User's Manual

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Instruction Manual

No. 012-08852A

IR Sensor

PS-2148

Introduction

The PASPORT IR Sensor measures infrared radiation intensity over a broad spectrum,

allowing students to study a variety of phenomena including blackbody radiation, the

Stefan-Boltzmann law, heat flow by radiation, solar radiance and non-contact temperature

measurement.

Included Equipment Part Number

IR Sensor

PS-2148

Shutter with thumbscrew and washer

003-08860

Sensor Handle

CI-9874 (4-pack)

Additional Equipment Required

PASPORT interface

See PASCO catalog or www.pasco.com

DataStudio or DataStudio Lite

(required for computer-based data collection)

See PASCO catalog or www.pasco.com

DS Lite available for free download

Additional Equipment Recommended

PASPORT Extension Cord

PS-2500

Aperture Bracket

OS-8534

Thermal Cavity

TD-8580

PS-2148

Sensor Handle

IR Sensor

Shutter

Thumbscrew

& Washer

Summary of content (10 pages)

PAGE 1
Instruction Manual No. 012-08852A IR Sensor PS-2148 48 -21 G H T PS IR LI IR Sensor Sensor Handle Shutter Thumbscrew & Washer Included Equipment Part Number IR Sensor PS-2148 Shutter with thumbscrew and washer 003-08860 Sensor Handle CI-9874 (4-pack) Additional Equipment Required PASPORT interface See PASCO catalog or www.pasco.com DataStudio or DataStudio Lite (required for computer-based data collection) See PASCO catalog or www.pasco.
PAGE 2
IR Sensor Sensor Setup The sensor's silicon-based thermopile encapsulated in nitrogen with a thallium bromide-iodide (KRS-5) window has a flat spectral response from 0.7 to 30 µm. It measures radiation intensity up to 4500 W/m2. An integrated thermistor measures the temperature of the detector allowing the user to calculate detector-emitted radiation.
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Model No. PS-2148 Background Theory of Operation Ts Consider a blackbody of temperature Ts, whose shape can be approximated as an infinite plane, and a flat detector surface parallel to source with area Ad. Because radiation from an infinite plane propagates as a plane wave, the power flow from the source to the detector (Psd) equals the radiation emitted by a part of the source whose area is equal to the detector’s area, regardless of the distance between the source and detector.
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IR Sensor Usage Notes Usage Notes Field of View 92° There are two simple arrangements of source object and sensor. 48° In the first, the source approximates an infinite plane. The radiation propagates from the source as a plane wave, and the intensity does not increase with increasing distance from the source. In this arrangement the radiated power incident on the active area of the sensor is equal to the power emitted by an equivalent area of the source.
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Model No. PS-2148 Usage Notes temperature, allow the detector to cool between each measurement by moving it away from all hot objects. Then place the sensor near the object to be measured and monitor the detector temperature as it increases. Record the intensity when the detector temperature reaches a certain value. Alternatively, you can mount the shutter on the sensor and control the temperature by opening and closing it.
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IR Sensor Usage Notes and the sensor is irrelevant. Place the end of the fast-response temperature probe in the cup close to the side that the IR sensor is viewing. Set up your computer or interface to calculate (Ts4 – Td4), and to graph (Ts4 – Td4) versus thermopile voltage.* Pour hot water (about 70° C) into the cup. Leave some room for ice, but make sure that the water surface is above the sensor’s field of view. Start data collection. After a few seconds, add a piece of ice to the cup and stir gently.
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Model No. PS-2148 Suggested Activities (Ts4 – Td4) versus voltage Suggested Activities Solar Radiation Measure the radiation intensity from the sun. Compare it to the intensity from a different part of the sky. (When measuring the temperature of the sky, make sure that the sun and other objects such as trees and buildings are not in the field of view.
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IR Sensor Further Reading Intensity vs. Emissivity Using the TD-8580 Thermal Cavity, measure the radiation intensity emitted by different surfaces at the same temperature. How do the color and texture of surfaces affect the radiated intensity? Compare the intensity from a surface to the intensity from a cavity of the same temperature. TD-8580 Thermal Cavity Radiated Power vs.
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Model No. PS-2148 IR Sensor Specifications Active Area Size 1.5 × 1.5 mm Element Area 2.25 mm2 Number of Thermocouple Junctions 120 Field of View 48° or 92° (see “Field of View” on page 4 for description) Intensity Range -500 to 4500 W/m2 max. 0 to 1000 W/m2 linear Spectral response flat from 0.
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