NASA scientists scientists are building the next generation ChemCam with upgrades and brand new spectral capabilities for the NASA Mars 2020 rover.
As the NASA Curiosity rover roams the surface of Mars, its ChemCam captures the chemical makeup of its surroundings with a specially designed laser system. It is the most powerful laser to operate on the surface of another planet. The burst of infrared light it fires lasts only a few billionths of seconds, but it is powerful enough to vaporize the spot it hits at more than 8,000°C. Even from a distance, the ChemCam can examines rocks and soil using a process called Laser Induced Breakdown Spectroscopy (LIBS), where laser bursts atomize and excite components and spectral images capture their chemical signatures.
Here on Earth, scientists are already building the next generation’s ChemCam with impressive upgrades and brand new spectral capabilities for the NASA Mars 2020 rover, named for the year of its scheduled launch. In addition to a faster LIBS system, the SuperCam will feature an entirely new conduction-cooled laser system to provide the non-destructive analysis ability of Raman spectroscopy, capable of detecting carbon-based signatures of organic materials.
Together with the Centre National d’Etudes Spatiales (CNES) and The Research Institute in Astrophysics and Planetology (IRAP), Thales Group is in the final stages of testing the compact SuperCam system that will eventually endure harsh Martian conditions. They have already built and tested a full, representative model.
Unlike Curiosity’s LIBS-only functionality, this new instrument will be able to switch between a LIBS mode and a Raman mode of lasing, a method that requires two different laser colors to excite and probe molecular vibration energies for its non-destructive chemical identification. The second color is produced by a crystal that doubles the 1064 nanometer frequency used for LIBS measurements – which now produces 10 times as many shots in each burst of the laser for faster sampling.
This second, 532 nanometer beam will allow Mars 2020 to detect molecular structures evident of organic matter — evidence of past life. The new optical architecture required to produce the two operation modes, however, was not without its challenges.
The upgraded LIBS oscillator uses a diode pumped Nd:YAG crystal, as opposed to ChemCam’s Nd:KGW, which provides the longer bursts but requires new methods to ensure functionality over a large temperature range. Because the Nd:YAG absorbs over a narrow range of frequencies to lase at a given temperature, the SuperCam uses a multicolor stacked diode that can pump with a wide spectrum to account for a range in temperatures.
“This laser is running in burst mode, but with this laser we can do 1000 shots in one burst while the ChemCam laser was 10 time less,” said Eric Durand, one of SuperCam’s developers at Thales Group, France. “We longitudinally pump this laser with a stack which is a broadband emitting so that when the temperature is changing, the ND:YAG crystal is still absorbing the light and the laser can be used over at least 50 to 60 degrees without temperature regulation.”
Adding another complication to temperature control, the KTP crystal producing the green, frequency doubled light required additional stabilization.
“The most difficult aspect was to achieve the temperature range also with the green wavelength because we have to keep the efficiency over the whole range, and it was only possible by heating a little the KTP crystal,” said Durand.
The temperature stabilization required to keep the system aligned and working for either mode is difficult enough to achieve in a lab, but this system was designed to have the same stability while on the rover as it traverses the rocky Martian terrain. Moreover, it has to meet tight size and weight restrictions that come with space travel and stay free of contaminants that would destroy its components – a feat achieved by sealing the instrument with laser-welding.
The robust and powerful abilities of the new SuperCam will be an invaluable chemical probe for the Mars 2020 rover and may just bring to life a whole host of new findings back to us here on Earth.
As selfie cameras rise, so must selfie etiquette
Selfies were once a sign of narcissism or self-obsession. Now they are the new normal, writes ARTHUR GOLDSTUCK.
You can blame Oxford Dictionaries for making the “selfie” respectable. After all, being named Word of the Year, as it was in 2013, does tend to soften some of the self-consciousness in this most self-conscious of actions.
Once seen as a symbol of narcissism and self-obsession, it is now the new normal, to the extent that most smartphones are sold on the basis of the front camera. Or, as that feature is now almost universally named by manufacturers, the “selfie camera”.
I was one of the hold-outs, having a near-allergy to the selfie. I still resist, but succumb more often than I would like. The reason for continued resistance is that it remains a big leap from the word becoming respectable to the action itself shedding its narcissistic image.
For most, it’s already happened, and for that you can blame Ellen DeGeneres. She choreographed the most famous group selfie yet at the 2014 Oscars, when she roped a bunch of actors into a group selfie, using the then-new Samsung Galaxy S5 smartphone. Her tweet of the photo became what was then the most retweeted posting ever on Twitter, and was estimated to have been worth a million dollars in marketing value to Samsung.
Ironically, it was Samsung’s up-and-coming challenger, Huawei, that came up with a new word for this type of selfie: the “groufie”. Thanks to an 8 Megapixel front camera on the new Huawei Ascend P7 camera that year which took the highest quality selfies – and groufies – possible on a smartphone at the time.
It didn’t end there, and selfies and groufies have morphed into variations like selfscapes (selfie in a landscape), skyfies (selfies from the air, using remote controlled devices) and jerkies (selfies to make an idiot out of yourself). I invented all of those on the fly, so it’s easy to imagine a new word emerging for every type of selfie.
Continue reading about selfie improvements through the years.
Mickey’s 90th for SA
Disney Africa announced the local launch of the Mickey the True Original campaign, joining the global festivities honouring 9 decades of Mickey Mouse, his heritage, personality and status as a pop-culture icon.
As 18 November 2018 marks 90 years since his first appearance in Steamboat Willie in November 1928, a series of world-wide celebrations will be taking place this year and South Africa is no different.
The campaign will come to life with engaging content and events that embrace Mickey’s impact on the past, present and future. The local festivities kick off in earnest this month, leading up to Mickey’s 90th anniversary on 18 November 2018 and beyond:
- An exclusive local design project where ten highly talented South African artists will apply their own inspiration and artistic interpretation on 6-foot Mickey Mouse statues.
- Once revealed to the public, the statues will form part of the Mickey the True Original South African Exhibition, inspired by Mickey’s status as a ‘true original’ and his global impact on popular culture. The exhibition will travel to 3 cities and delight fans and families alike as they journey with Mickey over the years. Featuring 4 sections highlighting Mickey’s innovation, his evolution, influence on fashion and also pop culture, the exhibition is in collaboration with Samsung and Edgars, and will visit:
o Sandton City, Centre Court: 28 September – 14 October
o Gateway Theatre of Shopping, Expo Explore Court: 19 October – 11 November
o Canal Walk Shopping Centre. Centre Court: 16 November – 26 November
- Samsung continues their collaboration with Disney as they honour Mickey’s 90th anniversary nationally at all Samsung and Edgars Stores. Entitled Unlocking the Imagination, fans are encouraged to visit these stores, take a selfie with a giant Mickey plush toy using their Samsung Galaxy Note9 and stand a chance to win not only a giant Mickey plush, but also an international family trip. Visit www.Samsung.com for more information
- Mickey’s 90th Spectacular, a two-hour prime-time special, will be screened on M-Net 101 later this year. The elegant affair will feature star-studded musical performances, moving tributes and never-before-seen short films. Superstars from music, film and television will join the birthday fun for the internationally beloved character.
- In addition, look out for special programming on Mickey’s birthday (18 November) across Disney Channel (DStv, Channel 303), Disney XD (DStv, Channel 304) and Disney Junior (DStv, Channel 309).
- In retailers, Edgars will be stocking a complete collection of trendy fashion, accessories and footwear for the whole family, inspired entirely by Mickey Mouse.
- Mickey will be the central theme of an in-store campaign nationwide this November and December, with brand new products, apparel, toys, as well as titles from Disney Publishing Worldwide, including books, arts & crafts and comics
- Discovery Vitality and Disney are celebrating healthy, happy families this festive season by offering helpful and exciting tips and tricks on how to eat nutritious, yet delicious, foods, all inspired by Mickey. There’s also a trip to Disneyland Paris up for grabs. Log on to www.discovery.co.za/vitality for information.
- And much more – check the press for updates
“Binding generations together more than any other animated character, Mickey Mouse is the “True Original” who reminds people of all ages of the benefits of laughter, optimism and hope,” says Christine Service, Senior Vice President and Country Manager of The Walt Disney Company Africa. “With his universal appeal and ability to emotionally connect with generations all over the world, no other character quite occupies a similar space in the hearts and minds of a global fan base and we are thrilled to be sharing these local festivities.”
Mickey’s birthday is celebrated in honour of the release of his first theatrical film, Steamboat Willie, on 18th November 1928, at the Colony Theatre in New York City. Since then, he has starred in more than 100 cartoons and can currently be seen on Disney Channel (DStv, Channel 303) in the Mickey Mouse cartoon series and on Disney Junior (DStv, Channel 309) in Mickey and the Roadster Racers.
South African fans are encouraged to share their Mickey Mouse moments on social media using the hashtag#Mickey90Africa.