밀리칸 기름방울 실험
이 장치는 컴퓨터 화면과 함께 CCD 카메라를 사용하여 기름 방울을 편리하게 볼 수 있습니다. 소프트웨어 모듈을 사용하여 디스플레이 화면에서 액적 측정도 확인할 수 있습니다. 전면 패널에 디지털 디스플레이가 있으므로 전극 전체의 고전압 전원 공급 제어가 용이합니다.
Holmarc's Millikan oil drop apparatus (Model No: HO-ED-EM-01) is modernized version of classic set-up used to find out electron charge. The apparatus makes use of CCD camera along with computer screen for convenient viewing of oil droplet. Measurements of the droplets are also taken from display screen using a software module. Control of high voltage power supply across the electrode is made easy by having a digital display on the front panel.
The apparatus consists of two horizontal metal discs placed 10mm apart in a closed chamber. Non-volatile oils are used for the experiment. A bright LED is used for illuminating the droplets inside the chamber in order to get a clear view.
The significant difference in our setup is in the imaging system used for the observation of droplet movement. We use USB 2.0 camera which can be directly connected to the PC to monitor the droplet movement and can measure the velocity of the droplet with the help of Holmarc's dedicated software. This makes the measurements much easier and eliminates the need for conventional telescope and stopwatch system. A variable power supply of 0-2KV is used for conducting the experiment. The temperature inside the drop viewing chamber can be monitored through the front panel display system.
To determine the charge of an electron by Millikan's Oil Drop Method
Charge of an electron can be obtained from this relation,
q = ( ( V2 / V1 ) + 1 ) [ ( 4 / 3 π r3 ) ( ρ - ρair ) g d ] / V
V1 - Terminal Velocity
V2 - New Terminal Velocity
r - Radius of the Drop
ρ - Density of Liquid
ρair - Density of Air
g - Acceleration due to Gravity
d - Distance between the Plates
V - potential Difference
Power supply : 230V AC, 50 Hz
Power cord : 3 core 3 pin
Operating voltage : 0 - 2 KV
Video system : High performance CCD sensor
Camera lens magnification : 30 X
Lighting : High bright LED lighting mechanism
Optical power : 1 W
Dimension : 590 x 490 x 760 mm
Oil drop Control Unit
• Model No: ED-EM-01-OCU
• Chamber Voltage: 0-2 KV
• Quantity: 1 no.
Droplet Chamber
• Model No: ED-EM-01-DC
• Quantity: 1 no.
Top Charging Plate
• Model No: ED-EM-01-TCP
• Material: BrassQuantity:1 no.
CCD Camera
• Model No: ED-EM-01-CCDC
• Resolution: Selectable (320 - 1280 pixels)Connectivity:USB 2.0Quantity: 1 no.
Camera Lens Assembly
• Model No: ED-EM-01-CLA
• Magnification: 30 XQuantity:1 no.Camera Lens Assembly
LED Illumination Unit
• Model No: ED-EM-01-LIU
• Wave length: 589 nmOptical power:Black anodizedQuantity:1 no.LED Illumination Unit
Atomizer
• Model No: ED-EM-01-AM
• Quantity: 1 no.Atomizer
Accessories
• Measuring Scale
• Focusing Needle
• Sample Liquid
• User Manual
• Netbook PC (Optional)