光学快门_北京卓立汉光仪器有限公司

产品概述

产品概述

光学快门

美国SRS（斯坦福公司）光学快门系统：
美国斯坦福公司*新推出2 种超低振动光学快门系统：SR470 激光快门控制器和SR474 四通激光快门驱动器, 这2 款快门系统的主要是针对光学实验设计，振动很小，不会影响光学实验。SR470 可直接给（一个）快门头发信号，实现快门控制；而多通道的SR474，能驱动多达4 个快门头，可由外部时间信号（TTL触发信号）控制快门头，或者手动控制多个快门的开合。

SR470快门控制器

SR470 快门控制器可以给快门头发出信号，达到控制快门开合的目的。曝光时间可以灵活设置，在0.1ms 的分辨率下，时间设置范围为：4ms 到10000s ；可以设置先曝光和后曝光的时间；8 位数LED 显示器显示目前的参数为秒或是赫兹，时间可以精确到100ppm。
SR470 快门控制器具有多种触发方式：内触发、外触发及面板操作。SR470具有GPIB、RS232 及ETHERNET（网络）等接口，支持远程控制。所有的设备功能都可以通过任何一个接口进行控制和读取。SR470 快门控制系统具有自动检测功能，若快门发生故障，可以通过显示屏看到故障提示或听到故障报警，能帮助您及时发现并排除故障，提高了实验的可靠性。

SR475光学快门

SR474四通道快门驱动器

SR470前面板

SR470后面板

SR470控制器参数：

SR475 快门头是一款超低振动的快门头，通过微处理器时序控制内部机械结构，可实现光束的完全通断。不像普通的螺旋线式快门,SR475 快门头包括闭环的DSP控制系统，使开环闭环更加精确，而且使震动和机械噪音降到*低，减少了光学平台上的振动干扰。快门部件安装在2 个蓝宝石轴承之间，摩擦力降到*低，使快门具有大于一千万次的使用寿命。 3mm 的通光孔经的设计使调整更加方便，通光孔径能满足各类光源使用要求。响应时间（上升和下降时间）可达500μs，调制频率从直流电机到125Hz（任意占空比）可用。

快门电路控制部分

快门尺寸图

快门片采用独特的铍-铜合金

SR475激光快门头相关参数：

日本SIGMA公司光学快门：
日本SIGMA 公司的光学快门分为手动和电动产品。
手动快门：
1. 带有遥控装置（L=150mm），可以进行远程操作；
2. 快门速度可以在T、B、1、1/2 ～ 1/500 秒之间设定；
3. 设置为T 时，按下释放开关，快门打开，再次按下则关闭；
4. 设定为B 时，按下（不能松开）开关时，快门打开。

手动快门电

尺寸图

日本SIGMA 公司的电动快门，分为控制器和快门两部分。控制器分为1 轴（SSH-C1R）和4 轴（SSH-C4B）；快门分为：机械式快门(SSH-S) 和电磁式快门（SSH-R）。1 轴的控制器SSH-C1R 只能配合机械式快门SSH-S 使用。4 轴控制器SSH-C4B 可同时控制四个快门，触发方式有：按键触发、外部TTL 信号、上位机触发等，使用时非常方便。

控制器参数：

光学斩波器

光学斩波器的主要作用是将连续光调制成为有固定频率的光，同时输出调制频率。通常是与锁相放大器配合使用。光学斩波器一般由控制单元、斩波装置、斩波片和连接线等组成。

Chop frequency	4 Hz to 400 Hz (5/6 slot blade) 400 Hz to 3.7 kHz (25/30 slot blade)
Frequency stability	250 ppm/°C (typ.)
Frequency drift	＜2％，100HZ＜F＜3700HZ
Phase jitter (rms)	0.2° (50 Hz to 400 Hz) 0.5° (400 Hz to 3.7 kHz)
Frequency display	4-digit, 1 Hz resolution and accuracy
Frequency control	10-turn pot with 3 ranges: 4 Hz to 40 Hz 40 Hz to 400HZ 400 Hz to 3.7 kHz
Dual-Beam Experiment	0TO 10 VDC for 0 to 100 % of full scale. Control voltage overrides frequency dial.
Reference modes	ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, ƒouter – ƒinner
Dimensions	Controller: 7.7" × 1.8" × 5.1" (WHD) Head: 2.8" × 2.1" × 1.0" (WHD)
Blade diameter	4.04" ± 0.002"
Cable length	6 ft.
Power	12 W, 100/120/220/240 VAC, 50/60 Hz
Warranty	One year parts and labor on materials and workmanship, 90 days on motor

SR540 型光学斩波器是美国SRS（斯坦福）公司的产品，该产品采用内外孔双频设计，并可实现双频按指定模式工作，非常方便应用在双光束光学实验中。主要功能参数：频率范围：4Hz ～ 3.7KHz（内孔：4Hz ～ 400Hz ；外孔：400 ～ 3.7KHz）频率输出精度：＜ 2% 相位稳定度：0.2°～ 0.5°开放型斩波装置斩波片经光化学腐蚀（发黑）和消磁处理。

SR540 Specifications
The SR540 chopper will handle all your optical chopping requirements — from simple measurements to dual-beam and intermodulation experiments. The SR540 has a 4-digit frequency display, front-panel frequency control, analog voltage frequency control, and two reference outputs with selectable operating modes. Two anodized aluminum blades are provided: a 5/6 slot blade for frequencies up to 400 Hz, and a 25/30 slot blade for frequencies up to 3.7 kHz. Reference outputs are provided for frequencies corresponding to each row of slots, as well as the sum and difference frequencies

SR540	Optical chopper	$1195
O5402530	25/30 dual-slot replacement blade	$50
O54056	5/6 dual-slot replacement blade	$50
O5405	5-slot replacement blade	$50
O54030	30-slot replacement blade	$50
O540RCH	Replacement chopper head	$350

锁相放大器：
SR830 型锁相放大器为美国SRS（斯坦福）公司生产的数字双相型锁相放大器。
● 差动式或单端式输入模式
● 电流或电压信号输入模式
● 2nv到1V的增益设置范围（满档量程范围）
● 0.001Hz到102.4kHz频率响应范围
● 自动调整增益、相位、动态储备、补偿设置
● 时间常数范围：10μs到30ks
● 动态储备（Dynamic Reserve）：>100dB主要特性差动式或单端式输入模式
● 计算机接口：GPIB和RS-232

SR810 & SR830 DSP Lock-In Amplifiers
The SR810 and SR830 DSP Lock-In Amplifiers provide high performance at a reasonable cost. The SR830 simultaneously displays the magnitude and phase of a signal, while the SR810 displays the magnitude only. Both instruments use digital signal processing (DSP) to replace the demodulators, output
filters, and amplifiers found in conventional lock-ins. The SR810 and SR830 provide uncompromised performance with an operating range of 1 mHz to 102 kHz and 100 dB of driftfree dynamic reserve.

Input Channel
The SR810 and SR830 have differential inputs with 6 nV/√Hz input noise. The input impedance is 10 MΩ, and minimum full-scale input voltage sensitivity is 2 nV. The inputs can also be configured for current measurements with selectable current gains of 106 and 108 V/A. A line filter (50 Hz or 60 Hz) and a 2× line filter (100 Hz or 120 Hz) are provided to eliminate line related interference. However, unlike conventional lock-in amplifiers, no tracking band-pass filter is needed at the input. This filter is used by conventional lockins to increase dynamic reserve. Unfortunately, band pass filters also introduce noise, amplitude and phase error, and
drift. The DSP design of these lock-ins has such inherently large dynamic reserve that no band pass filter is needed.

Extended Dynamic Reserve
The dynamic reserve of a lock-in amplifier, at a given fullscale input voltage, is the ratio (in dB) of the largest interfering signal to the full-scale input voltage. The largest interfering signal is defined as the amplitude of the largest signal at any frequency that can be applied to the input before the lock-in cannot measure a signal with its specified accuracy. Conventional lock-in amplifiers use an analog demodulator to mix an input signal with a reference signal. Dynamic reserve
is limited to about 60 dB, and these instruments suffer from poor stability, output drift, and excessive gain and phase error. Demodulation in the SR810 and SR830 is accomplished by sampling the input signal with a high-precision A/D converter, and multiplying the digitized input by a synthesized reference signal. This digital demodulation technique results in more than 100 dB of true dynamic reserve (no prefiltering) and is free of the errors associated with analog instruments.

Digital Filtering
The digital signal processor also handles the task of output filtering, allowing time constants from 10 μs to 30,000 s with a choice of 6, 12, 18 and 24 dB/oct rolloff. For low frequency measurements (below 200 Hz), synchronous filters can be engaged to notch out multiples of the reference frequency. Since the harmonics of the reference have been eliminated (notably 2F), effective output filtering can be achieved with much shorter time constants.

Digital Phase Shifting
Analog phase shifting circuits have also been replaced with a DSP calculation. Phase is measured with 0.01° resolution, and the X and Y outputs are orthogonal to 0.001°.

Frequency Synthesizer
The built-in direct digital synthesis (DDS) source generates a very low distortion (–80 dBc) reference signal. Single frequency sine waves can be generated from 1 mHz to 102 kHz with 4½ digits of resolution. Both frequency and amplitude can be set from the front panel or from a computer. When using an external reference, the synthesized source is phase locked to the reference signal.

Useful Features
Auto-functions allow parameters that are frequently adjusted to automatically be set by the instrument. Gain, phase, offset and dynamic reserve are quickly optimized with a single key press. The offset and expand features are useful when examining small fluctuations in a measurement. The input signal is quickly nulled with the auto-offset function, and resolution is increased by expanding around the relative value by up to 100×. Harmonic detection isn’t limited to 2F — any
harmonic (2F, 3F, ... nF) up to 102 kHz can be measured.

Analog Inputs and Outputs
Both instruments have a user-defined output for measuring X, R, X-noise, Aux 1, Aux 2, or the ratio of the input signal to an external voltage. The SR830 has a second, user-defined output that measures Y, θ, Y-noise, Aux 3, Aux 4 or ratio. The SR81 and SR830 both have X and Y analog outputs (rear panel) that are updated at 256 kHz. Four auxiliary inputs (16-bit ADCs) are provided for general purpose use — like normalizing the input to source intensity fluctuations. Four programmable outputs (16-bit DACs) provide voltages from –10.5 V to +10.5 V and are settable via the front panel or computer interfaces.

Internal Memory
The SR810 has an 8,000 point memory buffer for recording the time history of a measurement at rates up to 512 samples/s. The SR830 has two, 16k point buffers to simultaneously record two measurements. Data is transferred from the buffers using the computer interfaces. A trigger input is also provided to externally synchronize data recording.

Easy Operation
The SR810 and SR830 are simple to use. All functions are set from the front-panel keypad, and a spin knob is provided to quickly adjust parameters. Up to nine different instrument configurations can be stored in non-volatile RAM for fast and easy instrument setup. Standard RS-232 and GPIB (IEEE- 488.2) interfaces allow communication with computers.

· 1 mHz to 102.4 kHz frequency range
· >100 dB dynamic reserve
· 5 ppm/°C stability
· 0.01 degree phase resolution
· Time constants from 10 μs to 30 ks
(up to 24 dB/oct rolloff)
· Auto-gain, -phase, -reserve and -offset
· Synthesized reference source
· GPIB and RS-232 interfaces

Ordering Information
SR830       DSP dual phase lock-in $4950
                  amplifier (w/ rack mount)
SR810       DSP single phase lock-in $4150
                    amplifier (w/ rack mount)
SR550       Voltage preamplifier $750
                    (100 MΩ, 3.6 nV/√Hz)
SR552       Voltage preamplifier $750
                    (100 kΩ, 1.4 nV/√Hz)
SR554       Transformer preamplifier $1200
                    (0.091 nV/√Hz)
SR555       Current preamplifier $1095
SR556       Current preamplifier $1095
SR540       Optical chopper

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