37.500 Hz is geen "geluid"; het is ultrasoon. Mensen kunnen dat niet horen, ook niet onder water. Dolfijnen en walvissen kunnen die hoge frequenties wel horen.quote:
Die precieze 25 ZB 101 OL ligt op een platform op "slechts" 4300-4800 meter diepte. Naar het noordwesten ("terug" van de pinglijn) wordt het pas echt diep met 5200+...quote:
quote:Question: Just to clarify just what you were talking about then, the two detections in the area; so the boat picked up something, then came back and found the second one in a separate area, is that correct—two kilometres away? Is that what you were saying? And further, just can you expand on the Ocean Shield, what it [indistinct].
Angus Houston: The first detection was about, 36 hours ago, not last night, the night before. And I believe it was just a quick acoustic detection and then nothing. The Haixun Zero One stayed in the area investigating the site at which this had occurred. And yesterday afternoon, Perth time, there was another acoustic detection. That was less than two kilometres from the original detection. Now the fact that we have two detections, they are slightly apart in terms of distance, but in an ocean that size, two kilometres is not a large distance. And of course, they are separated in time over a period of 24 hours. The second transmission was—or should I say acoustic event, was for about 90 seconds. So we obviously have to investigate it fully and we will do that, and we will let you know at the completion of the process what the outcome is. I mean, we are not going to hide anything from any of you.
kleine updates in probable flight pathquote:Question: Can you describe the other event that Ocean Shield is investigating?
Peter Leavy: This is only happened within the last 90 minutes. We heard a report back from Ocean Shield, from the towed ping locator operators on board there, that they had picked up a detection. It is very, very early days and the note of caution that Air Chief Marshall Houston mentioned before I would reiterate, they are still investigating that. We are not yet sure whether she'll be tasked to remain there, if it's promising she will, to investigate that particular emission—or detection. If it's not, then I expect she will be re-tasked down towards the Haixun Zero One position. I would imagine it would take most of today to actually resolve that location up where Ocean Shield's position is.
As you can appreciate, she has 6000 metres of tow behind her, so to turn around and go back over an area of water again, it takes quite some time for the ship to physically reverse course. So I wouldn't expect until mid afternoon at the absolute earliest as decision on whether she will relocate.
quote:Today, the international investigative team has this morning advised of a correction to the satellite data that has been used to calculate the probable flight path of MH370. The correction arises from new information about the state of the satellite itself when it received transmissions from MH370 during its flight. The effects of the correction is to raise the priority for searching the southern component of the existing search area ahead of the northern component.
Transcript of press conference, 6 Aprilquote:Question: One more thing, you were talking about a satellite discrepancy earlier. Does that satellite discrepancy, am I right in thinking you were talking about going back to the southern ocean with those searches, to the original area, or in the area of the Chinese vessel?
Angus Houston: No, the search area doesn't change at all, but what we get out of the data, the satellite—this is the Inmarsat satellite, the characteristics of that were such that on reanalysing the data that has been obtained, some other conclusions have come up which slightly change the possible profile of the aeroplane. And they are based on the fact that there might be a slight difference in the air speed that has been calculated. And we're talking programs the aircraft—perhaps the aircraft went a little bit faster than had originally been calculated on the basis of analysing the satellite data.
Question: So it would be further north.
Angus Houston: It would be a little bit further south. And that's why we are going into the southern part of the area rather than the northern part. The search area doesn't change, so it's not a big change, not the sort of changes we had early in the operation, but the area of highest probability, we think, is now probably in the southern part of the area, pretty close to where Haixun Zero One is operating. And that's why we are so very interested in the two acoustic encounters that Haixun Zero One has had.
de blackbox zo programmeren dat hij dezelfde tonen als een dolfijnen roep uitzend! hoef je alleen maar te zoeken naar een grote groep dolfijnenquote:
Ik las ergens dat andere/modernere blackboxes op het hoorbare 8800 Hz uitzonden, maar dat deze Boeing dat natuurlijk weer net niet had...quote:
Maakt toch geen drol uit of het voor mensen hoorbaar is, als de meter maar uitslaat wanneer je de microfoon in het water steekt?quote:
in dit geval "maakt het geen drol uit", nee, maar stel dat het redelijk in de buurt van een duikplek op zeg de Malediven was gebeurd...?quote:
Klinkt interessant. Post eens dat artikel, mata.quote:
jaaa, ik houd niet alles bij in een archief ofzo.quote:
Dat weet je toch helemaal niet??quote:
Nee, post dat gelijk alle ACI's, want theoretisch kunnen ze er allemaal mee te maken hebben. Hoe zorgt een defect in het IRS voor een failure van communicatie en transponder?quote:
Kortsluitingen, brandjes, andere mankementen...quote:
Is, voor zover ik weet, niet zo. Groot nadeel van hoorbare signalen is, naast en hoger batterij verbruik ook een flink verminderd bereik..quote:
Nou ja, het is mogelijk dat de CVR en de FDR zover van elkaar verwijderd liggen, maar ook weer hoogst onwaarschijnlijk, beide hebben een identieke pinger.quote:
Als die 3.2 km signaalrange juist is dan klopt er iets niet met het verhaal dat de 2 schepen die het signaal oppikten 400km van elkaar verwijderd waren.quote:
Nou, ik dacht dat het zoekgebied iets van 900km breed was.quote:
Word vandaag vervolgt:quote:Op zondag 6 april 2014 19:28 schreef Unstoppable het volgende:
Even wat directe quotes uit de persconferentie, voor het volledige beeld:
3 mogelijke signalen opgepikt
kleine updates in probable flight path
Transcript of press conference, 6 April
Volledig transcript van persconferentie+beantwoordde vragen
Haixun Zero One was wel een beetje buiten zijn aangewezen zoekgebied aan het zoeken gister, dat werd tenminste gesuggereerd door een paar journalisten
http://www.telegraph.co.u(...)ines-plane-live.htmlquote:Angus Houston, who is co-ordinating the multinational search, said Australia’s Ocean Shield, said two signals were picked up that “sound just like an emergency locator beacon” and are believed to have been emitted from a pinger attached to the plane’s black box. Here is his statement:
Well, good afternoon. Yesterday I outlined a number of leads we were pursuing in relation to the search, the missing Malaysian Airlines Flight MH370. Namely, the electronic pulse signals detected by the Chinese ship Haixun 01 and an acoustic noise being pursued by the Australian defense vessel Ocean Shield in her current location. I stated that the Ocean Shield would be delayed from going to the approximate area where the Haixun 01 had detected the signals while she continued her own investigations.
Today I can report some very encouraging information which has unfolded over the last 24 hours. The towed pinger locator deployed from the Australian defense vessel Ocean Shield has detected signals consistent with those emitted by aircraft black boxes.
Two separate signal detections have occurred within the northern part of the defined search area. The first detection was held for approximately 2 hours and 20 minutes. The ship then lost contact before conducting a turn and attempting to re-acquire the signal.
The second detection on the return leg was held for approximately 13 minutes. On this occasion, two distinct pinger returns were audible. Significantly, this would be consistent with transmissions from both the flight data recorder and the cockpit voice recorder.
Clearly, this is a most promising lead. And probably in the search so far, it's probably the best information that we have had.
Again, I would ask all of you to treat this information cautiously and responsibly until such time as we can provide an unequivocal determination. We haven't found the aircraft yet; we need the confirmation. And I really stress this; it's very important.
Ocean Shield remains in the immediate area and continues to try and regain contact with the towed pinger locator. To this point, it has not been able to re-acquire the signals.
There are many steps yet before these detections can be positively verified as being from missing Flight MH370.
Firstly, we need to fix the position. Then the Ocean Shield can lower the autonomous underwater vehicle 'Bluefin 21' into the water and attempt to locate wreckage on the sea floor. Another source of evidence such as wreckage would verify this lead. The area in which the signals have been received has a depth of approximately 4,500 meters (15,000 feet). This is also the limit of capability of the autonomous underwater vehicle.
I need to be honest with you. It could take some days before the information is available to establish whether these detections can be confirmed as being from MH370.
In very deep oceanic water, nothing happens fast. Of course, I will update you once we have an unequivocal determination.