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Views: 0 Author: Site Editor Publish Time: 2025-09-23 Origin: Site
Tunnels push into unknown ground. Crews worry about hidden water. We bring a simple image: a flashlight for geology. A pulse goes out, a response comes back, bright zones pop into view. Transient Electromagnetics, or TEM, delivers that kind of preview. YCS2000A handles this job fast. It resists noise. It keeps a short blind zone under ten meters. It scans lines in a tight shift window. We pair it to KJ117(A) for continuous monitoring and alerts. One tool scouts, one tool guards the gate.
We keep the tone plain. We keep steps short. We include tables, mini charts, and a printable checklist. Crews can run a sweep in one shift. Leaders get a clear risk map before drilling.
A coil sends a current pulse into rock. Induced currents decay over time. Conductive zones keep energy longer. Curves stay "bright" at late times. We plot that decay by time gates. We color strong, medium, weak. Eyes pick patterns in seconds.
ASCII sketch:
We then stack this view on a simple profile. A "beam" points forward from the face. Bright segments outline targets for caution.
Beam idea:
Near faults or fracture belts
Karst suspects, possible cavities
Roof or floor aquifer uncertainty
Old workings close by, unclear extent
Rapid advance across mixed lithology
Wet season starts, first major storm on radar
After layout change, before crews push again
A simple rule: risk unclear, schedule tight, drilling expensive → run a TEM sweep first, then drill to confirm.
Strong anti‑interference design. Motors growl, yet data holds shape.
Low sensitivity to nearby metal frames compared to older gear.
Blind zone shorter than ten meters, so faces can act early.
Fast acquisition. Crews finish a practical line before lunch.
Compact logistics. One case for coils, one for power, one for cables.
We then pass anomalies to KJ117(A) teams. They watch curves and alerts during advance. Two systems, one rhythm.
Use this five‑block flow. Print it on a card.
| Block | Goal | Actions | Outputs |
|---|---|---|---|
| Plan | Cover risk zones | Pick line geometry and spacing, set target depth and gate plan, book a quiet window | Line map, parameter sheet |
| Acquire | High SNR | Set Tx current, choose early/mid/late gates, pick stack count, avoid noisy periods | Raw records, field log |
| QC | Stable, repeatable curves | Repeat key stations, run a null test, add remote‑ref if needed | QC report, keep/reject marks |
| Quick‑look | Fast triage | Compute apparent responses, render a 1D/2D quick panel, flag strong bands | Risk bands: high/med/low |
| Decide | Clear next moves | Mark pilot holes, adjust route or pace, raise monitoring density | Decision memo, action list |
Notes for crews:
Tx current: push high, stay inside safety rules.
Gate design: earlier gates target shallow features, later gates probe deeper.
Stacks: add count when noise rises, keep pace in mind.
Tune numbers per geology and safety policy. Use this table as a starting point.
| Target depth | Tx current | Gate start | Gate end | Stacks | Notes |
|---|---|---|---|---|---|
| 0–50 m | Medium‑high | Early | Mid | 16–32 | Rapid sweep near face |
| 50–120 m | High | Early | Late | 32–64 | General use case |
| >120 m | High | Mid | Late | 64–128 | Patience over speed |
Coil layout tips:
Keep a smooth loop. Kinks add noise.
Step away from heavy power racks by a few meters.
Mark station offsets on the floor for clean repeats.
Quality makes or breaks a sweep. Add five minutes for QC, save hours later.
Repeat test: run a second pass over three stations. Curves should overlap closely.
Null test: lift the receive loop or rotate it ninety degrees. Signal should collapse.
Remote reference: place a small sensor outside the noise zone. Use it for noise rejection if a site hums.
Timing sanity: confirm gate timing using the console clock.
Field notes: note any pump switch, fan change, radio burst.
QC table:
| Check | Target | Pass cue | What to store |
|---|---|---|---|
| Repeat | Curve stability | Overlap inside 5–10% | Two plots, same scale |
| Null | Geometry sanity | Amplitude drops near zero | Photo of coil pose |
| Remote‑ref | Noise cut | Lower variance, cleaner late gates | Paired records |
| Timing | Gate control | Gates match plan | Console screenshot |
| Field note | Event context | Time tags for pumps/fans | Log page photo |
Use color bands for a quick triage. Then write one line per band.
| Band | Signal look | Likely meaning | First move |
|---|---|---|---|
| High | Late‑time curve stays strong, footprint wide | Conductive body, possible water‑bearing zone, or conductive fill | Slow pace, run a pilot hole, add monitoring points |
| Medium | Mid‑time bump, late‑time fades | Moderately conductive zone, partial saturation, thin feature | Proof hole or short validation pass |
| Low | Early‑time only, then fast decay | Background rock, low risk | Proceed under normal pace, keep routine checks |
Mini profile sketch:
We treat TEM as a scout. We treat KJ117(A) as a guard post. The hand‑off looks like this:
TEM flags a high band near the next twenty meters.
KJ117(A) team tightens thresholds for nearby points.
Mobile alerts get a night bias.
Pump room runs a readiness check.
Crew drills a pilot hole at the center of the band.
Data and cuttings confirm or downgrade risk.
Route shifts if needed. Pace adjusts. Monitoring density increases for two weeks.
Keep clear line routes. Avoid trip hazards.
Respect LOTO during any power move near coils.
Stage cones around coil areas.
Bring spare ties, chalk, a small tarp for wet ground.
Hydrate crews. Short breaks keep focus strong.
Photograph each coil setup. Future repeats get easier.
A heading in a mixed sandstone–coal sequence moved toward a zone of sparse records. The team booked two hours for a YCS2000A sweep. A line ran across the face, then a short offset line for confirmation. Early gates looked plain. Mid and late gates lit up across a twenty‑meter stretch. A bright belt sat slightly to the north side.
The plan changed. The route shifted six meters toward competent sandstone. Pace slowed for one day. A pilot hole cut through minor fractures first, then hit a wet set near the original path. Pumps stood ready. KJ117(A) alerts jumped once during the probe, then settled. The crew kept course on the new line. No flooding, no drama, just a calm week of steady advance.
□ Line map printed, station marks ready
□ Tx current set per depth goal
□ Gate plan loaded: early, mid, late
□ Stacks set for site noise level
□ Coil loop laid smooth, no kinks
□ Power sources kept a few meters away
□ Repeat test done (3 stations)
□ Null test done (lift or rotate)
□ Remote‑ref placed if site hums
□ Field notes capture pump or fan events
□ Quick‑look panel rendered on site
□ Risk bands labeled: high / medium / low
□ Decision memo drafted: route / pace / pilot holes
□ KJ117(A) thresholds tightened near flagged zones
□ Mobile alert test for on‑duty group → 100% ack
□ Pilot hole plan approved by shift lead
□ Photos and raw files saved to cloud and local drive
Decay shapes:
Event logic:
1. Does heavy metal around the face kill data?
Not always. Smart layout reduces coupling. QC steps clean late gates.
2. Can TEM replace drilling?
No. It guides drilling. Proof holes confirm.
3. How long for one line?
Many crews finish a practical fifty‑meter line in under one hour. Terrain and noise set the pace.
4. How often to scan?
Start of wet season, before long pushes, after major layout changes.
5. What about salt water?
High salinity often gives stronger signals. Fresh water still leaves a pattern you can track.
6. Can we run scans during production hours?
Yes in many cases. Noisy windows reduce depth. A quiet hour gives better late gates.
A quick‑look panel for the line, color bands by risk.
A short memo: where to slow, where to drill, where to add sensors.
A list of parameter settings for repeatability.
A QC page: repeats, null test, remote‑ref notes.
A ZIP of raw files, a CSV of decay curves per station.
Delivery table:
| Item | Format | Use |
|---|---|---|
| Risk panel | PNG/PDF | Toolbox talk, route decision |
| Memo | DOC/PDF | Approvals, shift brief |
| Params | CSV | Exact repeat later |
| QC page | Audit trail | |
| Raw data | ZIP | Reprocessing, external review |
Earlier warning by ten to twenty minutes during approaches to risky ground.
Fewer route changes mid‑shift.
Pilot holes succeed more often at finding the real target.
Lower false‑positive count during rainy weeks.
Less downtime for pump surprises.
Higher confidence scores from shift leads in weekly reviews.
TEM gives a scout's eye. YCS2000A makes it fast and robust. KJ117(A) then watches trends during every meter of advance. Crews get a clear picture, managers get a clear plan. We gain minutes before water shows up. We avoid drama at the pump room. We keep progress steady.
