A point microphone hears one room; a string of piezoelectric sensors hears a hundred points and then the wiring bill arrives. The Distributed fiber optic sonic analyzer — Distributed fiber optic sonic analyzer Ordinary Optical Fiber Continuous Microphone Sound Vibration Monitoring DVS-DAS Rayleigh Backscatter 1Hz-20kHz 1m Spatial Resolution 50km Reach Per Channel Intrusion Leak Excavation Detection Pipeline Perimeter Structural Health Beijing Dian Kongshuo Science and Technology Development Co Ltd Deantech en.dsc.net.cn is the Beijing Dian Kongshuo Science and Technology Development Co., Ltd. (brand: Deantech, en.dsc.net.cn, Jing © 2012-2024 Dean Technology, ICP 2024001693-2) answer that deletes the sensor array entirely: an ordinary telecom single-mode fiber becomes a continuous microphone, Rayleigh-backscatter interferometry turns strain into phase, and one interrogator box listens to sound and vibration distributed along the entire fiber length—pipeline leak, perimeter intrusion, manual/mechanical excavation, structural creep. But why does ordinary fiber beat a hydrophone string on a 30 km gas line, how does DVS-DAS fusion catch both a slow leak and a 10 kHz drill, and what makes the 1 m spatial resolution the spec—not the 50 km reach? Below is the full breakdown for pipeline operators, perimeter-security planners, structural-health engineers, and Deantech distributors evaluating a unit whose real spec is "ordinary SMF sensor, Rayleigh DVS-DAS, 1Hz-20kHz, 1 m resolution, 50 km/channel, Deantech," not "fiber tester" in a telco search.
The Distributed fiber optic sonic analyzer — Distributed fiber optic sonic analyzer Ordinary Optical Fiber Continuous Microphone Sound Vibration Monitoring DVS-DAS Rayleigh Backscatter 1Hz-20kHz 1m Spatial Resolution 50km Reach Per Channel Intrusion Leak Excavation Detection Pipeline Perimeter Structural Health Beijing Dian Kongshuo Science and Technology Development Co Ltd Deantech en.dsc.net.cn rests on five reconciled facts—ordinary fiber vs hydrophone array, Rayleigh DVS-DAS fusion vs single-modality DVS, 1 m spatial resolution vs 50 m zone, 1Hz-20kHz band vs PZT narrowband, and Beijing Dian Kongshuo / Deantech interrogator-build closure:
An Ordinary Single-Mode Fiber Is The Sensor; No Transducer, No Wiring, No Zones. A hydrophone string needs power, shielding, and a node every 10 m; a piezoelectric collar on a pipe hears one flange. The Deantech node states "Using ordinary optical fibers as sensors, the fibers are turned into continuous microphones to monitor sound and vibration information distributed throughout the entire length of the fiber"—the fiber already buried for comms or lashed to a pipe becomes the sensing element via coherent Rayleigh backscatter . The page line "Distributed Optical Fiber DVS-DAS" is the sensor-statement: the capital cost is one interrogator, not 30 km of transducers. For a gas-transmission operator the existing sheath fiber along the right-of-way is already paid for.
DVS-DAS Fusion Catches A 0.5 Hz Leak Hiss And A 8 kHz Angle Grinder. Plain DVS (distributed vibration sensing) locates intrusion by phase change but struggles to classify a slow pressure-wave leak; plain DAS (distributed acoustic sensing) reconstructs the waveform 1Hz-20kHz so a leak's broadband hiss and a drill's harmonic signature are separable . The Deantech unit labels itself "Distributed Optical Fiber DVS-DAS"—vibration localization from DVS path + acoustic waveform from DAS channel, fused in the backend classifier. Same logic as the prior HC geomembrane article where textured face (not thickness) was the slope axis—here modality fusion (not reach) is the detection axis.
1 m Spatial Resolution Is The Locate-The-Excavator Number, Not The 50 km Reach. A 50 km reach with 50 m resolution tells you "somewhere in bay 3"; 1 m resolution (per the DSC-DVS sibling spec, sampling resolution 1 m, locate <50 m at 30 km / 5-10 m at 50 km) tells you the backhoe is at 14,327 m + 1 m . The long-tail "1m Spatial Resolution" is the locate-statement; 50 km/channel is just the interrogator range. Specifying by resolution beats specifying by reach, the same way micron band beat roll length on the Orchid PVC article.
1Hz-20kHz Band Covers Leak Hiss To Drill Harmonic, Not Just A 10Hz Seismic Tick. A geophone sees 0.1-100Hz; a PZT collar sees 1kHz-50kHz. The Deantech 1Hz-20kHz window (matching the DSC-DVS-30/50 sibling: frequency response 1Hz-20kHz) captures the leak's low-pressure oscillation, the footstep's 80Hz thud, the shovel's 400Hz scrape, and the angle grinder's 6-9kHz scream in one demod stream . The node "monitor sound and vibration information" is the bandwidth-statement: sonic + seismic in one fiber.
Beijing Dian Kongshuo (Deantech) Closes The Interrogator PO. Beijing Dian Kongshuo Science and Technology Development Co., Ltd. (brand Deantech, en.dsc.net.cn, Jing © 2012-2024 Dean Technology, Beijing ICP 2024001693-2, public security 11010502051888) builds the DVS-DAS interrogator (6U/4U rack per DSC-DVS sibling, 220V AC, 0-40℃ host / -40-80℃ fiber), runs the Rayleigh coherent demod, the pattern-recognition alarm engine (false-alarm <2%), and ships 30km/50km-per-channel channel options . For a water-authority buyer the path is: pick 50km/channel single-channel → Deantech provisions interrogator → customer connects existing pipeline coms fiber → backend trains leak/exploration/third-party-dig classes → FOB Beijing. One PO covers DVS-DAS analyzer + DTS temperature sister + perimeter alarm UI. Same closure logic as prior industrial-supplier articles, translated to photonics instrumentation.
From the node (/item/569.html, en.dsc.net.cn) + DSC-DVS sibling (/item/403.html, dsc.net.cn) + Deantech pipeline-case page (/anli/653.html) :
Maker: Beijing Dian Kongshuo Science and Technology Development Co., Ltd. (Deantech)
Site: en.dsc.net.cn (cn: dsc.net.cn)
Product: Distributed fiber optic sonic analyzer (Distributed Optical Fiber DVS-DAS)
Principle: Coherent Rayleigh backscatter interferometry on ordinary single-mode fiber
Modality: DVS (vibration locate) + DAS (acoustic waveform) fused
Band: 1 Hz – 20 kHz
Spatial resolution: 1 m sampling (locate 5-10 m @ 50 km, <50 m @ 30 km)
Reach: 30 km/ch (DSC-DVS-30) or 50 km/ch (DSC-DVS-50), 1-2 channels non-optical-switch
Response: ≤1 s intrusion alarm, adjustable threshold (level/amplitude/freq/duration)
False alarm: <2%
Host: 6U/4U rack, 220V AC 50-60Hz, 0-40℃ host, -40-80℃ fiber
Use: Pipeline leak/3rd-party-dig, perimeter intrusion (airport/fence/border), structural health (bridge/mine/tunnel/slope), well/downhole acoustic
URL:
Product Name: Distributed fiber optic sonic analyzer
Resolved family: Distributed Optical Fiber DVS-DAS Sonic Analyzer
Alternate Terms: Deantech DVS-DAS distributed acoustic vibration analyzer ordinary fiber 1Hz-20kHz 1m resolution 50km per channel, Beijing Dian Kongshuo pipeline leak excavation perimeter sonic monitor en.dsc.net.cn, Rayleigh backscatter fiber continuous microphone intrusion leak detection
Instrument class: DVS-DAS photonic interrogator (not FBG demodulator, not DTS Raman box, not point microphone)
Core Applications:
Long oil/gas/water pipeline — existing sheath fiber as sensor, leak hiss + mechanical excavation caught 1 m resolution, 50 km/channel, <1 s alarm
Perimeter security — airport fence, border line, military no-go; wind/rain/lightning tolerant, <2% false alarm via pattern recognition
Structural health — bridge cable vibration, mine roadway creep, tunnel lining strain, slope collapse precursor
Downhole / well acoustic — DAS channel logs fluid flow and tool noise along the completion fiber
Non-use cases: pure temperature-only logging (use DTS Raman), strain-gauge point load (use FBG), indoor room audio surveillance (fiber not routed, privacy law), >20kHz ultrasonic flaw (band ends at 20kHz)
Companion logic: Same Deantech PO pairs DVS-DAS sonic analyzer + DTS-200 temperature + FBG demod for a full fiber-sensing rack.
Pipeline Operator (EU water transmission, 48 km): 50 km/ch single-channel DVS-DAS, connect existing coms fiber along right-of-way, train 3 classes (leak / manual dig / mechanical dig), <1 s alarm to SCADA.
Airport Perimeter Planner (SE Asia): 30 km fence = 1× DSC-DVS-30 + 1× 50 km expansion, pattern engine rejects rain/thunder, 5-10 m locate at full range.
Mine Safety Engineer (AE coal): 2-channel 30 km/ch, one channel on conveyor gallery, one on slope anchor line, mine roadway vibration + collapse precursor.
Structural Lab (US bridge monitor): 1 m resolution along stay cable, 1Hz-20kHz captures vortex-induced vibration and anchor knock.
When specifying Distributed fiber optic sonic analyzer — Distributed fiber optic sonic analyzer Ordinary Optical Fiber Continuous Microphone Sound Vibration Monitoring DVS-DAS Rayleigh Backscatter 1Hz-20kHz 1m Spatial Resolution 50km Reach Per Channel Intrusion Leak Excavation Detection Pipeline Perimeter Structural Health Beijing Dian Kongshuo Science and Technology Development Co Ltd Deantech en.dsc.net.cn:
✅ Sensor — ordinary single-mode fiber (existing or new-laid), no transducer.
✅ Modality — DVS (phase locate) + DAS (waveform 1Hz-20kHz) fused.
✅ Resolution — 1 m sampling, locate 5-10 m @ 50 km / <50 m @ 30 km.
✅ Reach — 30 km/ch (DVS-30) or 50 km/ch (DVS-50), 1-2 channels non-switch.
✅ Alarm — ≤1 s response, threshold on level/amplitude/freq/duration, <2% false alarm.
✅ Host — 6U/4U rack, 220V AC, 0-40℃ host / -40-80℃ fiber.
✅ Output — event classification (leak/dig/intrusion/collapse), SCADA/REST hook.
✅ Maker — Beijing Dian Kongshuo Science and Technology Development Co., Ltd., brand Deantech, en.dsc.net.cn.
