研究目的
To present a method to construct a simple, sturdy and inexpensive photogate for elementary physics laboratories, addressing the issues of transmitter-receiver alignment and spurious light triggering.
研究成果
The constructed photogate features permanent IR transmitter-receiver alignment, isolation from spurious light, and improved timing measurements due to reduced aperture size for IR light. The design can be modified for larger photogates, useful in various experiments, with considerations for IR intensity control.
研究不足
The larger the photogate leg separation, the weaker the IR intensity impinging on the receiver. The IR intensity can be controlled by changing the value of the resistor R1, but the electric current to the transmitter should not exceed 50 mA.
1：Experimental Design and Method Selection:
The design involves creating a photogate skeleton from acrylic parts cut by a laser cutting company, with a circuitous groove for electric wiring and holes for IR transmitter and receiver.
2：Sample Selection and Data Sources:
The photogate is tested by measuring the acceleration of gravity using a 'Picket Fence' dropped through the photogate.
3：List of Experimental Equipment and Materials:
Includes acrylic parts, IR transmitter and receiver, resistors, connectors, 555CN timer integrated circuit, and a Parallax Propeller P8X32A Microcontroller.
4：Experimental Procedures and Operational Workflow:
Detailed steps for constructing the photogate, including drilling holes, assembling the handle, and wiring the electrical circuit.
5：Data Analysis Methods:
The position-time data from the 'Picket Fence' experiment are fitted to a quadratic form using Microsoft Excel to compute the acceleration of gravity.
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