P1.1.3.2 Determining the Gravitational Constant (IRPD)


Determining the Gravitational Constant (IRPD)

Determining the gravitational constant with the gravitational torsion balance after Cavendish recording the deflections and evaluating the measurement with the IR position detector and PC.

This apparatus can be ordered as a complete set or individually for use with equipment your laboratory may already have. To select products for this experiment separately, use the item numbers listed at the bottom of this description to search and add to your cart.

The IR position detector (IRPD) enables automatic measurement of the motion of the lead balls in the gravitation torsion balance.  The four IR diodes of the IRPD emit an infrared beam; the concave mirror on the torsion pendulum of the balance reflects this
beam onto a row of 32 adjacent phototransistors. A microcontroller switches the four IR diodes on in sequence and then determines which phototransistor is illuminated each time. The primary S range of illumination is determined from the individual measurements. The IRPD is supplied complete with a disk containing Windows software for direct measurement and evaluation.  The data are registered via the serial interface RS 232 using a computer, or alternatively with a Yt-recorder. The system offers a choice of either the end-deflection or the acceleration method for measuring and evaluating.

1 332 101 Gravitation torsion balance
1 332 11 IR position detector
1 460 32 Optical bench with standardised profile, 1 m
1 460 373 Optics rider, 60/50
1 460 374 Optics rider, 90/50
1 300 41 Stand rod, 25 cm, 12 mm Ø

additionally required: PC with Windows XP or higher


Additional information

Weight 20 lbs
Dimensions 36 × 24 × 24 in
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