单点激光测振仪厂家1.2原理：
Julight 公司的激光测振仪是基于新颖的自混频干涉结构而成的，可以对粗糙发散的表面（比如未抛光的金属，塑料，橡皮，纸质，纤维等）进行极易而精确的非接触振动测量。激光测振仪提供模拟的电信号输出，这些电信号就是在某一频率的目标位移的复制品（ 1mv/um响应率，对应 1mm/V）。频率范围从DC到50KHZ,甚至到10MHZ ,zui小的可测位移为0.4nm (1HZ噪声宽带)，zui大的振动幅值（峰峰值）可以大于20mm,zui大的速率可以使1 m/s .
Julight公司的激光测振仪的zui显著的特点就是具有非常小的光学头：
-标准光学头，带斑点追踪功能（大小：105mm x 60mm x 40mm)，有定焦和自动对焦两个版本。
-可选的超小的光学头，不带斑点追踪和自动对焦功能（大小：长50 mm,直径 15mm）
处理干涉信号的简单二有效的电子系统可以做得和精致，一台 VSM400(或 VSM4000)仪器能够支持4个光学头（也就是说4个独立的光学通道），因此，这样的话，就可以进行同时测量不同点的振动，而无需使用扫描系统来完成。
单点激光测振仪厂家系列产品参数比较表
| Description | VSM1000 | VSM4000 | VSM1000-L | VSM1000-L-EXT | VSM3D |
| Maximum measurable vibration (peak-to-peak) | 43 mm (theoretical) 1 mm (practical) | 43 mm (theoretical) 1 mm (practical) | 43 mm (theoretical) 1 mm (practical) | 43 mm (theoretical) 1 mm (practical) (0-50KHZ) 4 um(practical) (20KHZ-3MHZ) | 43 mm (theoretical) 1mm (practical) |
| Maximum measurable velocity | > 0.5 m/s | > 0.5m/s | 0.5 m/s @ 0.5 m 0.2 m/s @ 5.0 m | 0-50KHZ: 0.5 m/s @ 0.5 m 0.2 m/s @ 5.0 m 20KHZ-3MHZ: 40ms/s | 0.5 m/s |
| Output signals | · Displacement / Velocity(analog, BNC connector) · Monitor (3.5mm jack): - Optical Signal Level (analog) | · Displacement/ Velocity (analog, BNC connector) · Monitor (3.5mm jack): - Optical Signal Level (analog) | · Displacement / Velocity(analog, BNC connector) · Monitor (3.5mm jack): - Optical Signal Level (analog) | · Displacement / Velocity(analog, BNC connector) · Monitor (3.5mm jack): - Optical Signal Level (analog) | · X, Y, Z Displacement (analog, 3x BNC connectors) · Monitor (3.5mm jack): - Optical Signal Level (analog) |
| Output signal responsivity | · Displacement: 0.5 V/mm ·Velocity: 5 V/(m/s) | · Displacement: 0.5 mV/mm ·Velocity: 5 V/(m/s) | · Displacement: 0.5 V/mm ·Velocity: 5 V/(m/s) | 0-50KHZ: · Displacement: 0.5 V/mm ·Velocity: 5 V/(m/s) 20KHZ-3MHZ: 5V/um | · Displacement: 0.5 V/mm |
| Resolution | Noise-limited | Noise-limited | Noise-limited | Noise-limited | Noise-limited |
| Noise Equivalent Displacement | 0.2 nm/ÖHz (from DC to 50 kHz) | 0.2 nm/ÖHz (from DC to 50 kHz) | 0.2 nm/ÖHz @ 0.5 m 1 nm/ÖHz @ 5.0 m | 0.2 nm/ÖHz @ 0.5 m 1 nm/ÖHz @ 5.0 m | 0.2 nm/ÖHz (from DC to 50 kHz) To 10M HZ |
| Output signal accuracy | 1% | 1% | 1% | 0-50KHZ: 1% 20KHZ-3MHZ: 5% | 1% |
| Spatial transversal resolution | 100 mm | 100 mm | 100 mm | 100 mm | 100 mm |
| Target surface | Diffusive or back-reflecting | Diffusive or back-reflecting | Diffusive or back-reflecting | Diffusive or back-reflecting | Diffusive or back-reflecting |
| Working distance | · From 20 to 120 cm (Auto Focus mode) · 20, 40 and 100 cm (Fixed Focus mode) | · From 20 to 120 cm(Auto Focus mode) · 20, 40 and 100 cm (Fixed Focus mode) | · From 0.5 to 5.0 m(Auto Focus mode) · 0.5, 1.0 and 5.0 m (Fixed Focus mode) | · From 0.5 to 5.0 m(Auto Focus mode) · 0.5, 1.0 and 5.0 m (Fixed Focus mode) | · 15 cm (accurate positioning assisted by LED bar indicator) |
| Laser radiation | · Pout < 1 mW @ 650 nm (collimated) | · Pout < 1 mW @ 650 nm (collimated) | · Pout < 1 mW @ 650 nm (collimated) | · Pout < 1 mW @ 650 nm (collimated) | · Pout < 1 mW @ 650 nm (collimated) |
| Laser safety class | · Class 2 @ 650 nm (visible) | · Class 2 (visible) @ 650 nm | · Class 2 @ 650 nm (visible) | · Class 2 @ 650 nm (visible) | · Class 2 @ 650 nm (visible) |
| Optical head | 50 mm x 70 mm x 105 mm | 50 mm x 70 mm x 105 mm | 50 mm x 70 mm x 105 mm | 50 mm x 70 mm x 105 mm | 155 mm x 145 mm x 80 mm |
| Electronic unit dimensions | 12.5 cm x 15.5 cm x 29.6 cm | 24.6 cm x 15.5 cm x 29.6 cm | 12.5 cm x 15.5 cm x 29.6 cm | 12.5 cm x 15.5 cm x 29.6 cm | 24.6 cm x 15.5 cm x 29.6 cm |
| Optical head cable length | 2.5 m (5 m optional) | 2.5 m (5 m optional) | 2.5 m (5 m optional) | 2.5 m (5 m optional) | 2 m (5 m optional) |
| Power supply | · 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz | · 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz | · 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz | · 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz | · 110-120 VAC / 60 Hz · 220-240 VAC / 50 Hz |
| Power consumption | < 5 W | < 5 W per channel (max 20 W) | < 5 W | < 5 W | < 15 W |
| I/O | RS485 serial port | RS485 serial port | RS485 serial port | RS485 serial port | RS485 serial port |
| Weight | 4 kg | 4¸6 kg | 4 kg | 4 kg | 6 kg |
| Temperature (operating) | Optical head: -20°C to +80°C (-4°F to +176°F) Main unit: | Optical head: -20°C to +80°C (-4°F to +176°F) Main unit: | Optical head: -20°C to +80°C (-4°F to +176°F) Main unit: | Optical head: -20°C to +80°C (-4°F to +176°F) Main unit: | Optical head: 0°C to +80°C (+32°F to +176°F) Main unit: |
注意：以上型号工作距离和频率范围可以根据客户需求定制拓展，工作距离：1.2米，5米，
10米，20米，30米甚至更远。频率可以拓展到：3MHZ和10MHZ 。
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