Lead Selenide/Lead Sulfide Short Form Catalog in PDF Format

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J13 Series Lead Sulfide Detectors

The J13 Series detectors are Lead Sulfide (PbS) photoconductive (PC) detectors designed for operation in the 1-3.5µm wavelength region. The wavelength of peak response depends on the formulation and operating temperature. These detectors provide an economical means of obtaining high performance in a rugged and compact package.

They are offered in flat plate cells, TO-style packages and thermoelectric coolers provide low temperature operation for increased sensitivity, longer wavelength operation and temperature stability. Parts listed here are Judson standard product offering. Custom detectors and specifications offered with built-in electronics, discreet filter, multiwavelength detectors and arrays are routinely provided in prototype
through production quantities.

J13P Series Room Temperature PbS Plate Cells: These basic detecting elements consist of a sensitized PbS film, electrodes and two electrical leads encapsulated on a quartz substrate. They come standard in a variety of active areas from 1 to 10 mm square.

J13TO Series Room Temperature TO Packaged PbS Detectors: These detectors are fabricated utilizing a hermetically sealed and inert gas backfilled TO-5, TO-8 or TO-3 style semiconductor package. This package protects the active element and provides the versatility of directly soldering or plugging into a PC board during manufacturing.

J13TE1 Series 1-Stage Thermoelectrically Cooled PbS Detectors: The J13TE1 Series detectors are high quality temperature stabilized PbS detectors mounted on a one-stage thermoelectric cooler with a thermistor for control and stabilization of the detector element. At the standard operating temperature of -20°C, the
wavelength peak is 2.5µm.

J13TE2 Series 2-Stage Thermoelectrically Cooled PbS Detectors: The J13TE2 Series detectors are high quality PbS photodiodes mounted on two-stage thermoelectric coolers with thermistors for control and stabilization of the detector element. At the standard operating temperature of -30°C, the wavelength peak is 2.6µm.

J13TE3 Series 3-Stage Thermoelectrically Cooled PbS Detectors: The J13TE3 Series detectors are high quality temperature stabilized PbS detectors mounted on a three-stage thermoelectric cooler with a thermistor for control and stabilization of the detector element. At the standard operating temperature of -60°C, the
wavelength peak is 2.7µm. This detector offers exceptional sensitivity in a compact and easy to integrate package.

Lead Salt Detector Basic Operating Circui

Applications

• NDIR Spectroscopy
• Optical Pyrometry
• Flame Spectroscopy
• Moisture Analyzers

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Lead Sulfide Packages

TO-3	TO-5

1-Stage TO-37	2-Stage TO-37

1-Stage TO-8	2-Stage TO-8

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Lead Selenide/Lead Sulfide Short Form Catalog in PDF Format

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J14 Series Lead Selenide Detectors

The J14 Series detectors are Lead Selenide (PbSe) photoconductive (PC) detectors designed for operation in the 2-6 µm wavelength region. The wavelength of peak response depends on the operating temperature and varies from 4 to 4.7
µm. These detectors provide an economical means of obtaining high performance in a rugged and compact package. They are offered in flat plate cells, TO-style packages both with and without thermoelectric coolers which provide low temperature operation for increased sensitivity, longer wavelength operation and temperature stability. Parts listed here are Judson standard product offering. Custom detectors and specifications are offered with built-in electronics and discreet filters. Multiwavelength detectors and arrays are routinely provided in prototype through production quantities. Judson room temperature PbSe provides exceptional performance with minimum peak D* two to three times what other manufacturers offer as standard specifications.

J14P Series Room Temperature PbSe Plate Cells: These basic detecting elements consist of a sensitized PbSe film, electrodes and two electrical leads encapsulated on a quartz substrate. They come standard in active areas from 1 to 3 mm square. Judson room temperature PbSe provides exceptional performance with minimum peak D* two to three times what other manufacturers offer as standard specifications.

J14TO Series Room Temperature TO Packaged PbSe Detectors: These detectors are fabricated utilizing a hermetically sealed and inert gas backfilled TO-5 style semiconductor package. This package protects the active element and
provides the versatility of directly soldering or plugging into a PC board during manufacturing.

J14TE1 Series 1-Stage Thermoelectrically Cooled PbSe Detectors: The J14TE1 Series detectors are high quality temperature stabilized PbSe detectors mounted on a one-stage thermoelectric cooler with a thermistor for control and stabilization of the detector element.

J14TE2 Series 2-Stage Thermoelectrically Cooled PbSe Detectors: The J14TE2 Series detectors are high quality temperature stabilized PbSe detectors mounted on a two-stage thermoelectric cooler with a thermistor for control and
stabilization of the detector element.

J14TE3 Series 3-Stage Thermoelectrically Cooled PbSe Detectors: The J14TE3 Series detectors are high quality temperature stabilized PbSe detectors mounted on a three-stage thermoelectric cooler with a thermistor for control and stabilization of the detector element. At the standard operating temperature of -60°C, this detector offers exceptional sensitivity in a compact and easy to integrate package. Peak detectivity is greater than 4.7 µm.

Lead Salt Detector Basic Operating Circuit

Applications

• Environmental Gas Analysis
• Medical Gas Analysis
• Flame Spectroscopy
• Optical Pyrometry
• NDIR Spectroscopy
• Defense Applications

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Lead Selenide Packages

TO-3	TO-5

1-Stage TO-37	2-Stage TO-37

1-Stage TO-8	2-Stage TO-8

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Indium Antimonide Short Form Catalog in PDF Format

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J10D Series Indium Antimonide Detectors

J10D Series detectors are high quality Indium Antimonide (InSb)photodiodes, providing excellent performance in the 1 to 5.5 µm wavelength region. Single crystal p–n junction technology yields high speed, low noise detectors with excellent uniformity, linearity and stability.

Applications

• Thermal Imaging
• Heat-Seeking Guidance
• Radiometers
• Spectrometry
• FTIR

InSb detectors are photovoltaic and generate current when exposed to infrared radiation. Figure 2 shows the equivalent circuit for InSb, including the shunt resistance RD, junction capacitance CD and shot noise. The shot noise results from the DC current IBG produced by the background infrared radiation. Because IBG is proportional to the detector active area (Fig. 5), smaller detectors have less shot noise and lower values of NEP.

Figure 1	Figure 2	Figure 3

Field of View: A standard cold field of view (FOV) is provided at no extra charge. A custom field of view can be supplied for a small extra charge. Detectivity can be improved and IBG reduced by restricting the FOV angle. The FOV cold stop angle should be chosen to restrict unwanted background radiation while still accepting all desired radiation from the optical system. A 60° (full-angle) FOV, corresponding to 1/F optics, is provided unless otherwise specified.

Cold Filters: Optional cold filters can improve detectivity by eliminating background radiation in unwanted wavelength regions. The D* performance with the SP28 cold filter (0.5-2.8µm) and the SP35 cold filter (1.7-3.5µm ±0.3µm) is shown in Figure 1. Other bandpass filters are available on a custom basis.

Dewar Packages: All J10D Series InSb detectors require 77°K operating temperatures. The detector comes mounted in the standard M204 or M205 metal dewar with a sapphire window and a 60° field of view. Other window and dewar options are available. All InSb detectors can be provided in the LC1 Dewar Cooler Assembly or the RC2 Detector Cooler Assembly for operation without bulk liquid nitrogen.

Figure 4	Figure 5	Figure 6

Custom Detectors: InSb detectors in any size up to 7mm diameter and in any configuration can be provided on a custom basis. Contact Judson for specifications for linear position sensors, quad cells, and two-color (sandwich) detectors.

Preamplifiers: Optimum performance is achieved when the InSb detector is coupled into a Judson transimpedance gain preamplifier, which converts detector output current to voltage while maintaining the detector at the optimum zero volt bias (Fig. 3).

The PA-9 preamplifier is specifically matched to each InSb detector to provide maximum sensitivity, gain and bandwidth. The lower-cost, adjustable gain PA-7 preamplifier is suitable for lower frequency applications (DC-10KHz). When selecting preamp gain, choosing the largest practical value of RF results in the lowest overall noise. However, the detector IBG must be considered to avoid DC saturation of the preamp.

Example: The J10D-M204-R01M has a background current (IBG) of 7µA (from Fig. 5). Choosing RF= 1MW would result in a gain of 10E6, for a DC output of (7µA x 10E6 V/A) or 7V. This is near the saturation level of both the PA-7 and PA-9. Consequently, a gain of 10E6 is the maximum useable DC gain with this detector. An AC-coupled second stage may be added for further amplification. The background current IBG may be reduced by adding a cold filter or reducing the field of view.

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