Det er ikke bare oss hifi-nuts....

[Asbjørn]

...som går på limpinnen ved å kjøpe overprisede dingsbomser med magiske egenskaper, men som merkelig nok ikke tåler kontakt med ingeniørfaglige eller vitenskapelige metoder. Denne gangen gjelder det dingser som selges som "bombedetektorer", og som brukes til å scanne forbipasserende etter eksplosiver. En manglende deteksjon fører til at folk dør i et selvmordsangrep, en falsk alarm til at uskyldige behandles som potensielle selvmordsbombere. Det er noe kjent ved modus operandi i en del av disse tilfellene:

The promotional material issued by ATSC claims that the ADE 651 can detect items including guns, ammunition, drugs, truffles, human bodies, contraband ivory and bank notes at distances of up to 1 kilometre (0.62 mi), underground, through walls, underwater or even from airplanes at an altitude of up to 5 kilometres (3.1 mi). The device is said to work on the principle of "electrostatic magnetic ion attraction".[7] According to the promotional material, "by programming the detection cards to specifically target a particular substance, (through the proprietary process of electro-static matching of the ionic charge and structure of the substance), the ADE651 will “by-pass” all known attempts to conceal the target substance. It has been claimed to penetrate lead, other metals, concrete, and other matter (including hiding in the body) used in attempts to block the attraction."[8] Prosec, a Lebanese reseller of the ADE 651, claims on its website that the device "works on nuclear quadrupole resonance (NQR) or nuclear magnetic resonance (NMR)."
[...]
The BBC's Newsnight programme investigated the ADE 651 in a report broadcast in January 2010, asking the University of Cambridge Computer Laboratory to assess one of the "programmed substance detection cards" used in the device to detect TNT. The laboratory found that the card contained only a standard radio frequency security tag of the type used in stores to prevent shoplifting. According to the laboratory's Dr. Markus Kuhn, it was "impossible" for the card to detect anything and it had "absolutely nothing to do with the detection of TNT". The card could not be programmed, had no memory, no microprocessor and no form of information could be stored on it. Despite the high cost of the devices, the cards were worth only about two to three pence (3–5¢) each. Kuhn commented: "These are the cheapest bit of electronics that you can get that look vaguely electronic and are sufficiently flat to fit inside a card." The "card reader" was found to be an empty plastic box.
[...]
A US Army test of a similar device found that it was unable to detect a truck carrying a tonne of TNT when it drove up behind the operator.[12] In June 2009, the US Army carried out a laboratory test including X-ray analysis on the ADE 651 that found it to be inffective. According to Major Joe Scrocca, "The examination resulted in a determination that there was no possible means by which the ADE 651 could detect explosives and therefore was determined to be totally ineffective and fraudulent.

Promotional material issued about the GT200 claims that it can detect a wide variety of items including ammunition, explosives, drugs, gold, ivory, currency, tobacco and "human bodies" at ranges of up to 700 metres (2,300 ft) on the surface, depths of up to 60 metres (200 ft) underground or under 800 metres (2,600 ft) of water, or even from aircraft at an altitude of up to 4 kilometres (2.5 mi). A "Substance Sensor Card" inserted into the device is said to create an "attracting field" utilising "dia/para magnetism" between the device and the substance that is to be detected. The field is claimed to make the antenna of the GT200 lock onto a signal, indicating the direction in which the substance can be located.[9] According to the promotional material, if the device is used correctly, it "can detect substance(s) through walls, (even lead-lined and metal ones), water, (fresh and salted), fresh and frozen food, (fish, fruit, tea, coffee, ice), vacuum flask, containers, petrol and diesel fuel and even buried in the earth" and can detect narcotics for up to two weeks after they have been ingested by a target individual.
[...]
A BBC Newsnight investigation of the GT200 in January 2010 found that the "sensor card" contained merely two sheets of card between which was sandwiched a sheet of paper, white on one side and black on the other, that had been cut off from a larger sheet with a knife or scissors. It contained no electronic components whatsoever. When the device's case was dismantled, it too was found to contain no electronic components. Explosives expert Sidney Alford told Newsnight: "Speaking as a professional, I would say that is an empty plastic case." Gary Bolton of Global Technical said that the lack of any electronic parts "does not mean it does not operate to the specification."[17]
A GT200 unit was examined on Thailand's Nation Channel in an interview with Lt Col Somchai Chalermsuksan of the Thai Central Institute of Forensic Science. The host commented that "there is no battery here or way of powering it" and that the bottom half of the device was completely empty. Asked if there was anything in the sealed top half of the device, Lt Col Somchai said: "There is nothing. Once there was an accident and the device came apart. There was nothing inside." The host concluded: "So it is just two pieces of plastic put together."
[...]
Numerous people were killed and injured in two bomb attacks in October 2009 in which the GT200 was used by security forces. On 6 October 2009, a car bomb exploded opposite the Merlin Hotel in Sungai Kolok, killing one person and injuring 20, after it had been "scanned" using a GT200 and declared to be free of explosives. A motorcycle bomb exploded on 19 October in Yala, injuring another 26 people, again after a scan with a GT200 had returned negative results for explosives.
[...]
Hundreds are said to have been detained by Thai security forces on the basis of GT200 readings.[8] According to Human Rights Watch, about 10% of those detained on suspicion of involvement in the insurgency have been arrested on this basis.[39] In one village in Narathiwat province, 32 people were arrested after GT200s were used to "detect" traces of explosive substances on their bodies.[40] Most of them were detained without charge for an extended period. Brad Adams of Human Rights Watch commented: "It is common during security sweeps in the south to see Muslim men lined up on the roadside with their shirts off while being screened by a GT200. Many of those implicated by the GT200 have been arrested and then tortured."
[...]
Army Spokesperson Sansern Kaewkamnerd insisted that the GT200 units worked with 100% confidence and that the Army was ready to prove the units' effectiveness any time, any where.[49] Pornthip Rojanasunand, Director of the Central Institute of Forensic Science, also defended the use of the GT200 devices, claiming that they were effective when searching for bombs and even nails under water. She said: "I do not feel embarrassed if the bomb detector is proven ineffective. Personally, I have never handled the device myself. But my people have used it and it is accurate every time. Long long time ago, people believed that the Earth is flat and anyone who said otherwise faced execution. Things which are not visible does not necessarily mean they do not exist. The devices are there and no one has the right to ban their use. I will continue to use it."

An article in The Dallas Morning News in April 2007 suggested that Sniffex is a divining rod and states that "In a test by the U.S. Navy, Sniffex didn't register when two trucks passed within 20 feet, hauling a half ton of explosives. The Navy's counterterrorism technology task force tested Sniffex and concluded "The Sniffex handheld explosives detector does not work."[2] Despite this, the military bought eight for $50,000.[2]
Although high performance is claimed in advertising for Sniffex, such claims have not been verified by objective double blind testing.[3] Although the tests were conducted at a public meeting [4] by the president of the company, Sniffex did not detect test explosives when the user did not know in advance where they were located. Additionally, James Randi publicly called into question the validity of Sniffex and exchanged correspondence with the CEO offering one million dollars if Sniffex can do what the press releases claim."

http://en.wikipedia.org/wiki/ADE_651
http://en.wikipedia.org/wiki/GT200
http://en.wikipedia.org/wiki/SNIFFEX
http://en.wikipedia.org/wiki/Quadro_Tracker

http://sniffexquestions.blogspot.com/
http://technology.timesonline.co.uk/tol/news/tech_and_web/article6935574.ece

Bortsett fra at innsatsen er betydelig høyere, både i pengebeløp og konsekvenser, kunne man vært hensatt til en tweak-debatt i hifi-kretser. Man påberoper seg funksjonalitet som strider mot enhver logisk virkemåte, gjerne innpakket i pseudo-kvantefysisk mumbo-jumbo, lar seg ikke vippe av pinnen om noen påviser at apparatet bare er en tom boks, og de som har kjøpt dingsbomsen påstår minst like hardnakket som produsenten at den virker hver gang.

Har noen tweakologer skiftet bransje fra hifi til noe som betaler enda bedre?

 

[vredensgnag]

Jeg leste fort gjennom og så ikke ordet Quantum nevnt.
Det er derfor det ikke virker.

 

[Asbjørn]

<Klasker håndflaten mot pannebrasken med et lydelig klask>

Ja, selvsagt, sånn må det være! "Nuclear quadrupole resonance" låter ikke riktig like fint, gjør det vel?

 

[Vidar P]

Å, den virker vel supert etterhvert. De har nok bare glemt å kryobehandle den og brenne den inn.

 

[Anonym]

Er avhengig av at 5 terrorister med TNT går gjennom før den er innbrent.

 

[Asbjørn]

Kanskje det, men du kan heller ikke forvente at sånne sarte ting som dette skal fungere hvis brukeren er stresset i lytteprøvesituasjonen:

Deputy Interior Minister Thaworn Senneam told journalists after a fatal bomb attack in Southern Thailand on 6 October 2009 that the police had failed to detect the bomb "because the officer handling the GT200 detector was too nervous... His nervousness caused his temperature to rise which, in turn, caused the bomb detector to malfunction." He announced that in future two officers would be assigned to use the device, with the second ready to take over from the first if he was "not ready to use it."[44]

 

[Roberten]

Kanskje det, men du kan heller ikke forvente at sånne sarte ting som dette skal fungere hvis brukeren er stresset i lytteprøvesituasjonen:

Deputy Interior Minister Thaworn Senneam told journalists after a fatal bomb attack in Southern Thailand on 6 October 2009 that the police had failed to detect the bomb "because the officer handling the GT200 detector was too nervous... His nervousness caused his temperature to rise which, in turn, caused the bomb detector to malfunction." He announced that in future two officers would be assigned to use the device, with the second ready to take over from the first if he was "not ready to use it."[44]

Sometimes truth is stranger than fiction. Tydeligvis.

 

[duality]

old news... har postet denne filmen før, skal se om jeg finner filmen..
Sykt at folk tror på dette.. det er jo bevist at det er bullshit for leeenge siden..

(samme prinsippet.)

 

[vredensgnag]

Vi kan vel, som vanlig,, regne med at det er flere som har hatt stort utbytte av innkjøp av disse detektorene, som er konstruert av piperensere og brukte spillkort, såvidt jeg kan forstå, men som er solgt for store beløp. Så mange mellommenn har interesse av å late som om de virker.

Og da er det selvsagt operatørfeil som har skylden, det kan aldri være slik at det er innkjøper som er et naut. Kanskje de skal bruke disse resonnanskoppene, om ikke annet blir det fin bass i eksplosjonene når det først smeller.

 

[Asbjørn]

According to an Army commander, which makes extensive use of the device, how well it works "depends on the static electricity stored in the body of its user. If the person using the detector is feeling weak physically, his static electricity will be down and weaken the effectiveness of the device."

Following media criticism, Army chief General Anupong Paochinda accused the press of working for Asia Satcom's competitors. He organized a demonstration to "prove" to the media that the devices worked. 4th Army chief Lt. General Pichet Wisaijorn told the press, "It is not Gen Anupong saying the device is effective. Officers in the South and the North and the current and former 4th Army commanders also say the same thing. We have bought them and if the users insist they are good, that's end of the discussion."

 

[FatmanFlump]

Gjeeesp.....