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厂商名称:Signal Recovery
商品名称:光学斩波器
商品型号:198A
简单信息:Signal Recovery 原隶属于美国EG&G公司,现隶属于美国AMETEK集团公司,是专业生产微弱信号检测类产品的制造商。其锁相放大器、光学斩波器、BOXCAR等始终处于行业的领先水平。

General
The model 198A is a dual frequency optical chopper, using a thin rotating metal blade with an inner set of 11 apertures and an outer set of 18 apertures to simultaneously chop two light beams. The blade is driven by a precision DC motor whose speed is controlled via a phase locked loop that is referenced to either an internal quartz crystal oscillator or an external reference signal. The chopper has three reference frequency outputs, one at each of the frequencies generated by the inner and outer apertures, and one at a frequency equal to their sum. The three frequencies f1, f2 and f1 + f2 are chosen to be relative primes which significantly reduces mutual harmonic interference.

It is ideal for use in measurements where two modulated beams give rise to a third optical signal at a frequency which is the sum of the two chopped frequencies. The model 198A acts as a chopper for the incident light sources at frequencies f1 and f2 and generates a reference signal at a frequency f1 + f2 which can be used to drive a subsequent instrument, such as a lock-in amplifier.

Mechanical Dimensions


Model 198A Mechanical Dimensions

Blade Dimensions

Model 198A Blade Dimensions

Specifications

Operation
Frequency 55 Hz to 1500 Hz
    outer sector 90 Hz to 1500 Hz, 18 apertures, f1
    inner sector 55 Hz to 917 Hz, 11 apertures, f2
    sum 145 Hz - 2417 Hz, f1 + f2
Control
    manual Digital push-button
    external Application of 0.5 V to 10 V sine or squarewave, 90 Hz to 1500 Hz to Sync In f1 BNC connector
Internal Frequency
    accuracy ±20 ppm at 25 °C
    stability ±30 ppm/ °C (range -10 °C to 60 °C)
Jitter (measured pk-pk and presented as a % of a full cycle)
    outer sector
        90 to 140 Hz blade only: 0.2%; blade + electronics: < 6%
        140 to 1500 Hz blade only: 0.2%; blade + electronics: <1.5%
    inner sector
        55 to 100 Hz blade only: 0.2%; blade + electronics: < 8%
        100 to 917 Hz blade only: 0.2%; blade + electronics: <2.0%
Lock indication Bicolor LED, showing Red when unlocked and Green when locked
Settling Time

 

7 s nominal for f1 + f2  = 1 kHz from switch-on;
9 s nominal for f1 + f2 frequency change from 150 to 2400 Hz;
30 s nominal for f1 + f2  frequency change from 2400 to 150 Hz
Outputs Sync Out f1 10 V pk-pk squarewave at outer sector chopping frequency (f1), 90 Hz to 1500 Hz
Sync Out f2 10 V pk-pk squarewave at inner sector chopping frequency (f2), 55 Hz to 917 Hz
Sync Out f1 + f2 10 V pk-pk squarewave at sum chopping frequency (f1 + f2), 145 Hz - 2417 Hz
Connectors BNC
Impedance 10 kW. Note that although the output voltage is 10 V pk-pk, the high output impedance means that the outputs can be directly connected to the Reference Frequency input of any SIGNAL RECOVERY lock-in amplifier without causing problems.
Power Requirements Via power adapter for 110 V AC, 50/60 Hz or 220/240 V AC, 50/60 Hz or external isolated 17 V to 20 V DC or AC rms. supply. State which voltage is required when ordering
Dimensions 4" high x 4.8" wide x 1.7" deep
(104 mm wide x 122mm wide x 44mm deep)
Weight 1 lb (0.45 kg) excluding power supply

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