Vibrating-Wire Sensors & Acquisition振弦传感器与采集系统
A one-stop stress-monitoring solution: six vibrating-wire sensor families plus an intelligent frequency-sweep acquisition system that also reads most other vendors' VW sensors — from foundation-pit struts to dam cores. 一站式应力监测解决方案：六大振弦传感器系列 + 智能扫频采集系统，并可直接接入大多数厂家的振弦传感器——从基坑支撑到大坝坝体。
Frequency-based sensing that stays stable for decades 以频率为信号，数十年长期稳定
Vibrating-wire sensing converts stress, strain and pressure into the resonant frequency of a tensioned steel wire — a signal immune to cable-length attenuation, resistant to electromagnetic interference and nearly drift-free over years. That is why it remains the de-facto standard for permanently embedded monitoring of foundation-pit supports, tunnel linings, dam bodies and bridge pile foundations. 振弦测量将应力、应变与压力转化为张紧钢弦的自振频率——频率信号不受线缆长度衰减影响、抗电磁干扰、多年漂移极小。因此振弦至今仍是基坑支护、隧道衬砌、大坝坝体、桥梁桩基等永久埋入式监测的事实标准。
- ✓Engineered for permanent embedment为永久埋设而生
Frequency output is unaffected by long cables and EMI; long-term drift stays below 0.1% FS per year.频率输出不受长线缆与电磁干扰影响，长期漂移低于每年 0.1%FS。
- ✓Synchronized temperature compensation温度同步补偿
Every sensor carries a built-in thermistor sampled together with frequency, stripping thermal effects out of the stress reading.传感器内置热敏电阻，与频率同步采集，将温度影响从应力读数中剥离。
- ✓One family, every stress parameter一个系列覆盖全部应力参数
Rebar stress, surface and embedded strain, anchor-cable load, earth pressure and pore water pressure — all on one acquisition system.钢筋应力、表面与埋入式应变、锚索受力、土压力与孔隙水压力——同一套采集系统全部覆盖。
How a Steel Wire Measures Stress一根钢弦如何测出应力
A steel wire 0.15–0.20 mm thick and 100–150 mm long is tensioned between two end blocks fixed to the structure. Its resonant frequency follows f = (1/2L)·√(T/ρ): wire tension is proportional to f², so any strain in the member shifts the frequency — a principle in continuous dam-monitoring service since the 1930s.一根直径 0.15–0.20mm、长 100–150mm 的钢弦张紧固定在与结构相连的两个端块之间。其自振频率满足 f = (1/2L)·√(T/ρ)：弦的张力与 f² 成正比，构件应变随之改变频率——这一原理自 1930 年代起持续应用于大坝监测至今。
Pluck, Then Listen先激励 · 后聆听
The coil fires a 1–5 kHz frequency-sweep pulse to set the wire ringing, then switches to receive mode. The ring-down at the wire's resonant frequency induces a 1–10 mV signal from which frequency is extracted by zero-crossing counting or FFT.线圈先发出 1–5kHz 扫频脉冲激发钢弦振动，随后切换为接收模式。钢弦在自振频率上的余振感应出 1–10mV 信号，经过零计数或 FFT 提取频率。
Frequency, Not Voltage传频率 · 不传电压
Because the measurand is a frequency rather than an analog voltage, the signal is immune to long-cable attenuation and electromagnetic interference — the physical reason VW sensors survive decades of permanent embedment in concrete.被测量是频率而非模拟电压，信号不受长线缆衰减与电磁干扰影响——这正是振弦传感器可在混凝土中永久埋设数十年的物理原因。
Temperature, Stripped Out温度影响 · 同步剥离
A 10 °C swing can bias an uncompensated stress reading by 5–10%. The built-in NTC thermistor (typ. 10 kΩ at 25 °C) is sampled synchronously with frequency, and the k_T term in the formula strips the thermal effect out.10℃ 温差可使未补偿的应力读数偏差 5–10%。内置 NTC 热敏电阻（典型 10kΩ@25℃）与频率同步采样，公式中的 k_T 项将温度影响剥离。
Inside the piezometer, the same wire sits behind a stainless-steel diaphragm: water pressure deflects the diaphragm by a few micrometres, a push rod converts that into wire tension, and pressure follows P = G·(f² − f₀²) + Δ_T·(T − T₀) — a two-stage mechanical amplification that underpins its decade-scale stability. 在渗压计内部，同样的钢弦位于不锈钢膜片之后：水压使膜片产生几微米挠度，经传力杆转化为钢弦张力变化，压力满足 P = G·(f² − f₀²) + Δ_T·(T − T₀)——这种"二阶机械放大"结构是其十年尺度长期稳定的基础。
Six Families, One-Stop Stress Monitoring六大系列 · 一站式应力监测
From rebar stress to pore water pressure, the vibrating-wire family covers the stress-monitoring needs of nearly every geotechnical structure.从钢筋应力到孔隙水压力，振弦系列覆盖几乎所有岩土工程结构的应力监测需求。
Rebar Stressmeter钢筋计
Monitors rebar stress on the vibrating-wire principle — welded in line with the reinforcement before casting.基于振弦原理监测钢筋应力，浇筑前与钢筋串联焊接安装。
Surface Strain Gauge表面应变计
Mounts directly on the structure surface to measure strain on existing concrete and steel members.直接安装于结构表面，测量既有混凝土与钢结构构件的应变。
Concrete Stressmeter混凝土应力计
Embedded during casting to track long-term stress changes inside concrete members and mass-concrete structures.随浇筑埋设于混凝土内部，长期监测构件与大体积混凝土的应力变化。
Anchor-Cable Load Cell锚索测力计
High-range design monitors the load on anchor cables and rock bolts in slope and excavation support systems.高量程设计，监测边坡与基坑支护体系中锚索、锚杆的受力。
Earth Pressure Cell土压力计
Diaphragm sensing measures soil pressure against retaining structures and within embankment fills.薄膜式传感，测量作用于围护结构及填筑体内部的土压力。
Piezometer渗压计
Pore-water-pressure monitoring with a 0–4 MPa range; the diaphragm-plus-wire stage delivers 0.025% FS resolution.孔隙水压力监测，量程 0–4MPa；膜片 + 振弦二阶结构实现 0.025%FS 分辨率。
RFRS Series: The Hub Between Sensors and CloudRFRS 系列：连接传感器与云平台的枢纽
Three configurations — RFRS1260 (16-ch), RFRS1240 (8-ch) and RFRS1220 (4-ch) — digitize vibrating-wire signals and hand them to the data gateway and cloud platform. A handheld re-survey unit (RFRS1210) covers manual on-site verification.提供三种规格——RFRS1260（16 通道）、RFRS1240（8 通道）、RFRS1220（4 通道），将振弦信号数字化后经数据网关上行云平台；另有手持式复测仪 RFRS1210 用于现场人工校核。
- ✓Intelligent frequency-sweep智能扫频
Automatically matches each sensor's resonant frequency — a clear advantage on long cables and in strong electromagnetic interference.自动匹配传感器自振频率，在长线缆与强电磁干扰环境下优势尤为明显。
- ✓High-voltage excitation高压激励
Programmable high-voltage excitation keeps signals stable and reliable, even with slowly degrading sensor coils.可编程高压激励让信号更稳定可靠，即使传感器线圈出现慢性老化也能从容应对。
- ✓Plug-and-play, multi-vendor compatible即插即用 · 多厂家兼容
Auto-detects sensor type and reads coils from 50 Ω to 10 kΩ — most vendors' VW sensors connect with no replacement needed.自动识别传感器类型，可读取 50Ω–10kΩ 线圈——大多数厂家的振弦传感器无需更换即可接入。
- ✓Built-in temperature channel内置温度采集通道
Thermistor channels sample synchronously with frequency for accurate temperature compensation.热敏电阻通道与频率同步采样，实现精确的温度补偿。
From Wire to Cloud in Four Hops从钢弦到云端 · 四级架构
1 · VW Sensor1 · 振弦传感器
Stress, strain or pressure changes the steel wire's resonant frequency.应力、应变或压力改变钢弦的自振频率。
2 · Acquisition Module2 · 采集模块
Sweep-excites the wire, reads the ring-down and digitizes frequency plus temperature.扫频激励钢弦，读取余振，将频率与温度数字化。
3 · Data Gateway3 · 数据网关
Uplinks over 4G / RS485 with local buffering against network loss.通过 4G / RS485 上行，断网时本地缓存续传。
4 · Cloud Platform4 · 云平台
Rasber Monitoring Cloud handles curves, tiered alerts and reports.瑞茨柏监测云完成曲线、分级预警与报表。
Acquisition Module Specifications采集模块技术规格
| Parameter参数 | RFRS1220 (4-Channel)RFRS1220（4 通道） | RFRS1260 (16-Channel)RFRS1260（16 通道） |
|---|---|---|
| Frequency range频率测量范围 | 1000–5000 Hz | 1000–5000 Hz |
| Excitation激励方式 | Programmable high-voltage可编程高压激励 | Programmable high-voltage + programmable & intelligent frequency-sweep可编程高压激励 + 可编程扫频 + 智能扫频 |
| Sensor auto-ID传感器自动识别 | Coils 50 Ω – 10 kΩ线圈 50Ω–10kΩ | Coils 50 Ω – 10 kΩ线圈 50Ω–10kΩ |
| Temperature element温度检测元件 | Thermistor (customizable)热敏电阻（可定制） | Thermistor (customizable)热敏电阻（可定制） |
| Uplink上行接口 | 4G / RS485 | 4G / RS485 |
| Power supply供电 | Built-in 8.4 V lithium battery内置 8.4V 锂电池 | 9–24 V solar / mains9~24V 太阳能 / 市电 |
| Operating temperature工作温度 | -20 ~ 60 ℃ | -20 ~ 70 ℃ |
Embedment & Field Practice埋设规程与现场实践
Sensor accuracy and installation accuracy are two different things: a piezometer leaves the factory at 0.025% FS, but an unsaturated filter or a mis-recorded depth can put 5–10% of error into the data. These field rules close that gap.传感器精度与安装精度是两回事：渗压计出厂精度 0.025%FS，但透水头不饱和或深度记错，数据偏差可达 5–10%。以下现场规程就是为堵住这个缺口。
- 1Saturate the filter under water — at least 24 h透水头水下饱和——不少于 24 小时
A piezometer's porous filter is never lowered dry. Residual air bubbles bias long-term readings low by 5–10%, and no later calibration can recover it.渗压计透水头严禁干态下井。气泡残留会使长期读数偏低 5–10%，且事后无法通过校准修回。
- 2Two gates before concrete embedment埋入混凝土前的两道门禁
A 48-hour burn-in plus independent verification with a frequency meter. Once the concrete is poured there is no second chance.48 小时老化测试 + 频率计独立验证。混凝土浇筑之后没有再来一次的机会。
- 3Record the actual depth to 0.1 m实际安装深度记录到 0.1m
The installed depth must match the design documents — a wrong depth record is the hardest error to trace in later data back-analysis.安装深度必须与设计文件对得上——深度记错是后期数据反演中最难追查的误差来源。
- 4Seal the borehole above the sensor传感器上方封孔
Sand or bentonite sealing prevents water from connecting across layers; without it, the measuring point loses its layer-specific meaning.用砂或膨润土密封，避免上下层水互串；不封孔，监测点就失去分层意义。
- 5Choose gauge vs. absolute correctly表压式 / 绝对式选对
Vented (gauge) types for water-level work — atmospheric pressure is removed automatically; absolute types for sealed, confined water pressure. The wrong choice makes the data oscillate with the weather.水位类监测选表压式（自动扣除大气压）；承压水等密闭水压选绝对式。选错会让数据跟着天气一起波动。
Already Own Another Vendor's VW Sensors?已有其他厂家的振弦传感器？
Rasber acquisition terminals use an open protocol and identify any vibrating-wire sensor with a coil resistance from 50 Ω to 10 kΩ — covering Geokon, Sisgeo, Roctest, Maihak and mainstream domestic brands. Existing sensors connect to the Rasber Monitoring Cloud without replacement.瑞茨柏振弦采集终端采用开放协议，可识别线圈电阻 50Ω–10kΩ 的任意振弦传感器——覆盖 Geokon、Sisgeo、Roctest、Maihak 及国内主流厂家。客户既有传感器无需更换即可接入瑞茨柏监测云。
Lost Contact After Embedment? Don't Break Concrete First埋入后失联？先别拆混凝土
The field triage order: switch to intelligent frequency-sweep, step the excitation voltage level, verify independently with a frequency meter — and only then consider physical access. Intelligent sweep often recovers sensors with slowly degrading coils.现场排查顺序：先切智能扫频，再调激励电压档位，再用频率计独立验证，最后才考虑拆装。智能扫频常能恢复线圈慢性老化的传感器。
Automated Water Level Monitoring System自动化水位监测系统
Two sensing principles: pressure-sensitive RWLGS020/030 at 0.5% FS accuracy, and vibrating-wire RWLGS120 for long-term stable monitoring — covering foundation-pit, reservoir and groundwater levels.两种测量原理：压敏式 RWLGS020/030（精度 0.5%FS）与振弦式 RWLGS120（更适合长期稳定监测）——覆盖基坑水位、水库水位与地下水位监测。
- ✓Integrated design, no trenching一体化设计 · 无需开槽布线
The all-in-one unit drops straight into the standpipe — no trenching or surface wiring required.一体机直接放入水位管即可完成安装，无需开槽与地面布线。
- ✓Automatic temperature compensation自动温度补偿
Built-in compensation keeps readings accurate through seasonal and day-night temperature swings.内置温度自动补偿，季节与昼夜温差下保持读数准确。
- ✓RS485 + 3-month battery lifeRS485 + 3 个月以上续航
Standard RS485 communication interface with over three months of operation per charge.标准 RS485 通信接口，单次充电续航超过 3 个月。
- ✓Part of a complete pit-safety system构成完整基坑安全监测体系
Pairs with inclinometers and VW sensors to assess dewatering, detect leakage and track groundwater trends.与测斜仪、振弦传感器配合，评估基坑降水效果、检测渗漏、分析地下水位趋势。
Frequently Asked Questions常见问题
Can Rasber loggers read vibrating-wire sensors from other vendors?瑞茨柏采集器能接其他厂家的振弦传感器吗？
Do long signal cables degrade the reading?信号线缆很长会影响读数吗？
Why does temperature compensation matter so much?温度补偿为什么这么重要？
The channel reads zero frequency, or the frequency is unstable — what do I check?通道频率为 0 或频率不稳，先查什么？
Our piezometer reads consistently low after installation. Why?渗压计安装后读数持续偏低，为什么？
Why does our pore-pressure data move with the weather?为什么渗压数据跟着天气波动？
From Order to Long-Term O&M从下单到长期运维
Every unit ships with factory QC reports, and accuracy is traceable through third-party metrology institute calibration.每台设备随附出厂质检报告，精度可通过第三方计量机构校准溯源。
Standard products ship from stock; fast response on customization.标准产品现货发出，定制需求快速响应。
On-site installation guidance and partner enablement training.现场安装指导与合作伙伴赋能培训。
Backed by full-lifecycle technical service across four phases.四阶段全生命周期技术服务保障。
Cloud-hosted O&M, remote device-status monitoring and periodic reports.云端托管运维、设备状态远程监控与定期报告。
Works Best as Part of a System组合成系统，监测更完整
In-Place Inclinometer固定式测斜仪
The deep foundation-pit combination: in-place inclinometers track deep horizontal displacement of the retaining structure alongside VW stress sensors.深基坑监测组合：固定式测斜仪监测围护结构深层水平位移，与振弦传感器配合使用。
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Settlement Monitoring沉降监测
Hydrostatic level gauges add the vertical-deformation dimension to the stress picture painted by VW sensors.静力水准仪为振弦应力监测补上竖向变形维度。
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DAQ & Cloud Platform采集与云平台
The RFRS1260 acquires VW signals and hands them to the Rasber Monitoring Cloud for curves, tiered alerts and reports.RFRS1260 采集振弦信号并接入瑞茨柏监测云，完成曲线、分级预警与报表。
Learn more了解详情 →Need specs, pricing or a demo?需要详细规格、报价或演示？
Our engineers respond with datasheets, calibration records and a sensor-plus-acquisition configuration matched to your structure type and channel count.我们的工程师将提供数据手册、标定记录，并根据您的结构类型与通道数量定制传感器与采集配置方案。