 4 6 8 10 12 14 16 Fig. 2 71753 Si Filter Absorption. Detector Element Coating We coat the active detector element with a black, metal oxide coating. The spectral properties of this coating are modified by the transmission properties of the windows used with them. Basic Devices Basic devices, models 71750, 71751, 71752 and 71753, are offered with no housings. Mount them yourself; take care to heat-sink the cans for proper operation. They provide the usual microvolt level outputs. Use your own electronics or use our 71774 Amplifier (described on page 1246), to boost the voltage to an "easier to interface to" level. The same electronic performance can be achieved with the devices mounted in our standard housings, with 1.5 Inch Series female flanges. If a transimpedance amplifier is your electronic interface, use the models with a precision 100 kÙ series resistor, models 71967, 71968 and 71971. Proper Usage The 71750 - 71753 devices require appropriate sockets and proper heat sinking. The housed units eliminate these concerns. A low noise BNC cable for easy connection to your electronics is part of each of the housed detectors. Temperature Compensation The 71750 - 71753 devices are equipped with a built in thermistor which can be used in temperature compensating circuits. • Broad spectral response - 0.2 to 40 ìm • Excellent long term stability • No bias required

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S p e c t r o s c o p y I n s t r u m e n t s 1245 Email: [email protected] • Web: newport.com MONOCHROMATORS AND SPECTROGRAPHS SINGLE CHANNEL DETECTION SYSTEMS MINISPECTROMETERS BENCHTOP SPECTROMETERS AND CCD CAMERAS FT-IR SPECTROMETERS ACCESSORIES FOR SPECTROSCOPY INSTRUMENTS Specifications Detector Size 0.55 x 0.51 mm Number of Thermocouples 36 Maximum Irradiance 0.1 W cm-2 Time Constant 50-100 ms Resistance (elements only) 47 - 57 kÙ D* (typical) 7 x 107 cm Hz1/2 W-1 NEP (typical) 1 x 10-9 W Hz-1/2, typical Field of View to 50% response +/- 30 ° Temperature Stability of Responsivity -0.13...

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