Pasco OS-8520 PHOTOMETER Manuel d'utilisateur télécharger pdf

Instruction Sheet

for the PASCO

Model OS-8520

PHOTOMETER

012-05631A

3/95

$1.00

Introduction

The PASCO OS-8520 Photometer is a non-electric com-

parative instrument which was designed as an accessory

for the OS-8515 Basic Optics System. The Photometer

base can stand on any flat surface for use with other optics

systems or for experiments not requiring an optics bench.

Equipment

The OS-8520 Photometer includes:

–Photometer with Base

– Set of Polarizers and Accessory Holder

– Neutral Density Filter Set which allows 25%,

50%, 75% and 100% transmittance.

Photometer

The PASCO OS-8520 Photometer operates in a similar

fashion to a wax photometer except the wax is replaced

by two high brightness fluorescent acrylic disks. By look-

ing through the eyepiece, students can see if the disks,

each receiving light from an opposite side of the photom-

eter, are equal in intensity. Although it is difficult for the

eye to determine relative intensities, it can detect equal

intensities quite accurately.

Phone (916) 786-3800 • FAX (916) 786-8905 • email: techsupp@PASCO.com

10101 Foothills Blvd. • P.O. Box 619011 • Roseville, CA 95678-9011 USA

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This instruction sheet written/edited by: Jon Hanks

A set of neutral density transmission filters (25, 50, 75,

and 100%) are included to be used on the Photometer to

block out a known amount of light so quantitative mea-

surements may be made. Note that because the Photom-

eter uses a fluorescent material, it will not respond

equally in the red and violet parts of the spectrum. This

Photometer was designed to be used with white light,

such as the PASCO Light Source (OS-8517). To de-

crease the intensity of the light that is emitted by the light

source, use a mask rather than decreasing the voltage to

the bulb. The use of a mask preserves the white color of

the light whereas a decrease in the voltage would change

the color of the emitted light to red.

A set of two mounted polarizers is also included. The

polarizer perimeters are marked in degrees and the

polarizers can be rotated to any angle to show the amount

of extinction of the transmitted light.

All the filters snap into the ends of the photometer and

can be rotated once they are snapped into place. The

polarizers are designed to fit on their own separate holder.

One polarizer can be snapped into each side of the holder.

How to Use the Photometer

To determine if the two sides of the photometer are illu-

minated by light of equal intensity, look down into the

conical eyepiece of the photometer. The cone is designed

to cast a shadow on the inner parts of the photometer to

allow a better view. Do not put your eye directly on the

eyepiece: keep your head at a distance which allows you

to comfortably focus on the orange indicator. If the light

is the same brightness on each side, the color and bright-

ness of the two sides of the orange indicator will appear to

be the same.

Polarizer

Eyepiece

Neutral Density

Filter

1 2 3 4 5 6

Résumé du contenu

Page 1 - PHOTOMETER

Instruction Sheetfor the PASCOModel OS-8520PHOTOMETER012-05631A3/95$1.00IntroductionThe PASCO OS-8520 Photometer is a non-electric com-parative instru

Page 2 - EQUIPMENT NEEDED

2Photometer 012-05631ALimited WarrantyPASCO scientific warrants this product to be free from de-fects in materials and workmanship for a period of one

Page 3 - Table 1.1: Positions

3012-05631A PhotometerProcedure➤NOTE: You may want to cover the crossed-arrow object on each light source to reduce theexcess light in the room. The

Page 4 - Experiment 2: Polarization

4Photometer 012-05631AExperiment 2: PolarizationPolarizedLightUnpolarizedLightFirst PolarizerNo LightSecond PolarizerFigure 2.1: Unpolarized light in

Page 5 - 012-05631A Photometer

5012-05631A PhotometerThe component, E, of the polarized electric field, Eo, is found by using trigonometry: E = Eo cosφ.Since the intensity of the l

Page 6 - Table 2.1: Data and Results

6Photometer 012-05631AProcedure➤ NOTE: You may want to cover the crossed-arrow objects on each light source to reducethe excess light in the room. T

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Pasco OS-8520 PHOTOMETER Manuel d'utilisateur

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